Dear Forum,
How can I avoid getting an error when trying to convert
a block matrix to an ordinary one in the following example?
If I enter "return;" in the break loop, I get a "segmentation fault"
followed by a crash of GAP session.
Thank you.
Anvita
z:=Z(4);
bm:=BlockMatrix(
[[1,1,[[z]]],
[2,2,[[z]]]],2,2);
Display(bm);
MatrixByBlockMatrix(bm);
gap> z:=Z(4);
Z(2^2)
gap>
gap> bm:=BlockMatrix(
> [[1,1,[[z]]],
> [2,2,[[z]]]],2,2);
<block matrix of dimensions (2*1)x(2*1)>
gap>
gap> Display(bm);
z = Z(4)
z^1 .
. z^1
gap>
gap> MatrixByBlockMatrix(bm);
Error, You cannot convert a locked vector compressed over GF(2) to GF(4) in
mat{[ (i - 1) * blockmat!.rpb + 1 .. i * blockmat!.rpb ]}{
[ (j - 1) * blockmat!.cpb + 1 .. j * blockmat!.cpb ]}
:= MatrixByBlockMatrix( block[3] ); called from
<function "unknown">( <arguments> )
called from read-eval loop at line 17 of *stdin*
You can `return;' to ignore the conversion
brk> return;
Segmentation fault (core dumped)
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