On Mon, May 5, 2008 at 8:26 PM, Jerin Schneider
<[EMAIL PROTECTED]> wrote:
> It seems that every matrix I make is immutable. when I call
> matrix.immutable, it says it's not. But if I call matrix[3].immutable, it
> says it is immutable. So the matrix is not immutable, but the rows (or
> vectors) are?
Yes. Matrices are mutable by default but a copy of the row
is immutable. This is to make sure you *can't accidentaly do
sage: a = matrix(QQ, 2, [1..4])
sage: a[0][1] = 5
sage: a[0,1]
2
which is a good thing. Note matrices are *NOT* just lists
of rows, and that a[0] say does *not* give the first row of the
matrix. It gives a vector that equals the first row.
To set position 0,1 of a, do
sage: a[0,1] = 5
-- William
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