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# The ACE package
The ACE package provides functions associated
with Todd-Coxeter coset
enumeration by interfacing
with the Advanced Coset Enumerator (ACE),
ACE coset enumerator (C)
1995-
2001 by George Havas
and Colin Ramsay
<http:
//staff.itee.uq.edu.au/havas>
from within GAP
4.
The GAP
interface (package) has been written by Alexander Hulpke
and Greg
Gamble.
In order
to install the ACE package you must get the archive
file
e.g. `ace-XXX.tar.gz`,
for some version number `XXX`, (which includes the C
source code
of Havas
and Ramsay).
The ACE package provides a mechanism
to replace GAP
's usual Todd-Coxeter
coset enumerator by ACE, so that functions that behind the scenes use coset
enumeration will use the ACE enumerator. The ACE enumerator may also be used
explicitly; both non-interactively
and interactively. However the package
is
used, a plethora
of options
and strategies are available
to assist the
user
in avoiding incomplete coset enumerations.
You can download `ace-XXX.tar.gz` (where `XXX`
is the package version
number) from the home page
for the ACE package
https:
//gap-packages.github.io/ace/
or via the GAP web site
https:
//www.gap-system.org/Packages/ace.html
If you prefer .zip
or tar.bz2
to tar.gz archives, substitute the appropriate
suffix
in the above paths.
Since the ACE package interfaces
to an external binary, it
is only usable
in
an environment that supports compiling
of the binary, e.g. a UNIX
or a
UNIX-like environment.
## Installing the ACE package
To install the ACE package, move the
file `ace-XXX.tar.gz` into the `pkg`
directory
in which you plan
to install ACE. Usually, this will be the
directory `pkg`
in the hierarchy
of your version
of GAP
4. (However, it
is
also possible
to keep an additional `pkg` directory
in your
private
directories, see section
"ref:Installing GAP Packages" of the GAP
4
reference manual
for details on how
to do this.)
Then unpack `ace-XXX.tar.gz`, which
in most Linux environments can be done
by
tar zxf ace-XXX.tar.gz
Go
to the newly created `ace` directory
and call `configure <path>` where
<path>
is the path
to the GAP home directory. So
for example
if you install
the package
in the main `pkg` directory call
./configure ../..
In fact `../..`
is the default path. So,
if this
is correct, you may omit
it. This will fetch the architecture
type for which GAP has been compiled
last
and create a `Makefile`. Now simply call
make
to compile the binary
and to install it
in the appropriate place.
Note that the current version
of the configuration process only sets up
directory paths.
If you need a different compiler
or different compiler
options, you need
to edit `src/Makefile` prior
to calling `make`
yourself.
If you use this installation
of GAP on different hardware platforms you
will have
to compile the binary
for each platform separately. This
is
done by calling `configure`
and `make`
for the package anew immediately
after compiling GAP itself
for the respective architecture.
If your
version
of GAP
is already compiled (
and has last been compiled on the
same architecture) you
do not need
to compile GAP again, it
is sufficient
to call the `configure` script
in the GAP home directory.
That
's it. Now start GAP and type
LoadPackage(
"ace");
The ACE banner should appear on the screen.
For details on how
to use the ACE package see the package documentation
in the `doc` subdirectory (view either `manual.dvi` via `xdvi`
or
`manual.ps` via `ghostview`
or `manual.pdf` via a PDF viewer), which
gives information on how
to use ACE from within GAP. The ACE user manual
(`ace3001.ps`
or `ace3001.pdf`)
in the `standalone-doc` directory,
explains how
to use the ACE binary (i.e. the C
program that
is interfaced
with by the package from within GAP)
as a stand-alone.
The `src` subdirectory contains a copy
of the C source code
for ACE. The
only modification are those listed
in src/CHANGES.
In particular, the
the following bug was fixed on
25 February,
2001.
A bug was discovered
in ACE
3.
000 on
22 December,
2000 that was
particularly manifested by the Linux gcc compilers listed below. The bug
was reported
with fix by Volker Gebhardt (thanks!)
and caused a
segmentation fault when ACE output coset representatives. The fix
is
incorporated
in ACE
3.
001 which we now use.
ACE has been compiled successfully
with the following C compiler:
gcc version
4.
8.
4 (Ubuntu
4.
8.
4-
2ubuntu1~
14.
04.
1)
and is presumed
to compile
with any modern version
of C compiler.
If you encounter problems
with the ACE binary, please contact one
of the
C code authors: George Havas <havas@itee.uq.edu.au>
or Colin Ramsay
<cram@itee.uq.edu.au>.
If you encounter problems at the GAP level, please submit an issue
to
<https:
//github.com/gap-packages/ace/issues>
When sending a bug report, remember we will need
to be able
to reproduce
the problem; so please include:
* The version
of GAP you are using; either look at the header when
you start up GAP,
or at the gap> prompt
type: VERSION;
* The operating system you are using e.g. Linux, macOS, Windows, ...
* The compiler you used
to compile ACE
and the options you used.
Type: gcc -v
or: cc -version,
and look
in src/Makefile
for the
value
of CC
to find
out.
* A script, either
in GAP
or standalone ACE, that demonstrates the
bug, along
with a description
of why it
's a bug (e.g. by adding
comments
to the script - recall, comments, both
in GAP
or
standalone ACE,
begin with a #).