[GAP Forum] Problem with TransposedMat

Gábor Nagy nagyg at math.u-szeged.hu
Thu Jul 5 07:38:49 BST 2007


Dear Forum,

When trying to transpose large matrices with TransposedMat(), GAP4 often 
runs out of memory, even if I start it with a workspace size of 300M.

The matrices we have been working were:

a) approx. 16.000 x 15.000 binary matrix over GF(2), and

b) 6.500 x 6.500 square matrix with elements from [1..6500].

Then we wrote some trivial function to invert the matrix simply using 
for-do cycles and it was no problem for GAP.

Can anybody explain this behaviour?

Thank you in advance,

Gabor Nagy



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