Hello Marek,
On 31 Jul 2014, at 11:36, Marek Mitros <ma...@mitros.org> wrote:
> 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.
Whatever will be the answer on the question above, you do not have to worry
much about the question below :) GAP for Windows is supplied with compiled
cvec binary, which is built using the 32-bit Cygwin installation. So you're
running the 32-bit version of GAP anyhow.
I have no information at the moment what will happen if one will install
64-bit version of Cygwin and compile GAP and some packages there - hopefully
it will work. If anyone would like to try, call these commands first:
./configure
make cygwin
and then to build some packages (with kernel modules) call
cd pkg/Browse
./configure
make
cd ..
cd cvec-*
./configure
make
cd ..
cd edim
./configure
make
cd ..
cd io-*
./configure
make
cd ..
cd orb-*
./configure
make
Best wishes
Alexander
>
> 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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