[LON-CAPA-users] looking for linear algebra library

[Jay Sullivan]

So the perl interface only handles square matrices?

Maybe I will have to stick with the maxima interface for linear
algebra. I suppose for now I can author the resources on VCU and test
them with educog. Hopefully VCU will do an upgrade during the break.

JS

On Nov 20, 2007 12:09 PM, Guy Albertelli II <guy@albertelli.com> wrote:
> Hi Jay,
>
> > Thanks for the pointer. I think I will like using the maxima
> > interface. However, I'm stuck trying to figure out how to pass a
> > matrix from maxima into a perl variable.
>
> Of course if you used the perl interface you wouldn't need to parse
> the output:
>
> <problem>
> <script type="loncapa/perl">
>   $B = &mat([[10,0,0],[0,3,0],[0,0,1]])->inv()->coef();
>   $tmp = $B->[0][0];
> </script>
> $tmp
> </problem>
>
> :-)
>
>
> >
> > Based on the example below, from the output, it looks like maxima
> > received the correct matrix input and evaluated the inverse matrix
> > correctly. How could I assign the output of the &cas routine to a
> > multidimensional perl array? Any tips? Thanks.
> >
> > code:
> > <problem>
> > <script type="loncapa/perl">
> > $s= 'maxima';
> > @B = ();
> > $str = &cas($s,'invert(matrix([10,0,0],[0,3,0],[0,0,1]))');
> > $str=~s/matrix//;
> > @B = $str;
> > $tmp = $B[0][0];
> > </script>
> > $str<br/>
> > $tmp
> > </problem>
> >
> > output:
> > ([1/10,0,0],[0,1/3,0],[0,0,1])
> > $tmp
> >
> > JS
> >
> > On Nov 18, 2007 4:53 PM, Peter Riegler <p.riegler@fh-wolfenbuettel.de> wrote:
> > > Hi,
> > >
> > > loncapa provides access to maxima, a free computer algebra system.
> > > Maxima comes with all the functionalities you need here.
> > > You might want to have a look at the ressources at
> > > /res/fhwf/username/Mathematik/LineareAlgebra
> > > or
> > > /res/nds/username/Mathematik/LineareAlgebra
> > >
> > > Most of them are in German, but the source code should be available.
> > >
> > > Peter
> > >
> > >
> > > Jay Sullivan wrote:
> > >
> > > > Does anyone have a linear algebra perl library they would mind sharing?
> > > >
> > > > I'm looking for basic matrix functionality: matrix add, subtract,
> > > > multiply, determinant, inverse
> > > >
> > > > Thanks,
> > > > Jay
> > > > _______________________________________________
> > > > LON-CAPA-users mailing list
> > > > LON-CAPA-users@mail.lon-capa.org
> > > > http://mail.lon-capa.org/mailman/listinfo/lon-capa-users
> > >
> > > --
> > > Peter Riegler
> > > Fachhochschule Braunschweig/Wolfenb?ttel
> > > Salzdahlumer Str. 46/48, 38302 Wolfenb?ttel
> > > Tel. +49 5331 939 6314, Fax. +49 5331 939 6002
> > > email: p.riegler@fh-wolfenbuettel.de
> > > http://public.rz.fh-wolfenbuettel.de/~riegler
> > > _______________________________________________
> > > LON-CAPA-users mailing list
> > > LON-CAPA-users@mail.lon-capa.org
> > > http://mail.lon-capa.org/mailman/listinfo/lon-capa-users
> > >
> >
> > _______________________________________________
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>
> --
> guy@albertelli.com   0-7-0-6-27,137
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