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ARITHMETIC(1) User Commands ARITHMETIC(1) NAME Arithmetic - arithmetic operations on images and numbers SYNOPSIS astarithmetic [OPTION...] ASTRdata or number [ASTRdata] OPERATOR ... DESCRIPTION Arithmetic is part of GNU Astronomy Utilities 0.24. 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 num- bers 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 sim- ply 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 com- mand 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 com- mand-line): $ info gnuastro "Arithmetic operators" For more information, please run any of the following commands. In particu- lar 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: --arguments=STR Plain-text file with command-line arguments. --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: --append If output file exists, append to existing HDUs. -a, --writeall Write all remaining data in the 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). --outfitsnocommit No Git commit in 0-th HDU of output FITS. --outfitsnoconfig No metadata in 0-th HDU of output FITS. --outfitsnodate No 'DATE' in 0-th HDU of output FITS. --outfitsnoversions No versions in 0-th HDU of output FITS. -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. --config-prefix=STR Custom prefix of option names config files. --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 op- tional 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 (C) 2015-2025 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. GNU Astronomy Utilities 0.24 November 2025 ARITHMETIC(1)
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