On Nov 17, 2008, at 9:34 AM, Martin Mereb wrote:
>
> I'm trying to run the following:
>
> sage: n=3; q=7; G=SL(n,q)
> sage: for a in G:
> ....: print a
> ....:
>
> it just got stuck there, nothing shows up (for a looong while)
> this is Sage version 3.1.1
>
> and if I try the same with q=4 it works (but it takes some time to
> start)
> any ideas?
There's a Gap in your thinking. Or, at least, in your processing :-}
In this case (SL(n,q)), we ask Gap to produce the results. In both
cases (q=4,7), Gap is working pretty hard to come up with the
elements in the group (it does have 5.6 million elements, for q=7;
for q=4, it's ~60K). In any case, the time is being spent in Gap,
and it has nothing to do with 'for'.
If you start Gap (e.g., "sage -gap" in a shell window), and compute
either Elements(SL(3,7)) or AsList(SL(3,7)) (the latter presumably
being faster, but I didn't have the patience to wait :-}), you will
see what I mean.
HTH
Justin
--
Justin C. Walker, Curmudgeon-At-Large
Institute for the Absorption of Federal Funds
--------
Men are from Earth.
Women are from Earth.
Deal with it.
--------
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