65 GUAVA

GUAVA is a share library package that implements coding theory algorithms in GAP. Codes can be created and manipulated and information about codes can be calculated.

GUAVA consists of various files written in the GAP language, and an external program from J.S.~Leon for dealing with automorphism groups of codes and isomorphism testing functions. Several algorithms that need the speed are integrated in the GAP kernel. Please send your bug reports to the gap-forum (GAP-Forum@Math.RWTH-Aachen.DE).

GUAVA is written as a final project during our study of Mathematics at the Delft University of Technology, department of Pure Mathematics, and in Aachen, at Lehrstuhl D fuer Mathematik.

We would like to thank the GAP people at the RWTH Aachen for their support, A.E.~Brouwer for his advice and J.~Simonis for his supervision.

Jasper Cramwinckel,
Erik Roijackers, and
Reinald Baart.

Delft University of Technology
Faculty of Technical Mathematics and Informatics
Department of Pure Mathematics

As of version~1.3, new functions are added. These functions are also written in Delft as a final project during my study of Mathematics. For more information, see Extensions to GUAVA.

Eric Minkes.

The following sections describe the functions of the GUAVA (Version~1.3) share libary package for computing with codes. All functions described here are written entirely in the GAP language, except for the automorphism group and isomorphism testing functions, which make use of J.S.~Leon's partition backtrack programs.

GUAVA is primarily designed for the construction and analysis of codes. The functions can be divided into three subcategories:

Construction of codes:: GUAVA can construct unrestricted, linear and cyclic codes. Information about the code is stored in a record, together with operations applicable to the code.

Manipulations of codes:: Manipulation transforms one code into another, or constructs a new code from two codes. The new code can profit from the data in the record of the old code(s), so in these cases calculation time decreases.

Computations of information about codes:: GUAVA can calculate important data of codes very fast. The results are stored in the code record.

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GAP 3.4.4
April 1997