[SciPy-dev] RFR: fixing scipy.special.orthogonal
Charles R Harris
Sun Oct 25 21:21:29 CDT 2009
On Sun, Oct 25, 2009 at 7:37 PM, Pauli Virtanen <firstname.lastname@example.org> wrote:
> su, 2009-10-25 kello 19:23 -0600, Charles R Harris kirjoitti:
> > On Sun, Oct 25, 2009 at 6:56 PM, Pauli Virtanen <email@example.com> wrote:
> > http://codereview.appspot.com/140053
> > The orthogonal polynomial routines in scipy.special.orthogonal
> > are
> > cumbersome to use if you only want *values* of the polynomials
> > at a few
> > points.
> > I'm not familiar with these routines. In what way is the evaluation at
> > a few points cumbersome?
> They IIRC compute polynomial roots via eigenvalues of the companion
> matrix, so chebyt(1000)(x) takes ages, and it's not blazingly fast for
> smaller n either.
Ah, that's right. Pretty much anything would be an improvement there.
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