Thank you!
On Jun 20, 11:41 am, "didier deshommes" <[EMAIL PROTECTED]> wrote:
> On 6/20/07, Marshall Hampton <[EMAIL PROTECTED]> wrote:
>
> > I now want to do some loops and update certain entries of the matrix.
> > But the entries seem immutable, e.g. one can do:
>
> > my_matrix[0][0] += 1
>
> > and the entry is still zero, although no exception seems to be raised.
>
> > So my question is, how can one manipulate individual matrix entries?
>
> To update entries, you should use the [i,j] notation instead of [i][j]:
> {{{
> sage: my_matrix = matrix(3,10, [0r for x in range(30)])
> sage: my_matrix[0,0]=1
> sage: my_matrix
> [1 0 0 0 0 0 0 0 0 0]
> [0 0 0 0 0 0 0 0 0 0]
> [0 0 0 0 0 0 0 0 0 0]
>
> }}}
>
> I don't know why you can use one notation and not the other but I'm
> sure theare are more knowledgeable Matrix people here :)
>
> didier
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