NAME

       ncap - netCDF Arithmetic Processor

SYNTAX

       ncap  [-3] [-4] [-6] [-7] [-A] [-C] [-c] [-D dbg_lvl] [-F] [-f] [--glb att_name= att_val]]
       [-h] [--hdf] [--hdr_pad sz] [-L dfl_lvl] [-l path] [--no_tmp_fl] [-O] [-o output-file] [-p
       path]  [-R]  [-r]  [--ram_all]  [-S  script-file][-s  script][-v var[, ... ]] input-file [
       output-file ]

DESCRIPTION

       ncap arithmetically processes a netCDF file.  However, in about 2008 ncap  was  deprecated
       in  favor  of  ncap2  which  far  surpasses  its  capabilities.   ncap  will eventually be
       completely removed from NCO.  It is currently retained only because it provides an easier-
       to-build arithmetic operator than ncap2.

       The  processing  instructions  are  contained either in the NCO script file fl.nco or in a
       sequence of command line arguments.  The options -s (or long options  --spt  or  --script)
       are  used  for in-line scripts and -S (or long options --fl_spt or --script-file) are used
       to provide the filename where (usually multiple) scripting commands are pre-stored.   ncap
       was written to perform arbitrary albebraic transformations of data and archive the results
       as easily as possible.   Missing  values  are  treated  correctly.   The  results  of  the
       algebraic manipulations are called derived fields.

       Unlike  the other operators, ncap does not accept a list of variables to be operated on as
       an argument to -v.  Rather, the -v switch takes  no  arguments  and  indicates  that  ncap
       should  output  only  user-defined  variables.   ncap does not accept or understand the -x
       switch.

EXAMPLES

       Compute the square of variable T
              ncap -s "T2=T*T" in.nc out.nc

AUTHOR

       NCO manual pages written by Charlie Zender and originally formatted by Brian Mays.

REPORTING BUGS

       Report bugs to <http://sf.net/bugs/?group_id=3331>.

COPYRIGHT

       Copyright © 1995-2016 Charlie Zender
       This is free software; see the source for copying conditions.  There is NO  warranty;  not
       even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

SEE ALSO

       The  full  documentation  for  NCO is maintained as a Texinfo manual called the NCO User's
       Guide.  Because NCO is mathematical in nature, the  documentation  includes  TeX-intensive
       portions   not  viewable  on  character-based  displays.   Hence  the  only  complete  and
       authoritative versions of the NCO  User's  Guide  are  the  PDF  (recommended),  DVI,  and
       Postscript   versions  at  <http://nco.sf.net/nco.pdf>,  <http://nco.sf.net/nco.dvi>,  and
       <http://nco.sf.net/nco.ps>,  respectively.   HTML  and  XML  versions  are  available   at
       <http://nco.sf.net/nco.html> and <http://nco.sf.net/nco.xml>, respectively.

       If the info and NCO programs are properly installed at your site, the command

              info nco

       should give you access to the complete manual, except for the TeX-intensive portions.

HOMEPAGE

       The NCO homepage at <http://nco.sf.net> contains more information.

                                                                                          NCAP(1)