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. |
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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. |
See also
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 >>> 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.])
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https://docs.scipy.org/doc/numpy-1.12.0/reference/generated/numpy.polynomial.chebyshev.cheb2poly.html