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The GAP package Alnuth (Version
3)
==================================
> Copyright (C)
2011 Bjoern Assmann, Andreas Distler, Bettina Eick
>
> This
program 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.
>
> This
program is distributed
in the hope that it will be useful,
> but WITHOUT ANY WARRANTY; without even the implied warranty
of
> MERCHANTABILITY
or FITNESS
FOR A PARTICULAR PURPOSE. See the
> GNU General
Public License
for more details.
>
> You should have received a copy
of the GNU General
Public License
> along
with this
program.
If not, see <https:
//www.gnu.org/licenses/>.
Alnuth
is an extension, a so called package,
for the computer algebra system
GAP
and forms part
of a standard installation.
For information about GAP see
<https:
//www.gap-system.org/>.
The functionality
of Alnuth lies
in ALgebraic NUmber THeory. It provides an
interface from GAP
to certain number theoretic functions from the computer
algebra system PARI/GP. Most computations
with Alnuth rely on this
interface.
The
interface is an integral part
of the package, but the software PARI/GP
has
to be obtained independently.
New
in Version
3
================
Up
to and including Version
2.
3.
1, Alnuth was restricted
to operating systems
based on Unix. This
is no longer the
case and Alnuth can now also be used
under Windows. Moreover, former versions
of Alnuth provided an
interface to
KANT, respectively its shell KASH, instead
of one
to PARI/GP. This change did
not influence the availability
of GAP functions
in the package. Note that any
further changes
and bugfixes will only be made
to Version
3 of Alnuth which
contains the
interface to PARI/GP.
Installing Alnuth
=================
The package Alnuth
is part
of the standard distribution
of GAP so that
in most
cases there
is no need
to install it separately.
To use Alnuth you need
to
have PARI/GP installed. See the following section
for information on PARI/GP.
In case you want
to update Alnuth independently
of your main GAP installation,
you can download it from its homepage <https:
//gap-packages.github.io/alnuth/>.
If you are interested
in an old version
of Alnuth interfacing
to KANT/KASH
you can find all released versions
of Alnuth starting from v1.
0 (
09/
10/
2003)
at <https:
//github.com/gap-packages/alnuth/releases>.
There are two ways
of installing a GAP package.
If you have permission
to add
files
to the installation
of GAP on your system you may install Alnuth into
the `pkg` subdirectory
of the GAP installation tree. Otherwise you may install
Alnuth
in a
private `pkg` directory (
for details see
'76.1 Installing a GAP
Package
' and '9.
2 GAP Root Directories
' in the GAP reference manual).
To install the latest version
of Alnuth download the `alnuth.tar.gz` archive,
move it
to the directory `pkg`
in which you want
to install,
and unpack the
archive.
If you are using the command line you can unpack
with the command
`tar xzf alnuth.tar.gz`.
Getting PARI/GP
===============
Using Alnuth requires an installation
of PARI/GP
in Version
2.
5 or higher. The
software PARI/GP
is freely available at <https:
//pari.math.u-bordeaux.fr/>.
Note that the place where PARI/GP
is located
in your system
is independent
of
the place where Alnuth
is installed.
In many Linux distributions PARI/GP can be installed via the software package
manager, but this might sometimes be an older version which cannot be used
together
with Alnuth.
If you install PARI/GP from source make sure you install
with GMP support
for
better performance
and complete the installation
with `make install` so that
you can start GP by just calling `gp` from the command line.
For Windows it
is sufficient
to get the basic GP binary which can be found at
<https:
//pari.math.u-bordeaux.fr/download.html>.
Adjust the path
of the executable
for GP
========================================
This package needs
to know where the executable
for GP
is.
In the default
setting Alnuth looks
for an executable
program named `gp`
in the search paths
of the system. More precisely,
for a
file `gp` inside one
of the directories
in the list returned by `DirectoriesSystemPrograms()`.
Under Linux the default setting should work
with a standard installation
of
PARI/GP.
For the default setting
to work under Windows the downloaded executable
file,
for example `gp-
2-
5-
0.exe` has
to be renamed
to `gp.exe`
and moved
to one
of
the directories listed by `DirectoriesSystemPrograms()`.
If you cannot use the default setting
for you purpose, you can find more
information
in the last chapter
of the Alnuth manual.
Loading the package
===================
If Alnuth
is not loaded when GAP
is started you have
to request it explicitly
to use it. This
is done by calling `LoadPackage(
"Alnuth");`
in a GAP session.
If Alnuth had
not been loaded already a short banner will be displayed.
gap> LoadPackage(
"Alnuth");
Loading Alnuth
3.
2.
1 (Algebraic number theory
and an
interface to PARI/GP)
by Björn Assmann,
Andreas Distler (a.distler@tu-bs.de),
and
Bettina Eick (http:
//www.iaa.tu-bs.de/beick).
maintained by:
The GAP Team (support@gap-system.org).
Homepage: https:
//gap-packages.github.io/alnuth
Report issues at https:
//github.com/gap-packages/alnuth/issues
true
gap>
To load a certain version
of Alnuth you can specify the version number
as
second argument
in the call
to `LoadPackage`. (See
'76.2 Loading a GAP
package
' in the reference manual or type `?LoadPackage` within a GAP session).
Testing the package
===================
Once the package
is loaded, it
is possible
to check the correct installation
running a short test by calling `ReadPackage(
"Alnuth",
"tst/testinstall.g");`.
gap> ReadPackage(
"Alnuth",
"tst/testinstall.g");
Architecture: aarch64-apple-darwin21.
4.
0-default64-kv8
testing: GAPROOT/pkg/alnuth/tst/ALNUTH.tst
66 ms (
33 ms GC)
and 11.
0MB allocated
for GAPROOT/pkg/alnuth/tst/ALNUTH.tst
testing: GAPROOT/pkg/alnuth/tst/version.tst
21 ms (
21 ms GC)
and 29.
6KB allocated
for GAPROOT/pkg/alnuth/tst/version.tst
-----------------------------------
total
87 ms (
54 ms GC)
and 11.
0MB allocated
0 failures
in 2 files
#I No errors detected
while testing
If the test suite runs into an error
in the first part, which verifies the
availability
of PARI/GP, check your installation
of PARI/GP
and consult the
last chapter
of the documentation
of Alnuth
for more information.
Contact
=======
If you find any bugs
or have any suggestions
or comments, we would very much
appreciate it
if you would let us know by submitting an issue at the Alnuth
issue tracker on GitHub <https:
//github.com/gap-packages/alnuth/issues> or by
writing an mail
to <support@gap-system.org>.