Evaluate a Legendre series.
If cs is of length n, this function returns :
p(x) = cs[0]*P_0(x) + cs[1]*P_1(x) + ... + cs[n-1]*P_{n-1}(x)
If x is a sequence or array then p(x) will have the same shape as x. If r is a ring_like object that supports multiplication and addition by the values in cs, then an object of the same type is returned.
Parameters : | x : array_like, ring_like
cs : array_like
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Returns : | values : ndarray, ring_like
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See also
Notes
The evaluation uses Clenshaw recursion, aka synthetic division.