numpy.polynomial.chebyshev.cheb2poly — NumPy v1.15 Manual (original) (raw)
numpy.polynomial.chebyshev. cheb2poly(c)[source]¶
Convert a Chebyshev series to a polynomial.
Convert an array representing the coefficients of a Chebyshev series, ordered from lowest degree to highest, to an array of the coefficients of the equivalent polynomial (relative to the “standard” basis) ordered from lowest to highest degree.
| Parameters: | c : array_like 1-D array containing the Chebyshev series coefficients, ordered from lowest order term to highest. |
|---|---|
| Returns: | pol : ndarray 1-D array containing the coefficients of the equivalent polynomial (relative to the “standard” basis) ordered from lowest order term to highest. |
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 c = P.Chebyshev(range(4)) c Chebyshev([ 0., 1., 2., 3.], [-1., 1.]) p = c.convert(kind=P.Polynomial) p Polynomial([ -2., -8., 4., 12.], [-1., 1.]) P.cheb2poly(range(4)) array([ -2., -8., 4., 12.])