BrauerCharacterValue( mtxmat )
returns the Brauer character value of the MeatAxe matrix mtxmat, which must of course be an invertible matrix of order relatively prime to the characteristic of its entries.
gap> g:= MeatAxeMat( (1,2,3,4,5), GF(2), [ 5, 5 ] );; gap> BrauerCharacterValue( g ); 0
(This program was originally written by Jaccent127 urgen Maccent127 uller.)
GAP 3.4.4