numpy.polynomial.chebyshev.poly2cheb#
- 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
- polarray_like
1-D array containing the polynomial coefficients
- Returns
- cndarray
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.chebyshev.poly2cheb(range(4)) array([1. , 3.25, 1. , 0.75])