NAME

       Arithmetic - arithmetic operations on images and numbers

SYNOPSIS

       astarithmetic [OPTION...] ASTRdata or number [ASTRdata] OPERATOR ...

DESCRIPTION

       Arithmetic  is  part  of  GNU  Astronomy  Utilities  0.18.   Arithmetic will do arithmetic
       operations on one or multiple images and numbers.  Simply put, the name of the image along
       with  the arithmetic operators and possible numbers are given as arguments. The extensions
       of each input are specified with (possibly multiple) calls to the '--hdu' option.

       Currently Arithmetic only supports postfix or reverse polish notation. For example to  get
       the  result  of  '5+6', you should write '5 6 +', or to get the average of two images, you
       should write 'a.fits b.fits + 2 /' (or more simply use the 'average' operator with 'a.fits
       b.fits average'). Please see the manual for more information.

       Arithmetic recognizes a large collection of standard operators, including basic arithmetic
       (e.g., +, -, x, /), mathematical (e.g., abs, pow, sqrt, log), statistical (minvalue,  min,
       max,  average),  comparison (e.g., lt, le, gt), logical (e.g., and, or, not), the full set
       of bitwise operators, and numeric type conversion operators to all known types. Please run
       the command below for a complete list describing all operators (press the 'SPACE' keyboard
       key, or arrow keys, to go down and 'q' to return to the command-line):

              $ info gnuastro "Arithmetic operators"

       For more information, please run any of the following commands. In particular  the  second
       contains  a  very comprehensive explanation of Arithmetic's invocation: expected input(s),
       output(s), and a full description of all the options.

       All options and their values:
              $ astarithmetic -P

       Inputs/Outputs and options:
              $ info astarithmetic

       Full section in manual/book:
              $ info Arithmetic

       Full Gnuastro manual/book:
              $ info gnuastro

       If you couldn't find your answer in the manual, you can get direct help  from  experienced
       Gnuastro users and developers. For more information, please run:

              $ info help-gnuastro

       Arithmetic options:

              Input:

       --envseed
              Use GSL_RNG_SEED env. for mknoise operator.

       -g, --globalhdu=STR
              Use this HDU for all inputs, ignore '--hdu'.

       -h, --hdu=STR/INT
              Nth call, used for HDU of Nth input FITS.

       -I, --ignorecase
              Ignore case in matching/searching columns.

       --searchin=STR
              Select column(s): 'name', 'unit', 'comment'.

       -w, --wcsfile=FITS
              File to use for output's WCS.

       -W, --wcshdu=STR
              HDU/extension to use for output's WCS.

              Tessellation (tile grid):

       --interpmetric=STR
              Interpolation metric (radial, manhattan).

              Output:

       -c, --metacomment=STR
              Internal comments (FITS images: COMMENT keyword).

       -D, --dontdelete
              Don't delete output if it exists.

       -K, --keepinputdir
              Keep input directory for automatic output.

       -n, --metaname=STR
              Internal name (FITS images: EXTNAME keyword).

       -o, --output=STR
              Output file name.

       -O, --onedasimage
              Write 1D outputs as an image, not a table.

       -s, --onedonstdout
              Write 1D output on stdout, not in a table.

       --tableformat=STR
              Table fmt: 'fits-ascii', 'fits-binary', 'txt'.

       -u, --metaunit=STR
              Internal units (FITS images: BUNIT keyword).

       --wcslinearmatrix=STR
              WCS linear matrix of output ('pc' or 'cd').

              Operating modes:

       -?, --help
              give this help list

       --checkconfig
              List all config files and variables read.

       --cite BibTeX citation for this program.

       --config=STR
              Read configuration file STR immediately.

       --lastconfig
              Do not parse any more configuration files.

       --log  Information about output(s) in a log file.

       --minmapsize=INT
              Min. bytes to avoid RAM automatically.

       -N, --numthreads=INT
              Number of CPU threads to use.

       --onlyversion=STR
              Only run if the program version is STR.

       -P, --printparams
              Print parameter values to be used and abort.

       --quietmmap
              Don't print mmap'd file's name and size.

       -q, --quiet
              Only report errors, remain quiet about steps.

       -S, --setdirconf
              Set default values for this directory and abort.

       --usage
              give a short usage message

       -U, --setusrconf
              Set default values for this user and abort.

       -V, --version
              print program version

       Mandatory  or  optional  arguments  to long options are also mandatory or optional for any
       corresponding short options.

       GNU Astronomy Utilities home page: http://www.gnu.org/software/gnuastro/

REPORTING BUGS

       Report bugs to bug-gnuastro@gnu.org.

COPYRIGHT

       Copyright © 2015-2022 Free Software Foundation, Inc.  License GPLv3+: GNU  General  public
       license version 3 or later.
       This  is free software: you are free to change and redistribute it.  There is NO WARRANTY,
       to the extent permitted by law.

       Written/developed by Mohammad Akhlaghi

SEE ALSO

       The full documentation for Arithmetic is maintained as a Texinfo manual.  If the info  and
       Arithmetic programs are properly installed at your site, the command

              info Arithmetic

       should give you access to the complete manual.