numpy.polynomial.legendre.leg2poly — NumPy v1.13 Manual (original) (raw)
numpy.polynomial.legendre. leg2poly(c)[source]¶
Convert a Legendre series to a polynomial.
Convert an array representing the coefficients of a Legendre 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 Legendre 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
c = P.Legendre(range(4)) c Legendre([ 0., 1., 2., 3.], [-1., 1.]) p = c.convert(kind=P.Polynomial) p Polynomial([-1. , -3.5, 3. , 7.5], [-1., 1.]) P.leg2poly(range(4)) array([-1. , -3.5, 3. , 7.5])