Dear Forum,
I've defined an action of a permutation group on a set of square
matrices in the following way:
act:=function(x,g)
local i;
for i in [1..Length(x[1])] do x[i]:=Permuted(x[i],g); od;
return Permuted(x,g);
end;
This works as expected, for example:
gap> act([[1,2],[3,4]],(1,2));
[ [ 4, 3 ], [ 2, 1 ] ]
However, using the Orbit command gives
gap> Orbit(Group((1,2)),[[1,2],[3,4]],act);
Lists Assignment: <list> must be a mutable list
What is wrong here?
Thanks,
Benjamin Sambale
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