This is documentation for an old release of NumPy (version 1.15.1). Read this page in the documentation of the latest stable release (version > 1.17).
numpy.polynomial.chebyshev.poly2cheb¶
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numpy.polynomial.chebyshev.
poly2cheb
(pol)[source]¶ 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.
Parameters: - pol : array_like
1-D array containing the polynomial coefficients
Returns: - c : ndarray
1-D array containing the coefficients of the equivalent Chebyshev series.
See also
Notes
The easy way to do conversions between polynomial basis sets is to use the convert method of a class instance.
Examples
>>> from numpy import polynomial as P >>> p = P.Polynomial(range(4)) >>> p Polynomial([ 0., 1., 2., 3.], domain=[-1, 1], window=[-1, 1]) >>> c = p.convert(kind=P.Chebyshev) >>> c Chebyshev([ 1. , 3.25, 1. , 0.75], domain=[-1, 1], window=[-1, 1]) >>> P.poly2cheb(range(4)) array([ 1. , 3.25, 1. , 0.75])