SgpViz is a GAP package for (finite) semigroup visualisation.
This is release 0.999.4 of the package
The features of this package include
There is a manual in the sub-directory
doc written using the GAP package
gapdoc which describes the available functions in detail. The pdf, html
versions of the manual are also available there.
The current maintainer of the package is Manuel Delgado email@example.com.
In many aspects the present package was superseeded by the package “semigroups” by James Mitchel. I encourage you to use it instead of SgpViz. While there are some features not covered by the “semigroups” package, an effort will be made for keeping SgpViz working. If you have found important features missing or if there is a bug, I would appreciate it very much if you send me an email.
With this version you should have obtained the following files and directories:
|gap||the GAP code|
|tst||a test file|
|init.g||the file that initializes this package|
|read.g||the file that reads in the package|
|PackageInfo.g||information file for automatic processing|
|version||the version number|
The package shall be distributed with the main GAP archive. In this case, in order to use it you just have to start GAP and type
LoadPackage( "sgpviz" );
For updates between releases of GAP itself or in case it is not distributed with the main GAP archive, check the package Web page
For the development version, please visit the repository in GitHub (https://github.com/gap-packages/sgpviz/)
You may get
SgpViz as a compressed tar archive (file name ends with
.tar.gz). Use the appropriate command on your system to unpack the
On UNIX systems the compressed tar archive may be unpacked by
tar xzf sgpviz-<version>.tar.gz
or, if tar on your system does not understand the option z, by
gunzip sgpviz-<version>.tar.gz tar xf sgpviz-<version>.tar
which will in each case unpack the code into a directory
in the current directory. We assume that the current directory is the
This package needs the package
You may have to start GAP with the -l option, for instance,
gap -l "/usr/local/lib/gap-4.x.x"
Then try the following
gap> LoadPackage( "sgpviz" ); true gap>
If you use a LINUX system, you may have to, in order to save typing, write aliases:
in the file
.bash_aliases (or something equivalent, maybe with another syntax):
alias gap='gap -l "/usr/local/lib/gap-4.x.x;"'
and in the file
LoadPackage( "sgpviz" );
In order to have automatic visualisations and not just to produce the dot code to be visualised by any other means, GraphViz (http://www.graphviz.org/) should be installed.
In order to be able to use a GUI to give automata or semigroups, Tcl/Tk should also be installed.
In other systems, there are equivalent ways to do the same.
SgpViz is free software you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2 of the License, or (at your
option) any later version. For details, see the file
as part of this package or see the FSF’s own site.