NumPy参考 >例行程序 >Polynomials >Polynomial Package >Legendre Module (numpy.polynomial.legendre) > numpy.polynomial.legendre.legmul
numpy.polynomial.legendre.
legmul
(c1, c2)[source]¶Multiply one Legendre series by another.
Returns the product of two Legendre series c1 * c2. The arguments
are sequences of coefficients, from lowest order “term” to highest,
e.g., [1,2,3] represents the series P_0 + 2*P_1 + 3*P_2
.
1-D arrays of Legendre series coefficients ordered from low to high.
Of Legendre series coefficients representing their product.
Notes
In general, the (polynomial) product of two C-series results in terms that are not in the Legendre polynomial basis set. Thus, to express the product as a Legendre series, it is necessary to “reproject” the product onto said basis set, which may produce “unintuitive” (but correct) results; see Examples section below.
Examples
>>> from numpy.polynomial import legendre as L
>>> c1 = (1,2,3)
>>> c2 = (3,2)
>>> L.legmul(c1,c2) # multiplication requires "reprojection"
array([ 4.33333333, 10.4 , 11.66666667, 3.6 ]) # may vary