I forgot to copy my reply to the list:
Thank you very much! It works.
Am 21.09.2010 12:51, schrieb Mathieu Dutour:
This is because when you add the element e, you actually add
a pointer to it. Hence you change the value but the pointer
does not change.
The trick is to do
Add(L, ShallowCopy(e));
which really does the addition that you want.
Dear GAP Forum,
consider this small GAP code (I hope it is minimal somehow):
L:=[];
e:=[1];
for s in [[1],[0]] do
e[1]:=s[1];
Add(L,e);
od;
After that the list L should be [ [ 1 ], [ 0 ] ]. However GAP gives [ [
0 ], [ 0 ] ]. I'm not quite sure if this is a bug. It seems to me that
the Add function only adds a pointer or something similar. Note that the
code works as expected if one uses e:=1 and so on (without additional
square brackets). By the way I'm using GAP 4.4.12.
Thanks for clarification,
Benjamin Sambale
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