`numpy.polynomial.laguerre:lagmulx`

Signature

def lagmulx(c)

Multiply a Laguerre series by x.

Multiply the Laguerre series c by x, where x is the independent variable.

c : array_like: 1-D array of Laguerre series coefficients ordered from low to high.

The multiplication uses the recursion relationship for Laguerre polynomials in the form

x P_{i} (x) = (- (i + 1) * P_{i + 1} (x) + (2 i + 1) P_{i} (x) - i P_{i - 1} (x))

from numpy.polynomial.laguerre import lagmulx

✓

lagmulx([1, 2, 3])

✗

array([-1., -1., 11., -9.])