Here is another way:
sage: coeffs = [[i^2-j for j in range(6)] for i in range(6)]
sage: matrix(coeffs)
[ 0 -1 -2 -3 -4 -5]
[ 1 0 -1 -2 -3 -4]
[ 4 3 2 1 0 -1]
[ 9 8 7 6 5 4]
[16 15 14 13 12 11]
[25 24 23 22 21 20]
On Sat, Mar 13, 2010 at 7:58 AM, Alasdair <amc...@gmail.com> wrote:
> This can be done in maxima:
>
> genmatrix(lambda([i,j],i-j),6,6);
>
> for example. But is there an easy Sage way of doing this? If I enter
>
> sage: M=maxima('genmatrix(lambda([i,j],i-j),6,6)')
>
> then I obtain a Maxima matrix, which then has to turned into a Sage
> matrix (I don't know how to do this either). Clearly I could:
>
> sage: M=matrix(ZZ,6,6)
> sage: for i in range(6):
> ....: for j in range(6):
> ....: M[i,j]=i-j
>
> but that seems a bit longwinded. Is there an easy straightforward
> way?
>
> Thanks,
> Alasdair
>
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