Hello,
I am trying to use the cvec package to have compressed matrices over GF(2).
But I do not see much difference - see below example log from my GAP
session.
I have installed newest GAP 4.7.5. I have 8 GB memory and system Windows 7
(64-bit). I have read in cvec package documentation that I should recompile
or configure it ... "For example you have to specify 32-bit or 64-bit mode
correctly!". But I don't know how to do it.
Regards,
Marek
gap> g:=AtlasGroup("B"); Print("Baby defined\n");
<matrix group of size 4154781481226426191177580544000000 with 2 generators>
Baby defined
gap> ge:=GeneratorsOfGroup(g); a:=ge[1]; b:=ge[2];
[ <an immutable 4370x4370 matrix over GF2>, <an immutable 4370x4370 matrix
over GF2> ]
<an immutable 4370x4370 matrix over GF2>
<an immutable 4370x4370 matrix over GF2>
gap>
gap> LoadPackage("cvec"); # compressed vectors and matrices over finite
fields
true
gap> ca:=CMat(a); cb:=CMat(b);
<cmat 4370x4370 over GF(2,1)>
<cmat 4370x4370 over GF(2,1)>
gap>
gap> MemoryUsage(a);
2519320
gap> MemoryUsage(ca);
2500728
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