NumPy参考 >例行程序 >Polynomials >Polynomial Package >拉盖尔模块(numpy.polynomial.laguerre) > numpy.polynomial.laguerre.lagmulx
numpy.polynomial.laguerre.
lagmulx
(c)[source]¶Multiply a Laguerre series by x.
Multiply the Laguerre series c by x, where x is the independent variable.
1-D array of Laguerre series coefficients ordered from low to high.
Array representing the result of the multiplication.
Notes
The multiplication uses the recursion relationship for Laguerre polynomials in the form
xP_i(x) = (-(i + 1)*P_{i + 1}(x) + (2i + 1)P_{i}(x) - iP_{i - 1}(x))
Examples
>>> from numpy.polynomial.laguerre import lagmulx
>>> lagmulx([1, 2, 3])
array([-1., -1., 11., -9.])