[SciPy-dev] RFR: fixing scipy.special.orthogonal

[Pauli Virtanen]

Hi,

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.

This patch adds separate vectorized eval_* routines for them.

What is more controversial, it also hooks these routines in orthopoly1d,
so that

	>>> special.chebyt(100)(0.98)
	0.37728975480815219

instead of the current

	>>> special.chebyt(100)(0.98)
	-5.2908451051968135e+20

Any arithmetic on the returned polynomial objects, however, discards the
stabler evaluation routines. (Maybe when the scipy/scikits.polynomial
stuff gets ready, we can address also this.)

Comments? Good to go in?

-- 
Pauli Virtanen