Re: MATLAB shortcoming?
From: Axel Vogt (nonail_at_axelvogt.de)
Date: 03/27/05
- Next message: Victor Eijkhout: "Re: Looking for gen symm sparse eigensolver in C or C++"
- Previous message: Julian V. Noble: "Re: question about polynomail interpolation"
- In reply to: Zdislav V. Kovarik: "MATLAB shortcoming?"
- Next in thread: B Thomas: "Re: MATLAB shortcoming?"
- Messages sorted by: [ date ] [ thread ]
Date: Sun, 27 Mar 2005 23:47:11 +0200
"Zdislav V. Kovarik" 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).
The symbolic machine is Maple (a specific newsgroup is
comp.soft-sys.math.maple) and for that is(%=0); returns
'true'.
-- use mail for mail not nonail
- Next message: Victor Eijkhout: "Re: Looking for gen symm sparse eigensolver in C or C++"
- Previous message: Julian V. Noble: "Re: question about polynomail interpolation"
- In reply to: Zdislav V. Kovarik: "MATLAB shortcoming?"
- Next in thread: B Thomas: "Re: MATLAB shortcoming?"
- Messages sorted by: [ date ] [ thread ]
Relevant Pages
|
|
