numpy.polynomial.legendre.poly2leg — NumPy v2.2 Manual (original) (raw)

polynomial.legendre.poly2leg(pol)[source]#

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.

Parameters:

polarray_like

1-D array containing the polynomial coefficients

Returns:

cndarray

1-D array containing the coefficients of the equivalent Legendre series.

Notes

The easy way to do conversions between polynomial basis sets is to use the convert method of a class instance.

Examples

import numpy as np from numpy import polynomial as P p = P.Polynomial(np.arange(4)) p Polynomial([0., 1., 2., 3.], domain=[-1., 1.], window=[-1., 1.], ... c = P.Legendre(P.legendre.poly2leg(p.coef)) c Legendre([ 1. , 3.25, 1. , 0.75], domain=[-1, 1], window=[-1, 1]) # may vary