Re: MATLAB shortcoming?

From: Zdislav V. Kovarik (kovarik_at_mcmaster.ca)
Date: 03/29/05 

Date: Tue, 29 Mar 2005 14:50:16 -0500

Thanks, I will look into it. So Macsyma lives.
Cheers, ZVK(Slavek).

On Mon, 28 Mar 2005, B Thomas wrote:

> You may want to use a symbolic algebra system for this
> type of thing as mentioned before.
> Two good free programs are
>
> Axiom : http://www.nongnu.org/axiom
> Maxima: http://maxima.sourceforge.net
>
> Zdislav V. Kovarik <kovarik@mcmaster.ca> wrote:
> > Hello, while preparing homework, I found with horror that MATLAB symbolic
> > package failed to distinguish
> >
> > -4*n*(n-1)*((x^2+y^2)^(n-2)*y^2-(x^2+y^2)^(n-1)+(x^2+y^2)^(n-2)*x^2)
> >
> > from zero, using "simplify", as well as using "simple". Here x, y, n were
> > declared symbolic before obtaining the expression.
> >
> > It did recognize the above expression as zero, after I had the program
> > divide it by (x^2+y^2)^(n-2).
> >
> > For more info: I was checking what the Laplace operator does to
> > (x^2+y^2)^n. The result is, as easily checked manually,
> > 4*n^2*(x^2+y^2)^(n-1).
> >
> > Any similar experiences, any advice?
> >
> > Cheers, ZVK(Slavek).
>

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