Arithmetic - arithmetic operations on images and numbers
astarithmetic [
OPTION...]
ASTRdata or number
[
ASTRdata]
OPERATOR ...
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/
Report bugs to
[email protected].
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
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.