NAME

Arithmetic - arithmetic operations on images and numbers

SYNOPSIS

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

DESCRIPTION

Arithmetic is part of GNU Astronomy Utilities 0.19. 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.