Josef,
If M is the n-by-m matrix, and L is the subset of [1..m], then you
can use:
TransposedMat(TransposedMat(M){L});
or, for a mutable version,
MutableTransposedMat(TransposedMat(M){L});
Note, you may obtaining the rows of M corresponding to L, by simply
using M{L}, if L is a subset of [1..n].
Best wishes,
-Shaun
Josef Lauri wrote:
Is there a function in GAP or one of its packages which, given an n
\times m matrix A and a subset lst of [1..m], returns the submatrix of A
obtained from the columns of A indexed by lst?
Thank you.
Josef Lauri
Department of Mathematics
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