John Cremona:
>
> What is the simplest way to do this. I have a matrix M (square and
> over ZZ, but that is not so important). I want to make another matric
> of the same size & base. I have not explicitly constructed the
> associated matrix space, but I know that I can get it wth M.parent(),
> so doing newM = M.parent()(0) would work, but is there something
> more natural?
>
If m is a matrix and p is a list of column indices, do
m.matrix_from_columns(p)
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