Provided by: gnuastro_0.5-1_amd64

**NAME**

Arithmetic - arithmetic operations on images and numbers

**SYNOPSIS**

astarithmetic[OPTION...]ASTRdataornumber[ASTRdata]OPERATOR...

**DESCRIPTION**

Arithmetic is part of GNU Astronomy Utilities 0.5. 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-PInputs/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:-g,--globalhdu=STRUse this HDU for all inputs, ignore `--hdu'.-h,--hdu=STR/INT Nth call, used for HDU of Nth input FITS. Output:-D,--dontdeleteDon't delete output if it exists.-K,--keepinputdirKeep input directory for automatic output.-o,--output=STROutput name. Operating modes: -?,--helpgive this help list--citeBibTeX citation for this program.--config=STRRead configuration file STR immediately.--lastconfigDo not parse any more configuration files.--logInformation about output(s) in a log file.--minmapsize=INTMinimum bytes in array to not use ram RAM.-N,--numthreads=INTNumber of CPU threads to use.--onlyversion=STROnly run if the program version is STR.-P,--printparamsPrint parameter values to be used and abort.-q,--quietOnly report errors, remain quiet about steps.-S,--setdirconfSet default values for this directory and abort.--usagegive a short usage message-U,--setusrconfSet default values for this user and abort.-V,--versionprint 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 © 2015-2017, 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 forArithmeticis maintained as a Texinfo manual. If theinfoandArithmeticprograms are properly installed at your site, the commandinfoArithmeticshould give you access to the complete manual.