Arithmetic - arithmetic operations on images and numbers

**astarithmetic** [

*OPTION*...]

*ASTRdata or number
*[

*ASTRdata*]

*OPERATOR *...

Arithmetic is part of GNU Astronomy Utilities 0.4. 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:

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

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

- Output:

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

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

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

- Operating modes:

- -?,
**--help**
- give this help list

**--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*
- Minimum bytes in array to not use ram RAM.

**-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.

**-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/

Report bugs to bug-gnuastro@gnu.org.

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

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.