Convert a polynomial to a Legendre 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 Legendre 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(np.arange(4)) >>> p Polynomial([ 0., 1., 2., 3.], [-1., 1.]) >>> c = P.Legendre(P.poly2leg(p.coef)) >>> c Legendre([ 1. , 3.25, 1. , 0.75], [-1., 1.])