[SciPy-dev] band matrix wrapping ready for inclusion

Arnd Baecker arnd.baecker at web.de
Fri Jun 30 08:25:24 CDT 2006


On Fri, 30 Jun 2006, Nils Wagner wrote:

[...]

> Did you check general band matrices ?

No.

> If you need a test for real nonsymmetric band matrices

Not this time - the wrapped routines are for symmetric or
Hermetian routines only.

> from scipy import linalg, diag, arange, linspace, sort
> def sylvester(n):
> #
> #  Sylvester matrix
> #
>    tmp = diag(arange(1,n),1)+diag(arange(n-1,0,-1),-1)
>    return tmp
>
> n = 9
> A = sylvester(n)
> w1=linalg.eigvals(A)
> w1=sort(w1.real)
> #
> # Exact eigenvalues
> #
> w_ex = linspace(-(n-1),n-1,n,endpoint=True)
> print linalg.norm(w1-w_ex)
>
> Nils
>
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>


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