numpy.polynomial.laguerre.lagsub

numpy.polynomial.laguerre.lagsub(c1, c2)

Subtract one Laguerre series from another.

Returns the difference of two Laguerre series c1 - c2. The sequences of coefficients are from lowest order term to highest, i.e., [1,2,3] represents the series P_0 + 2*P_1 + 3*P_2.

Parameters :

c1, c2 : array_like

1-D arrays of Laguerre series coefficients ordered from low to high.

Returns :

out : ndarray

Of Laguerre series coefficients representing their difference.

See also

lagadd, lagmul, lagdiv, lagpow

Notes

Unlike multiplication, division, etc., the difference of two Laguerre series is a Laguerre series (without having to “reproject” the result onto the basis set) so subtraction, just like that of “standard” polynomials, is simply “component-wise.”

Examples

>>> from numpy.polynomial.laguerre import lagsub
>>> lagsub([1, 2, 3, 4], [1, 2, 3])
array([ 0.,  0.,  0.,  4.])