> I mean for example:
>
> A = matrix(QQ,[[1,2,3],[4,5,6],[7,8,9]])
> A.submatrix([1,3],[1,3])
> ==> [1,3]
> [7,9]
With a slightly different syntax, we can do this by passing a tuple of
values for the coordinates:
sage: A = matrix(QQ,[[1,2,3],[4,5,6],[7,8,9]])
sage: A
[1 2 3]
[4 5 6]
[7 8 9]
Hi Sage-Team,
I have an idea, what might be useful for Sage. There is the command
submatrix, which gets a starting column and a starting row and the
number of columns and rows that you want to have for that submatrix
after the starting point. Wouldn't it be more useful, if you could
decide which r
