That worked perfectly! Thank guys.
On Oct 29, 1:39 am, William Stein <[email protected]> wrote:
> On Wed, Oct 28, 2009 at 9:08 PM, Jo <[email protected]> wrote:
>
> > Hi,
>
> > I need to replace some part of a matrix with an another matrix. I
> > tried to use matrix.set_block, but I got an error. I tried few other
> > alternative, but they returned all the same error:
>
> > "TypeError: unable to convert x (=sin(t1)) to an integer"
>
> > I made up a very simple example of a code that actually cause the
> > error:
>
> > t1=var('t1');
> > m1=Matrix([[sin(t1)]]);
> > m2=Matrix([[0]]);
> > m2[0,0]=m1[0,0]; #error happen here.
> > m2;
>
> > Can anyone tell me what i'm doing wrong? Or did I just ended up in a
> > bug....
>
> Try
>
> m2=Matrix(SR, [[0]]);
>
> Here SR = "symbolic ring". All entries of a matrix belong to the
> same ring. Your m2 above has entries that are all integers, which is
> the smallest ring that contains 0.
>
> William
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