Dear GAP people,
the command LLLReducedGramMat is supposed to perform the LLL reduction
algorithm for symmetric square matrices. Most of the time I'm satisfied
with the output, but now I ran into the following:
M:=
[ [ 4, 1, 1, 1, 8 ],
[ 1, 2, 2, 2, 2 ],
[ 1, 2, 2, 2, 2 ],
[ 1, 2, 2, 2, 2 ],
[ 8, 2, 2, 2, 4 ] ];
LLLReducedGramMat(M);
Error, List Element: <list>[2] must have an assigned value
The matrix M is symmetric, but not invertible. However, this is
certainly not the problem here, since even a zero matrix gives no error.
It seems to me that there is a very subtle detail strongly related to
this matrix which goes wrong. Btw, I'm using GAP 4.7.8 under linux.
Best wishes,
Benjamin
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