NAME

       ncap - netCDF Arithmetic Processor

SYNTAX

       ncap [-3] [-4] [-6] [-7] [-A] [-C] [-c] [-D dbg_lvl] [-F] [-f] [-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 © 1995-2010 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)