Provided by: libnetcdf-dev_4.6.1-3_amd64 bug

NAME

       netcdf - Unidata's Network Common Data Form (netCDF) library interface

SYNOPSIS

       #include "netcdf.h"

       cc ...  -lnetcdf -lhdf5_hl -lhdf5 -lz -lm

       Complete  documentation  for  the  netCDF  libraries  can  be found at the netCDF website:
       http://www.unidata.ucar.edu/software/netcdf/.

LIBRARY VERSION

       This document describes versions 3 and 4 of Unidata netCDF data-access interface for the C
       programming language.

       const char* nc_inq_libvers()

              Returns  a  string  identifying  the version of the netCDF library, and when it was
              built, like: "3.1a of Aug 22 1996 12:57:47 $".

       The RCS ident(1) command will find a string like "$Id: @(#) netcdf library version 3.1a of
       Sep   6  1996 15:56:26 $" in the library. The SCCS what(1) command will find a string like
       "netcdf library version 3.1a of Aug 23 1996 16:07:40 $".

RETURN VALUES

       All netCDF functions (except nc_inq_libvers() and nc_strerror()) return an integer status.

       If this returned status value is not equal to NC_NOERR (zero), it indicates that an  error
       occurred.  The  possible status values are defined in system include file <errno.h> and in
       "netcdf.h".

       const char* nc_strerror(int status)

              Returns a string textual translation  of  the  status  value,  like  "Attribute  or
              variable name contains illegal characters" or "No such file or directory".

FILE OPERATIONS

       int nc_create(const char path[], int cmode, int* ncid)

              Creates  a new netCDF dataset at path, returning a netCDF ID in ncid.  The argument
              cmode may include the bitwise-or of the following flags:  NC_NOCLOBBER  to  protect
              existing  datasets  (default  silently  blows  them away), NC_SHARE for synchronous
              dataset updates for classic format files (default is to buffer accesses),

              When a netCDF dataset is created, is is opened NC_WRITE.  The new netCDF dataset is
              in define mode.  NC_64BIT_OFFSET.  to create a file in the 64-bit offset format (as
              opposed to classic format, the default).  NC_TRUE to create a  netCDF-4/HDF5  file,
              and  NC_CLASSIC_MODEL  to guarantee that netCDF-4/HDF5 files maintain compatibility
              with the netCDF classic data model.

       int nc__create(const char path[], int cmode, size_t initialsize, size_t*  chunksize,  int*
              ncid)

              Like nc_create() but has additional performance tuning parameters.

              The argument initialsize sets the initial size of the file at creation time.

              See nc__open() below for an explanation of the chunksize parameter.

       int nc_open(const char path[], int mode, int* ncid)

              (Corresponds to ncopen() in version 2)

              Opens a existing netCDF dataset at path returning a netCDF ID in ncid.  The type of
              access is described by the mode parameter, which may include the bitwise-or of  the
              following  flags:  NC_WRITE for read-write access (default read-only), NC_SHARE for
              synchronous dataset updates (default is to buffer accesses), and NC_LOCK  (not  yet
              implemented).

       int nc__open(const char path[], int mode, size_t* chunksize, int* ncid)

              Like nc_open() but has an additional performance tuning parameter.

              The  argument referenced by chunksize controls a space versus time tradeoff, memory
              allocated in the netcdf library versus number of system calls.  Because of internal
              requirements,  the value may not be set to exactly the value requested.  The actual
              value chosen is returned by reference.  Using the value NC_SIZEHINT_DEFAULT  causes
              the  library to choose a default.  How the system choses the default depends on the
              system.  On many systems, the "preferred I/O block  size"  is  available  from  the
              stat()  system  call,  struct  stat  member st_blksize.  If this is available it is
              used. Lacking that, twice the system pagesize is used.  Lacking a call to  discover
              the system pagesize, we just set default chunksize to 8192.

              The  chunksize  is  a  property of a given open netcdf descriptor ncid, it is not a
              persistent property of the netcdf dataset.

       int nc_redef(int ncid)

              (Corresponds to ncredef() in version 2)

              Puts an open netCDF  dataset  into  define  mode,  so  dimensions,  variables,  and
              attributes can be added or renamed and attributes can be deleted.

       int nc_enddef(int ncid)

              (Corresponds to ncendef() in version 2)

              Takes  an  open  netCDF dataset out of define mode.  The changes made to the netCDF
              dataset while it was in define mode  are  checked  and  committed  to  disk  if  no
              problems  occurred.   Some  data  values  may  be  written  as  well, see "VARIABLE
              PREFILLING" below.  After a successful call, variable data can be read  or  written
              to the dataset.

       int  nc__enddef(int  ncid,  size_t  h_minfree,  size_t  v_align,  size_t v_minfree, size_t
              r_align)

              Like nc_enddef() but has additional performance tuning parameters.

              Caution: this function exposes internals of the netcdf version 1 file  format.   It
              may not be available on future netcdf implementations.

              The  current  netcdf file format has three sections, the "header" section, the data
              section for fixed size variables, and the data section for variables which have  an
              unlimited  dimension (record variables).  The header begins at the beginning of the
              file. The index (offset) of the beginning of the other two sections is contained in
              the  header. Typically, there is no space between the sections. This causes copying
              overhead to accrue if one wishes to change the size of the sections, as may  happen
              when  changing  names of things, text attribute values, adding attributes or adding
              variables. Also, for buffered i/o, there may be advantages to aligning sections  in
              certain ways.

              The  minfree  parameters  allow one to control costs of future calls to nc_redef(),
              nc_enddef() by requesting that minfree  bytes  be  available  at  the  end  of  the
              section.   The h_minfree parameter sets the pad at the end of the "header" section.
              The v_minfree parameter sets the pad at the end of the data section for fixed  size
              variables.

              The  align  parameters  allow  one  to  set  the  alignment of the beginning of the
              corresponding sections. The beginning of the section is  rounded  up  to  an  index
              which is a multiple of the align parameter. The flag value NC_ALIGN_CHUNK tells the
              library to use the chunksize (see above)  as  the  align  parameter.   The  v_align
              parameter  controls  the  alignment  of the beginning of the data section for fixed
              size variables.  The r_align parameter controls the alignment of the  beginning  of
              the   data  section  for  variables  which  have  an  unlimited  dimension  (record
              variables).

              The file format requires mod 4 alignment, so  the  align  parameters  are  silently
              rounded  up  to  multiples  of  4. The usual call, nc_enddef(ncid) is equivalent to
              nc__enddef(ncid, 0, 4, 0, 4).

              The file format does not contain a "record size" value, this is calculated from the
              sizes  of  the  record  variables. This unfortunate fact prevents us from providing
              minfree and alignment control of the "records" in a  netcdf  file.  If  you  add  a
              variable  which has an unlimited dimension, the third section will always be copied
              with the new variable added.

       int nc_sync(int ncid)

              (Corresponds to ncsync() in version 2)

              Unless the NC_SHARE bit is  set  in  nc_open()  or  nc_create(),  accesses  to  the
              underlying  netCDF  dataset are buffered by the library. This function synchronizes
              the state of the underlying dataset and the library.  This is done automatically by
              nc_close() and nc_enddef().

       int nc_abort(int ncid)

              (Corresponds to ncabort() in version 2)

              You  don't  need  to  call this function.  This function is called automatically by
              nc_close() if the netCDF was in define mode  and  something  goes  wrong  with  the
              commit.   If  the  netCDF  dataset  isn't  in  define  mode,  then this function is
              equivalent  to  nc_close().   If  it  is  called  after  nc_redef(),   but   before
              nc_enddef(),  the  new definitions are not committed and the dataset is closed.  If
              it is called after nc_create() but before nc_enddef(), the dataset disappears.

       int nc_close(int ncid)

              (Corresponds to ncclose() in version 2)

              Closes an open netCDF dataset.  If the dataset is in define mode, nc_enddef()  will
              be  called  before closing.  After a dataset is closed, its ID may be reassigned to
              another dataset.

       int nc_inq(int ncid, int* ndims, int* nvars, int* natts, int* unlimdimid)

       int nc_inq_ndims(int ncid, int* ndims)

       int nc_inq_nvars(int ncid, int* nvars)

       int nc_inq_natts(int ncid, int* natts)

       int nc_inq_unlimdim(int ncid, int* unlimdimid)

       int nc_inq_format(int ncid, int* formatn)

              Use these functions to find out what is  in  a  netCDF  dataset.   Upon  successful
              return,  ndims  will  contain   the  number  of  dimensions defined for this netCDF
              dataset, nvars will contain the number of variables, natts will contain the  number
              of  attributes,  and  unlimdimid  will  contain  the  dimension ID of the unlimited
              dimension if one exists, or -1 otherwise.  formatn will contain the version  number
              of   the   dataset  <format>,  one  of  NC_FORMAT_CLASSIC,  NC_FORMAT_64BIT_OFFSET,
              NC_FORMAT_NETCDF4, or NC_FORMAT_NETCDF4_CLASSIC.  If any of the  return  parameters
              is  a NULL pointer, then the corresponding information will not be returned; hence,
              no space need be allocated for it.

       int nc_def_dim(int ncid, const char name[], size_t len, int* dimid)

              (Corresponds to ncdimdef() in version 2)

              Adds a new dimension to an open netCDF dataset, which must be in define mode.  name
              is  the  dimension  name.   If  dimid  is  not  a NULL pointer then upon successful
              completion dimid will contain the dimension ID of the newly created dimension.

USER DEFINED TYPES

       Users many define types for a netCDF-4/HDF5 file (unless  the  NC_CLASSIC_MODEL  was  used
       when  the  file  was  creates).  Users  may define compound types, variable length arrays,
       enumeration types, and opaque types.

       int nc_def_compound(int ncid, size_t size, const char name[], int* typeidp)

              Define a compound type.

       int nc_insert_compound(int ncid, nc_type ,  const  char  name[],  size_t  offset,  nc_type
              field_typeid)

              Insert  an  element into a compound type. May not be done after type has been used,
              or after the type has been written by an enddef.

       int nc_insert_array_compound(int ncid, nc_type , const char name[], size_t offset, nc_type
              field_typeid, int ndims, const int dim_sizes[])

              Insert an array into a compound type.

       int nc_inq_type(int ncid, nc_type , char name[], size_t* sizep)

              Learn about a type.

       int nc_inq_compound(int ncid, nc_type , char name[], size_t* sizep, size_t* nfieldsp)

       int nc_inq_compound_name(int ncid, nc_type , char name[])

       int nc_inq_compound_size(int ncid, nc_type , size_t* sizep)

       int nc_inq_compound_nfields(int ncid, nc_type , size_t* nfieldsp)

       int nc_inq_compound_fieldname(int ncid, nc_type , int fieldid, char name[])

       int nc_inq_compound_fieldindex(int ncid, nc_type , const char name[], int* fieldidp)

       int nc_inq_compound_fieldoffset(int ncid, nc_type , int fieldid, size_t* offsetp)

       int nc_inq_compound_fieldtype(int ncid, nc_type , int fieldid, nc_type* field_typeid)

       int nc_inq_compound_fieldndims(int ncid, nc_type , int fieldid, int* ndims)

       int nc_inq_compound_fielddim_sizes(int ncid, nc_type , int fieldid, int dim_sizes[])

              Learn about a compound type.

       int nc_def_vlen(int ncid, const char name[], nc_type base_typeid, nc_type* xtypep)

              Create a variable length array type.

       int   nc_inq_vlen(int   ncid,   nc_type  ,  char  name[],  size_t*  datum_sizep,  nc_type*
              base_nc_typep)

              Learn about a variable length array type.

       int nc_free_vlen(nc_vlen_t *vl)

              Free memory comsumed by reading data of a variable length array type.

       int nc_put_vlen_element(int ncid, nc_type , void * vlen_element, size_t len, void * data)

              Write one VLEN.

       int nc_get_vlen_element(int ncid, nc_type , void **  vlen_element,  size_t  len,  void  **
              data)

              Read one VLEN.

       int nc_free_string(size_t len, char **data)

              Free memory comsumed by reading data of a string type.

       int  nc_inq_user_type(int ncid, nc_type , char name[], size_t* , nc_type* , size_t* , int*
              )

              Learn about a user define type.

       int nc_def_enum(int ncid, nc_type base_typeid, const char name[], nc_type* typeidp)

              Define an enumeration type.

       int nc_insert_enum(int ncid, nc_type base_typeid, const char name[], const void *value)

              Insert a name-value pair into enumeration type.

       int nc_inq_enum_member(int ncid, nc_type xtype, int idx, char name[], void *value)

       int  nc_inq_enum_ident(int  ncid,  nc_type  xtype,  int  idx,  long   long   value,   char
              identifier[])

              Learn about a name-value pair into enumeration type.

       int nc_def_opaque(int ncid, size_t size, const char name[], nc_type* xtypep)

              Create an opaque type.

       int nc_inq_opaque(int ncid, nc_type xtype, char name[], size_t* sizep)

              Learn about opaque type.

GROUPS

       Users   may  organize  data  into  hierarchical  groups  in  netCDF-4/HDF5  files  (unless
       NC_CLASSIC_MODEL was used when creating the file).

       int nc_inq_grps(int ncid, int* numgrps, int ncids[])

              Learn how many groups (and their ncids) are available from the group represented by
              ncid.

       int nc_inq_grpname(int ncid, char name[])

       int nc_inq_grpname_full(int ncid, size_t* len, char name[])

       int nc_inq_grpname_len(int ncid, size_t* len)

       int nc_inq_grp_parent(int ncid, int* ncid)

       int nc_inq_grp_ncid(int ncid, char name[], int* ncid)

       int nc_inq_full_ncid(int ncid, char name[], int* ncid)

              Learn about a group.

       int nc_inq_varids(int ncid, int* nvars, int* )

              Get the varids in a group.

       int nc_inq_dimids(int ncid, int* ndims, int* dimids, int include_parents)

              Get the dimids in a group and (potentially) its parents.

       int nc_inq_typeids(int ncid, int* ntypes, int typeids[])

              Get the typeids of user-defined types in a group.

       int nc_def_grp(int ncid, char name[], int* ncid)

              Create a group.

DIMENSIONS

       int nc_inq_dimid(int ncid, const char name[], int* dimid)

              (Corresponds to ncdimid() in version 2)

              Given a dimension name, returns the ID of a netCDF dimension in dimid.

       int nc_inq_dim(int ncid, int dimid, char name[], size_t* len)

       int nc_inq_dimname(int ncid, int dimid, char name[])

       int nc_inq_dimlen(int ncid, int dimid, size_t* len)

              Use  these functions to find out about a dimension.  If either the name argument or
              len argument is a NULL  pointer,  then  the  associated  information  will  not  be
              returned.   Otherwise,  name  should  be   big  enough  (NC_MAX_NAME)  to  hold the
              dimension name as the name will be copied into your  storage.   The  length  return
              parameter,  len  will  contain  the  size  of  the  dimension.   For  the unlimited
              dimension, the returned length is the current maximum value used for  writing  into
              any of the variables which use the dimension.

       int nc_rename_dim(int ncid, int dimid, const char name[])

              (Corresponds to ncdimrename() in version 2)

              Renames an existing dimension in an open netCDF dataset.  If the new name is longer
              than the old name, the netCDF dataset must be in define mode.  You cannot rename  a
              dimension to have the same name as another dimension.

VARIABLES

       int  nc_def_var(int ncid, const char name[], nc_type xtype, int ndims, const int dimids[],
              int* varid)

              (Corresponds to ncvardef() in version 2)

              Adds a new variable to a netCDF dataset. The netCDF must be in define mode.  If not
              NULL, then varid will be set to the netCDF variable ID.

       int nc_inq_varid(int ncid, const char name[], int* varid)

              (Corresponds to ncvarid() in version 2)

              Returns the ID of a netCDF variable in varid given its name.

       int nc_inq_var(int ncid, int varid, char name[], nc_type* xtype, int* ndims, int dimids[],
              int* natts)

       int nc_inq_varname(int ncid, int varid, char name[])

       int nc_inq_vartype(int ncid, int varid, nc_type* xtype)

       int nc_inq_varndims(int ncid, int varid, int* ndims)

       int nc_inq_vardimid(int ncid, int varid, int dimids[])

       int nc_inq_varnatts(int ncid, int varid, int* natts)

              Returns information about a netCDF variable, given its ID.  If any  of  the  return
              parameters  (name,  xtype,  ndims,  dimids,  or  natts) is a NULL pointer, then the
              corresponding information will not be returned; hence, no space need  be  allocated
              for it.

       int nc_rename_var(int ncid, int varid, const char name[])

              (Corresponds to ncvarrename() in version 2)

              Changes  the  name  of  a  netCDF variable.  If the new name is longer than the old
              name, the netCDF must be in define mode.  You cannot rename a variable to have  the
              name of any existing variable.

VARIABLES in NETCDF-4 FILES

       The  following functions may only be used on variables in a netCDF-4/HDF5 data file. These
       functions must be called after the variable is defined, but before an enddef call.

       int nc_def_var_deflate(int ncid, int varid, int shuffle, int deflate, int deflate_level)

       Turn on compression and/or shuffle filter. (Shuffle filter  is  only  useful  for  integer
       data.)

       int   nc_inq_var_deflate(int   ncid,   int  varid,  int*  shufflep,  int*  deflatep,  int*
              deflate_levelp)

              Learn about a variable's deflate settings.

       int nc_def_var_fletcher32(int ncid, int varid, int fletcher32)

              Turn on checksumming for a variable.

       int nc_inq_var_fletcher32(int ncid, int varid, int* fletcher32)

              Learn about checksumming for a variable.

       int nc_def_var_chunking(int ncid, int varid, int storage, const size_t chunksizesp[])

              Set chunksizes for a variable.

       int nc_inq_var_chunking(int ncid, int varid, int* storagep, size_t chunksizesp[])

              Learn about chunksizes for a variable.

       int nc_def_var_fill(int ncid, int varid, int no_fill, const size_t chunksizesp[])

              Set a fill value for a variable.

       int nc_inq_var_fill(int ncid, int varid, int* storagep, size_t chunksizesp[])

              Learn the fill value for a variable.

       int nc_def_var_endian(int ncid, int varid, int endian)

              Set endianness of variable.

       int nc_inq_var_endian(int ncid, int varid, int* endianp)

              Learn the endianness of a variable.

WRITING AND READING WHOLE VARIABLES

       int nc_put_var_text(int ncid, int varid, const char out[])

       int nc_put_var_uchar(int ncid, int varid, const unsigned char out[])

       int nc_put_var_schar(int ncid, int varid, const signed char out[])

       int nc_put_var_short(int ncid, int varid, const short out[])

       int nc_put_var_int(int ncid, int varid, const int out[])

       int nc_put_var_long(int ncid, int varid, const long out[])

       int nc_put_var_float(int ncid, int varid, const float out[])

       int nc_put_var_double(int ncid, int varid, const double out[])

       int nc_put_var_ubyte(int ncid, int varid, const unsigned char out[])

       int nc_put_var_ushort(int ncid, int varid, const unsigned short out[])

       int nc_put_var_uint(int ncid, int varid, const unsigned int out[])

       int nc_put_var_int64(int ncid, int varid, const long long out[])

       int nc_put_var_uint64(int ncid, int varid, const unsigned long long out[])

       int nc_put_var_string(int ncid, int varid, const char * out[])

              Writes an entire netCDF variable (i.e. all the values).  The netCDF dataset must be
              open and in data mode.  The type of the data is specified in the function name, and
              it is converted to the external  type  of  the  specified  variable,  if  possible,
              otherwise  an  NC_ERANGE  error  is  returned.  Note that rounding is not performed
              during the conversion. Floating point  numbers  are  truncated  when  converted  to
              integers.

       int nc_get_var_text(int ncid, int varid, char in[])

       int nc_get_var_uchar(int ncid, int varid, unsigned char in[])

       int nc_get_var_schar(int ncid, int varid, signed char in[])

       int nc_get_var_short(int ncid, int varid, short in[])

       int nc_get_var_int(int ncid, int varid, int in[])

       int nc_get_var_long(int ncid, int varid, long in[])

       int nc_get_var_float(int ncid, int varid, float in[])

       int nc_get_var_double(int ncid, int varid, double in[])

       int nc_get_var_ubyte(int ncid, int varid, unsigned char in[])

       int nc_get_var_ushort(int ncid, int varid, unsigned short in[])

       int nc_get_var_uint(int ncid, int varid, unsigned int in[])

       int nc_get_var_int64(int ncid, int varid, long long in[])

       int nc_get_var_uint64(int ncid, int varid, unsigned long long in[])

       int nc_get_var_string(int ncid, int varid, char * in[])

              Reads  an entire netCDF variable (i.e. all the values).  The netCDF dataset must be
              open and in data mode.  The data  is  converted  from  the  external  type  of  the
              specified  variable,  if necessary, to the type specified in the function name.  If
              conversion is not possible, an NC_ERANGE error is returned.

WRITING AND READING ONE DATUM

       int nc_put_var1_text(int ncid, int varid, const size_t index[], char *out)

       int nc_put_var1_uchar(int ncid, int varid, const size_t index[], unsigned char *out)

       int nc_put_var1_schar(int ncid, int varid, const size_t index[], signed char *out)

       int nc_put_var1_short(int ncid, int varid, const size_t index[], short *out)

       int nc_put_var1_int(int ncid, int varid, const size_t index[], int *out)

       int nc_put_var1_long(int ncid, int varid, const size_t index[], long *out)

       int nc_put_var1_float(int ncid, int varid, const size_t index[], float *out)

       int nc_put_var1_double(int ncid, int varid, const size_t index[], double *out)

       int nc_put_var1_ubyte(int ncid, int varid, const size_t index[], unsigned char *out)

       int nc_put_var1_ushort(int ncid, int varid, const size_t index[], unsigned short *out)

       int nc_put_var1_uint(int ncid, int varid, const size_t index[], unsigned int *out)

       int nc_put_var1_int64(int ncid, int varid, const size_t index[], long long *out)

       int nc_put_var1_uint64(int ncid, int varid, const size_t index[], unsigned long long *out)

       int nc_put_var1_string(int ncid, int varid, const size_t index[], char * *out)

              Puts a single data value into a variable at the position index of  an  open  netCDF
              dataset  that  is  in data mode.  The type of the data is specified in the function
              name, and it is converted to the  external  type  of  the  specified  variable,  if
              possible, otherwise an NC_ERANGE error is returned.

       int nc_get_var1_text(int ncid, int varid, const size_t index[], char* in)

       int nc_get_var1_uchar(int ncid, int varid, const size_t index[], unsigned char* in)

       int nc_get_var1_schar(int ncid, int varid, const size_t index[], signed char* in)

       int nc_get_var1_short(int ncid, int varid, const size_t index[], short* in)

       int nc_get_var1_int(int ncid, int varid, const size_t index[], int* in)

       int nc_get_var1_long(int ncid, int varid, const size_t index[], long* in)

       int nc_get_var1_float(int ncid, int varid, const size_t index[], float* in)

       int nc_get_var1_double(int ncid, int varid, const size_t index[], double* in)

       int nc_get_var1_ubyte(int ncid, int varid, const size_t index[], unsigned char* in)

       int nc_get_var1_ushort(int ncid, int varid, const size_t index[], unsigned short* in)

       int nc_get_var1_uint(int ncid, int varid, const size_t index[], unsigned int* in)

       int nc_get_var1_int64(int ncid, int varid, const size_t index[], long long* in)

       int nc_get_var1_uint64(int ncid, int varid, const size_t index[], unsigned long long* in)

       int nc_get_var1_string(int ncid, int varid, const size_t index[], char ** in)

              Gets  a  single  data value from a variable at the position index of an open netCDF
              dataset that is in data mode.  The data is converted from the external type of  the
              specified  variable,  if necessary, to the type specified in the function name.  If
              conversion is not possible, an NC_ERANGE error is returned.

WRITING AND READING AN ARRAY

       int nc_put_vara_text(int ncid, int varid, const  size_t  start[],  const  size_t  count[],
              const char out[])

       int  nc_put_vara_uchar(int  ncid,  int  varid, const size_t start[], const size_t count[],
              const unsigned char out[])

       int nc_put_vara_schar(int ncid, int varid, const size_t  start[],  const  size_t  count[],
              const signed char out[])

       int  nc_put_vara_short(int  ncid,  int  varid, const size_t start[], const size_t count[],
              const short out[])

       int nc_put_vara_int(int ncid, int varid, const size_t start[], const size_t count[], const
              int out[])

       int  nc_put_vara_long(int  ncid,  int  varid,  const size_t start[], const size_t count[],
              const long out[])

       int nc_put_vara_float(int ncid, int varid, const size_t  start[],  const  size_t  count[],
              const float out[])

       int  nc_put_vara_double(int  ncid,  int varid, const size_t start[], const size_t count[],
              const double out[])

       int nc_put_vara_ubyte(int ncid, int varid, const size_t  start[],  const  size_t  count[],
              const unsigned char out[])

       int  nc_put_vara_ushort(int  ncid,  int varid, const size_t start[], const size_t count[],
              const unsigned short out[])

       int nc_put_vara_uint(int ncid, int varid, const  size_t  start[],  const  size_t  count[],
              const unsigned int out[])

       int  nc_put_vara_int64(int  ncid,  int  varid, const size_t start[], const size_t count[],
              const long long out[])

       int nc_put_vara_uint64(int ncid, int varid, const size_t start[],  const  size_t  count[],
              const unsigned long long out[])

       int  nc_put_vara_string(int  ncid,  int varid, const size_t start[], const size_t count[],
              const char * out[])

              Writes an array section of values into a netCDF variable of an open netCDF dataset,
              which  must be in data mode.  The array section is specified by the start and count
              vectors, which give the starting index and count of values along each dimension  of
              the specified variable.  The type of the data is specified in the function name and
              is converted to the external type of the specified variable, if possible, otherwise
              an NC_ERANGE error is returned.

       int nc_get_vara_text(int ncid, int varid, const size_t start[], const size_t count[], char
              in[])

       int nc_get_vara_uchar(int ncid, int varid, const size_t  start[],  const  size_t  count[],
              unsigned char in[])

       int  nc_get_vara_schar(int  ncid,  int  varid, const size_t start[], const size_t count[],
              signed char in[])

       int nc_get_vara_short(int ncid, int varid, const size_t  start[],  const  size_t  count[],
              short in[])

       int  nc_get_vara_int(int  ncid, int varid, const size_t start[], const size_t count[], int
              in[])

       int nc_get_vara_long(int ncid, int varid, const size_t start[], const size_t count[], long
              in[])

       int  nc_get_vara_float(int  ncid,  int  varid, const size_t start[], const size_t count[],
              float in[])

       int nc_get_vara_double(int ncid, int varid, const size_t start[],  const  size_t  count[],
              double in[])

       int  nc_get_vara_ubyte(int  ncid,  int  varid, const size_t start[], const size_t count[],
              unsigned char in[])

       int nc_get_vara_ushort(int ncid, int varid, const size_t start[],  const  size_t  count[],
              unsigned short in[])

       int  nc_get_vara_uint(int  ncid,  int  varid,  const size_t start[], const size_t count[],
              unsigned int in[])

       int nc_get_vara_int64(int ncid, int varid, const size_t  start[],  const  size_t  count[],
              long long in[])

       int  nc_get_vara_uint64(int  ncid,  int varid, const size_t start[], const size_t count[],
              unsigned long long in[])

       int nc_get_vara_string(int ncid, int varid, const size_t start[],  const  size_t  count[],
              char * in[])

              Reads  an array section of values from a netCDF variable of an open netCDF dataset,
              which must be in data mode.  The array section is specified by the start and  count
              vectors,  which give the starting index and count of values along each dimension of
              the specified variable.  The data is  converted  from  the  external  type  of  the
              specified  variable,  if necessary, to the type specified in the function name.  If
              conversion is not possible, an NC_ERANGE error is returned.

WRITING AND READING A SLICED ARRAY

       int nc_put_vars_text(int ncid, int varid, const  size_t  start[],  const  size_t  count[],
              const size_t stride[], const char out[])

       int  nc_put_vars_uchar(int  ncid,  int  varid, const size_t start[], const size_t count[],
              const size_t stride[], const unsigned char out[])

       int nc_put_vars_schar(int ncid, int varid, const size_t  start[],  const  size_t  count[],
              const size_t stride[], const signed char out[])

       int  nc_put_vars_short(int  ncid,  int  varid, const size_t start[], const size_t count[],
              const size_t stride[], const short out[])

       int nc_put_vars_int(int ncid, int varid, const size_t start[], const size_t count[], const
              size_t stride[], const int out[])

       int  nc_put_vars_long(int  ncid,  int  varid,  const size_t start[], const size_t count[],
              const size_t stride[], const long out[])

       int nc_put_vars_float(int ncid, int varid, const size_t  start[],  const  size_t  count[],
              const size_t stride[], const float out[])

       int  nc_put_vars_double(int  ncid,  int varid, const size_t start[], const size_t count[],
              const size_t stride[], const double out[])

       int nc_put_vars_ubyte(int ncid, int varid, const size_t  start[],  const  size_t  count[],
              const size_t stride[], const unsigned char out[])

       int  nc_put_vars_ushort(int  ncid,  int varid, const size_t start[], const size_t count[],
              const size_t stride[], const unsigned short out[])

       int nc_put_vars_uint(int ncid, int varid, const  size_t  start[],  const  size_t  count[],
              const size_t stride[], const unsigned int out[])

       int  nc_put_vars_int64(int  ncid,  int  varid, const size_t start[], const size_t count[],
              const size_t stride[], const long long out[])

       int nc_put_vars_uint64(int ncid, int varid, const size_t start[],  const  size_t  count[],
              const size_t stride[], const unsigned long long out[])

       int  nc_put_vars_string(int  ncid,  int varid, const size_t start[], const size_t count[],
              const size_t stride[], const char * out[])

              These functions are used for strided output, which is like the array section output
              described  above,  except  that  the sampling stride (the interval between accessed
              values) is specified for each dimension.  For an explanation of the sampling stride
              vector, see COMMON ARGUMENTS DESCRIPTIONS below.

       int  nc_get_vars_text(int  ncid,  int  varid,  const size_t start[], const size_t count[],
              const size_t stride[], char in[])

       int nc_get_vars_uchar(int ncid, int varid, const size_t  start[],  const  size_t  count[],
              const size_t stride[], unsigned char in[])

       int  nc_get_vars_schar(int  ncid,  int  varid, const size_t start[], const size_t count[],
              const size_t stride[], signed char in[])

       int nc_get_vars_short(int ncid, int varid, const size_t  start[],  const  size_t  count[],
              const size_t stride[], short in[])

       int nc_get_vars_int(int ncid, int varid, const size_t start[], const size_t count[], const
              size_t stride[], int in[])

       int nc_get_vars_long(int ncid, int varid, const  size_t  start[],  const  size_t  count[],
              const size_t stride[], long in[])

       int  nc_get_vars_float(int  ncid,  int  varid, const size_t start[], const size_t count[],
              const size_t stride[], float in[])

       int nc_get_vars_double(int ncid, int varid, const size_t start[],  const  size_t  count[],
              const size_t stride[], double in[])

       int  nc_get_vars_ubyte(int  ncid,  int  varid, const size_t start[], const size_t count[],
              const size_t stride[], unsigned char in[])

       int nc_get_vars_ushort(int ncid, int varid, const size_t start[],  const  size_t  count[],
              const size_t stride[], unsigned short in[])

       int  nc_get_vars_uint(int  ncid,  int  varid,  const size_t start[], const size_t count[],
              const size_t stride[], unsigned int in[])

       int nc_get_vars_int64(int ncid, int varid, const size_t  start[],  const  size_t  count[],
              const size_t stride[], long long in[])

       int  nc_get_vars_uint64(int  ncid,  int varid, const size_t start[], const size_t count[],
              const size_t stride[], unsigned long long in[])

       int nc_get_vars_string(int ncid, int varid, const size_t start[],  const  size_t  count[],
              const size_t stride[], char * in[])

              These  functions  are used for strided input, which is like the array section input
              described above, except that the sampling stride  (the  interval  between  accessed
              values) is specified for each dimension.  For an explanation of the sampling stride
              vector, see COMMON ARGUMENTS DESCRIPTIONS below.

WRITING AND READING A MAPPED ARRAY

       int nc_put_varm_text(int ncid, int varid, const  size_t  start[],  const  size_t  count[],
              const size_t stride[], imap, const char out[])

       int  nc_put_varm_uchar(int  ncid,  int  varid, const size_t start[], const size_t count[],
              const size_t stride[], imap, const unsigned char out[])

       int nc_put_varm_schar(int ncid, int varid, const size_t  start[],  const  size_t  count[],
              const size_t stride[], imap, const signed char out[])

       int  nc_put_varm_short(int  ncid,  int  varid, const size_t start[], const size_t count[],
              const size_t stride[], imap, const short out[])

       int nc_put_varm_int(int ncid, int varid, const size_t start[], const size_t count[], const
              size_t stride[], imap, const int out[])

       int  nc_put_varm_long(int  ncid,  int  varid,  const size_t start[], const size_t count[],
              const size_t stride[], imap, const long out[])

       int nc_put_varm_float(int ncid, int varid, const size_t  start[],  const  size_t  count[],
              const size_t stride[], imap, const float out[])

       int  nc_put_varm_double(int  ncid,  int varid, const size_t start[], const size_t count[],
              const size_t stride[], imap, const double out[])

       int nc_put_varm_ubyte(int ncid, int varid, const size_t  start[],  const  size_t  count[],
              const size_t stride[], imap, const unsigned char out[])

       int  nc_put_varm_ushort(int  ncid,  int varid, const size_t start[], const size_t count[],
              const size_t stride[], imap, const unsigned short out[])

       int nc_put_varm_uint(int ncid, int varid, const  size_t  start[],  const  size_t  count[],
              const size_t stride[], imap, const unsigned int out[])

       int  nc_put_varm_int64(int  ncid,  int  varid, const size_t start[], const size_t count[],
              const size_t stride[], imap, const long long out[])

       int nc_put_varm_uint64(int ncid, int varid, const size_t start[],  const  size_t  count[],
              const size_t stride[], imap, const unsigned long long out[])

       int  nc_put_varm_string(int  ncid,  int varid, const size_t start[], const size_t count[],
              const size_t stride[], imap, const char * out[])

              These functions are used for mapped output, which is like strided output  described
              above,  except  that  an additional index mapping vector is provided to specify the
              in-memory arrangement of the data values.  For an explanation of the index  mapping
              vector, see COMMON ARGUMENTS DESCRIPTIONS below.

       int  nc_get_varm_text(int  ncid,  int  varid,  const size_t start[], const size_t count[],
              const size_t stride[], imap, char in[])

       int nc_get_varm_uchar(int ncid, int varid, const size_t  start[],  const  size_t  count[],
              const size_t stride[], imap, unsigned char in[])

       int  nc_get_varm_schar(int  ncid,  int  varid, const size_t start[], const size_t count[],
              const size_t stride[], imap, signed char in[])

       int nc_get_varm_short(int ncid, int varid, const size_t  start[],  const  size_t  count[],
              const size_t stride[], imap, short in[])

       int nc_get_varm_int(int ncid, int varid, const size_t start[], const size_t count[], const
              size_t stride[], imap, int in[])

       int nc_get_varm_long(int ncid, int varid, const  size_t  start[],  const  size_t  count[],
              const size_t stride[], imap, long in[])

       int  nc_get_varm_float(int  ncid,  int  varid, const size_t start[], const size_t count[],
              const size_t stride[], imap, float in[])

       int nc_get_varm_double(int ncid, int varid, const size_t start[],  const  size_t  count[],
              const size_t stride[], imap, double in[])

       int  nc_get_varm_ubyte(int  ncid,  int  varid, const size_t start[], const size_t count[],
              const size_t stride[], imap, unsigned char in[])

       int nc_get_varm_ushort(int ncid, int varid, const size_t start[],  const  size_t  count[],
              const size_t stride[], imap, unsigned short in[])

       int  nc_get_varm_uint(int  ncid,  int  varid,  const size_t start[], const size_t count[],
              const size_t stride[], imap, unsigned int in[])

       int nc_get_varm_int64(int ncid, int varid, const size_t  start[],  const  size_t  count[],
              const size_t stride[], imap, long long in[])

       int  nc_get_varm_uint64(int  ncid,  int varid, const size_t start[], const size_t count[],
              const size_t stride[], imap, unsigned long long in[])

       int nc_get_varm_string(int ncid, int varid, const size_t start[],  const  size_t  count[],
              const size_t stride[], imap, char * in[])

              These  functions  are  used for mapped input, which is like strided input described
              above, except that an additional index mapping vector is provided  to  specify  the
              in-memory  arrangement of the data values.  For an explanation of the index mapping
              vector, see COMMON ARGUMENTS DESCRIPTIONS below.

ATTRIBUTES

       int nc_put_att_text(int ncid, int varid, const char name[],  nc_type  xtype,  size_t  len,
              const char out[])

       int  nc_put_att_uchar(int  ncid,  int varid, const char name[], nc_type xtype, size_t len,
              const unsigned char out[])

       int nc_put_att_schar(int ncid, int varid, const char name[], nc_type  xtype,  size_t  len,
              const signed char out[])

       int  nc_put_att_short(int  ncid,  int varid, const char name[], nc_type xtype, size_t len,
              const short out[])

       int nc_put_att_int(int ncid, int varid, const char  name[],  nc_type  xtype,  size_t  len,
              const int out[])

       int  nc_put_att_long(int  ncid,  int  varid, const char name[], nc_type xtype, size_t len,
              const long out[])

       int nc_put_att_float(int ncid, int varid, const char name[], nc_type  xtype,  size_t  len,
              const float out[])

       int  nc_put_att_double(int  ncid, int varid, const char name[], nc_type xtype, size_t len,
              const double out[])

       int nc_put_att_ubyte(int ncid, int varid, const char name[], nc_type  xtype,  size_t  len,
              const unsigned char out[])

       int  nc_put_att_ushort(int  ncid, int varid, const char name[], nc_type xtype, size_t len,
              const unsigned short out[])

       int nc_put_att_uint(int ncid, int varid, const char name[],  nc_type  xtype,  size_t  len,
              const unsigned int out[])

       int  nc_put_att_int64(int  ncid,  int varid, const char name[], nc_type xtype, size_t len,
              const long long out[])

       int nc_put_att_uint64(int ncid, int varid, const char name[], nc_type xtype,  size_t  len,
              const unsigned long long out[])

       int  nc_put_att_string(int  ncid, int varid, const char name[], nc_type xtype, size_t len,
              const char * out[])

       int nc_put_att(int ncid, int varid, const char name[], nc_type xtype, size_t len,  void  *
              ip)

       int nc_get_att(int ncid, int varid, const char name[], void ** ip)

              Unlike  variables,  attributes  do  not  have  separate  functions for defining and
              writing values.  This family of functions defines a new attribute with a  value  or
              changes  the  value  of  an existing attribute.  If the attribute is new, or if the
              space required to store the attribute value is  greater  than  before,  the  netCDF
              dataset must be in define mode.  The parameter len is the number of values from out
              to transfer.  It is often one, except that for nc_put_att_text() it will usually be
              strlen(out).

              For  these  functions,  the  type  component of the function name refers to the in-
              memory type of the value, whereas the xtype argument refers to  the  external  type
              for  storing  the  value.  An NC_ERANGE error results if a conversion between these
              types is not possible.  In this case the value is represented with the  appropriate
              fill-value for the associated external type.

       int nc_inq_attname(int ncid, int varid, int attnum, char name[])

              Gets  the  name  of an attribute, given its variable ID and attribute number.  This
              function is useful in generic applications that need to get the names  of  all  the
              attributes associated with a variable, since attributes are accessed by name rather
              than number in all other attribute functions.  The number of an attribute  is  more
              volatile  than  the  name,  since  it  can change when other attributes of the same
              variable are deleted.  The attributes for each variable are numbered  from  0  (the
              first  attribute)  to  nvatts-1,  where  nvatts is the number of attributes for the
              variable, as returned from a call to nc_inq_varnatts().  If the name parameter is a
              NULL pointer, no name will be returned and no space need be allocated.

       int nc_inq_att(int ncid, int varid, const char name[], nc_type* xtype, size_t* len)

       int nc_inq_attid(int ncid, int varid, const char name[], int* attnum)

       int nc_inq_atttype(int ncid, int varid, const char name[], nc_type* xtype)

       int nc_inq_attlen(int ncid, int varid, const char name[], size_t* len)

              These  functions return information about a netCDF attribute, given its variable ID
              and name.  The information returned is the external type in xtype and the number of
              elements  in  the  attribute  as  len.   If  any  of the return arguments is a NULL
              pointer, the specified information will not be returned.

       int nc_copy_att(int ncid, int varid_in, const char name[], int ncid_out, int varid_out)

              Copies an attribute from one netCDF dataset to another.  It can  also  be  used  to
              copy  an attribute from one variable to another within the same netCDF.  ncid_in is
              the netCDF ID of an input netCDF dataset from which the attribute will  be  copied.
              varid_in  is  the  ID  of  the  variable in the input netCDF dataset from which the
              attribute will be copied, or NC_GLOBAL for a global attribute.  name is the name of
              the  attribute in the input netCDF dataset to be copied.  ncid_out is the netCDF ID
              of the output netCDF dataset  to  which  the  attribute  will  be  copied.   It  is
              permissible for the input and output netCDF ID's to be the same.  The output netCDF
              dataset should be in define mode if the attribute to be  copied  does  not  already
              exist for the target variable, or if it would cause an existing target attribute to
              grow.  varid_out is the ID of the variable in the output netCDF  dataset  to  which
              the attribute will be copied, or NC_GLOBAL to copy to a global attribute.

       int nc_rename_att(int ncid, int varid, const char name[], const char newname[])

              Changes  the  name  of  an  attribute.  If the new name is longer than the original
              name, the netCDF must be in define mode.  You cannot rename an  attribute  to  have
              the  same  name  as  another  attribute of the same variable.  name is the original
              attribute name.  newname is the new name to be assigned to the specified attribute.
              If  the  new name is longer than the old name, the netCDF dataset must be in define
              mode.

       int nc_del_att(int ncid, int varid, const char name[])

              Deletes an attribute from a netCDF dataset.  The dataset must be in define mode.

       int nc_get_att_text(int ncid, int varid, const char name[], char in[])

       int nc_get_att_uchar(int ncid, int varid, const char name[], unsigned char in[])

       int nc_get_att_schar(int ncid, int varid, const char name[], signed char in[])

       int nc_get_att_short(int ncid, int varid, const char name[], short in[])

       int nc_get_att_int(int ncid, int varid, const char name[], int in[])

       int nc_get_att_long(int ncid, int varid, const char name[], long in[])

       int nc_get_att_float(int ncid, int varid, const char name[], float in[])

       int nc_get_att_double(int ncid, int varid, const char name[], double in[])

       int nc_get_att_ubyte(int ncid, int varid, const char name[], unsigned char in[])

       int nc_get_att_ushort(int ncid, int varid, const char name[], unsigned short in[])

       int nc_get_att_uint(int ncid, int varid, const char name[], unsigned int in[])

       int nc_get_att_int64(int ncid, int varid, const char name[], long long in[])

       int nc_get_att_uint64(int ncid, int varid, const char name[], unsigned long long in[])

       int nc_get_att_string(int ncid, int varid, const char name[], char * in[])

              Gets the value(s) of a netCDF attribute, given its variable ID and name.   Converts
              from  the  external  type  to the type specified in the function name, if possible,
              otherwise returns an NC_ERANGE error.  All elements  of  the  vector  of  attribute
              values  are returned, so you must allocate enough space to hold them.  If you don't
              know how much space to reserve, call nc_inq_attlen() first to find out  the  length
              of the attribute.

COMMON ARGUMENT DESCRIPTIONS

       In  this  section  we  define  some  common  arguments  which  are  used  in the "FUNCTION
       DESCRIPTIONS" section.

       int ncid
              is the netCDF ID  returned  from  a  previous,  successful  call  to  nc_open()  or
              nc_create()

       char name[]
              is  the  name  of  a  dimension,  variable,  or attribute. The names of dimensions,
              variables and attributes consist of arbitrary sequences of alphanumeric  characters
              (as  well as underscore '_', period '.' and hyphen '-'), beginning with a letter or
              underscore. (However names commencing with underscore are reserved for system use.)
              Case  is  significant  in  netCDF  names. A zero-length name is not allowed.  As an
              input argument, it shall be a pointer  to  a  0-terminated  string;  as  an  output
              argument,  it shall be the address of a buffer in which to hold such a string.  The
              maximum  allowable  number  of  characters  (excluding  the   terminating   0)   is
              NC_MAX_NAME.

       nc_type xtype
              specifies  the  external  data type of a netCDF variable or attribute and is one of
              the following: NC_BYTE, NC_CHAR, NC_SHORT, NC_INT, NC_FLOAT, or  NC_DOUBLE.   These
              are  used  to specify 8-bit integers, characters, 16-bit integers, 32-bit integers,
              32-bit IEEE  floating  point  numbers,  and  64-bit  IEEE  floating-point  numbers,
              respectively.   (NC_INT  corresponds  to  NC_LONG in version 2, to specify a 32-bit
              integer).

       int dimids[]
              is a vector of dimension ID's and defines the shape of a netCDF variable.  The size
              of  the  vector  shall  be  greater  than  or equal to the rank (i.e. the number of
              dimensions) of the variable (ndims).  The vector shall be ordered by the speed with
              which  a  dimension  varies:  dimids[ndims-1] shall be the dimension ID of the most
              rapidly varying dimension and dimids[0] shall be  the  dimension  ID  of  the  most
              slowly varying dimension.  The maximum possible number of dimensions for a variable
              is given by the symbolic constant NC_MAX_VAR_DIMS.

       int dimid
              is the ID of a netCDF dimension.  netCDF dimension ID's are allocated  sequentially
              from the non-negative integers beginning with 0.

       int ndims
              is  either the total number of dimensions in a netCDF dataset or the rank (i.e. the
              number of dimensions) of a netCDF variable.  The value shall  not  be  negative  or
              greater than the symbolic constant NC_MAX_VAR_DIMS.

       int varid
              is the ID of a netCDF variable or (for the attribute-access functions) the symbolic
              constant NC_GLOBAL, which is used to reference global attributes.  netCDF  variable
              ID's are allocated sequentially from the non-negative integers beginning with 0.

       int* natts
              is  the  number  of  global  attributes  in  a netCDF dataset  for the nc_inquire()
              function or the number of attributes associated with  a  netCDF  variable  for  the
              nc_varinq() function.

       const size_t index[]
              specifies  the  indicial  coordinates of the netCDF data value to be accessed.  The
              indices start at 0; thus, for example, the first data value  of  a  two-dimensional
              variable  is  (0,0).   The  size  of  the  vector shall be at least the rank of the
              associated netCDF variable and its elements shall  correspond,  in  order,  to  the
              variable's dimensions.

       const size_t start[]
              specifies the starting point for accessing a netCDF variable's data values in terms
              of the indicial coordinates of the corner of the array section.  The indices  start
              at  0; thus, the first data value of a variable is (0, 0, ..., 0).  The size of the
              vector shall be at least the  rank  of  the  associated  netCDF  variable  and  its
              elements shall correspond, in order, to the variable's dimensions.

       const size_t count[]
              specifies the number of indices selected along each dimension of the array section.
              Thus, to access a single value, for example, specify count as (1, 1, ..., 1).  Note
              that,  for  strided  I/O,  this argument must be adjusted to be compatible with the
              stride and start arguments so that the interaction of the three does not attempt to
              access  an  invalid data co-ordinate.  The elements of the count vector correspond,
              in order, to the variable's dimensions.

       const size_t stride[]
              specifies the sampling interval along each dimension of the netCDF variable.    The
              elements  of  the  stride  vector  correspond,  in  order, to the netCDF variable's
              dimensions (stride[0]) gives the sampling interval along the  most  slowly  varying
              dimension  of  the  netCDF  variable).   Sampling  intervals are specified in type-
              independent units of elements (a value of 1 selects  consecutive  elements  of  the
              netCDF variable along the corresponding dimension, a value of 2 selects every other
              element, etc.).  A NULL stride argument is treated as (1, 1, ... , 1).

       imap   specifies the mapping between the dimensions of a netCDF variable and the in-memory
              structure  of  the  internal  data array.  The elements of the index mapping vector
              correspond, in order, to  the  netCDF  variable's  dimensions  (imap[0]  gives  the
              distance  between  elements  of the internal array corresponding to the most slowly
              varying  dimension  of  the  netCDF  variable).   Distances  between  elements  are
              specified  in  type-independent  units  of  elements (the distance between internal
              elements that occupy adjacent memory locations is 1 and  not  the  element's  byte-
              length  as  in netCDF 2).  A NULL pointer means the memory-resident values have the
              same structure as the associated netCDF variable.

VARIABLE PREFILLING

       By default, the netCDF interface sets the values of all newly-defined variables of  finite
       length  (i.e.  those that do not have an unlimited, dimension) to the type-dependent fill-
       value associated with each variable.  This is done when nc_enddef() is called.  The  fill-
       value  for  a  variable  may  be  changed from the default value by defining the attribute
       `_FillValue' for the variable.  This attribute must have the same type as the variable and
       be of length one.

       Variables  with  an  unlimited  dimension are also prefilled, but on an `as needed' basis.
       For example, if the first write of such a variable is to  position  5,  then  positions  0
       through 4 (and no others) would be set to the fill-value at the same time.

       This  default  prefilling of data values may be disabled by or'ing the NC_NOFILL flag into
       the mode parameter of nc_open() or nc_create(), or, by calling the function  nc_set_fill()
       with  the argument NC_NOFILL.  For variables that do not use the unlimited dimension, this
       call must be made before nc_enddef().  For variables that  use  the  unlimited  dimension,
       this call may be made at any time.

       One  can  obtain  increased performance of the netCDF interface by using this feature, but
       only at the expense of requiring the application to set  every  single  data  value.   The
       performance  enhancing  behavior  of  this function is dependent on the particulars of the
       implementation and dataset format.  The flag value  controlled  by  nc_set_fill()  is  per
       netCDF  ID,  not per variable or per write.  Allowing this to change affects the degree to
       which a program can be effectively parallelized.  Given all of this, we state that the use
       of  this feature may not be available (or even needed) in future releases. Programmers are
       cautioned against heavy reliance upon this feature.

       int nc_setfill(int ncid, int fillmode, int* old_fillemode)

              (Corresponds to ncsetfill() in version 2)

              Determines whether or not variable prefilling will be done (see above).  The netCDF
              dataset  shall  be  writable.  fillmode is either NC_FILL to enable prefilling (the
              default) or NC_NOFILL to disable prefilling.  This function  returns  the  previous
              setting in old_fillmode.

MPP FUNCTION DESCRIPTIONS

       Additional  functions  for use on SGI/Cray MPP machines (_CRAYMPP).  These are used to set
       and inquire which PE is the base for MPP for a particular netCDF. These are only  relevant
       when  using  the  SGI/Cray  ``global''  Flexible  File I/O layer and desire to have only a
       subset of PEs to open the specific netCDF file.  For technical  reasons,  these  functions
       are  available  on all platforms.  On a platform other than SGI/Cray MPP, it is as if only
       processor available were processor 0.

       To use this feature, you need to specify a communicator group and call glio_group_mpi() or
       glio_group_shmem() prior to the netCDF nc_open() and nc_create() calls.

       int  nc__create_mp(const  char  path[],  int  cmode,  size_t  initialsize, int pe, size_t*
              chunksize, int* ncid)

              Like nc__create() but allows the base PE to be set.

              The argument pe sets the  base  PE  at  creation  time.  In  the  MPP  environment,
              nc__create() and nc_create() set the base PE to processor zero by default.

       int nc__open_mp(const char path[], int mode, int pe, size_t* chunksize, int* ncid)

              Like nc__open() but allows the base PE to be set.  The argument pe sets the base PE
              at creation time. In the MPP environment, nc__open() and nc_open() set the base  PE
              to processor zero by default.

       int nc_inq_base_pe(int ncid, int* pe)

              Inquires  of  the  netCDF  dataset  which PE is being used as the base for MPP use.
              This is safe to use at any time.

       int nc_set_base_pe(int ncid, int pe)

              Resets the base PE for the netCDF dataset.  Only perform this  operation  when  the
              affected communicator group synchronizes before and after the call.  This operation
              is very risky and should only be contemplated under only the most extreme cases.

ENVIRONMENT VARIABLES

       NETCDF_FFIOSPEC
           Specifies the Flexible File I/O buffers for netCDF I/O when executing under the UNICOS
           operating system (the variable is ignored on other operating systems).  An appropriate
           specification can greatly increase the efficiency of netCDF I/O -- to the extent  that
           it can actually surpass FORTRAN binary I/O.  This environment variable has been made a
           little more generalized, such that other FFIO option specifications can now be  added.
           The  default  specification  is  bufa:336:2, unless a current FFIO specification is in
           operation, which will be honored.  See UNICOS Flexible File I/O for more information.

MAILING-LISTS

       Both a mailing list and a digest are available for discussion of the netCDF interface  and
       announcements  about  netCDF  bugs,  fixes,  and  enhancements.   To  begin or change your
       subscription to either the mailing-list or the digest, send one of the  following  in  the
       body (not the subject line) of an email message to "majordomo@unidata.ucar.edu".  Use your
       email address in place of jdoe@host.inst.domain.

       To subscribe to the netCDF mailing list:
              subscribe netcdfgroup jdoe@host.inst.domain
       To unsubscribe from the netCDF mailing list:
              unsubscribe netcdfgroup jdoe@host.inst.domain
       To subscribe to the netCDF digest:
              subscribe netcdfdigest jdoe@host.inst.domain
       To unsubscribe from the netCDF digest:
              unsubscribe netcdfdigest jdoe@host.inst.domain
       To retrieve the general introductory information for the mailing list:
              info netcdfgroup
       To get a synopsis of other majordomo commands:
              help

SEE ALSO

       ncdump(1), ncgen(1), netcdf(3).

       netCDF User's Guide, published by the Unidata Program Center, University  Corporation  for
       Atmospheric Research, located in Boulder, Colorado.

       NetCDF home page at http:/www.unidata.ucar.edu/netcdf.