Yo !
> Ah, seems to be quite a compact form!
Yeah, but it only does what you want. Nothing involving more
complicated objects like category functions do.
> But after two days of wondering I don't know how to generate all lower
> triangular matrices with non-zero elements taken from, say, [0,1]. For all
> matrices it seems simple:
Try to understand how that works then:
from itertools import product
n = 3
S = [-1,1]
for m in product(*[S if i>=j else [0] for i in range(n) for j in range(n)]):
m = Matrix(n,n,m)
print m.str()
>
> N=3; v=[0,1];
> p=product(product(v, repeat=N), repeat=N)
> print matrix(ZZ, p.next())
> print matrix(ZZ, p.next())
> . . .
>
>
>> P.S. : Sage is open source: when you hate something, come and change it.
>
>
> It's not always possible. Or what_to_do to DifferentNamingStyles like
> KleinFourGroup vs. is_isomorphic?
>
> --
> Jori Mäntysalo
>
>
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