Convert a polynomial to a Chebyshev series.
Convert an array representing the coefficients of a polynomial (relative to the “standard” basis) ordered from lowest degree to highest, to an array of the coefficients of the equivalent Chebyshev series, ordered from lowest to highest degree.
pol : array_like
c : ndarray
The easy way to do conversions between polynomial basis sets is to use the convert method of a class instance.
>>> from numpy import polynomial as P >>> p = P.Polynomial(range(4)) >>> p Polynomial([ 0., 1., 2., 3.], [-1., 1.]) >>> c = p.convert(kind=P.Chebyshev) >>> c Chebyshev([ 1. , 3.25, 1. , 0.75], [-1., 1.]) >>> P.poly2cheb(range(4)) array([ 1. , 3.25, 1. , 0.75])