numpy.polynomial.chebyshev.chebmul¶

numpy.polynomial.chebyshev.
chebmul
(c1, c2)[源代码]¶ Multiply one Chebyshev series by another.
Returns the product of two Chebyshev series c1 * c2. The arguments are sequences of coefficients, from lowest order “term” to highest, e.g., [1,2,3] represents the series
T_0 + 2*T_1 + 3*T_2
.Parameters:  c1, c2 : array_like
1D arrays of Chebyshev series coefficients ordered from low to high.
Returns:  out : ndarray
Of Chebyshev series coefficients representing their product.
Notes
In general, the (polynomial) product of two Cseries results in terms that are not in the Chebyshev polynomial basis set. Thus, to express the product as a Cseries, it is typically necessary to “reproject” the product onto said basis set, which typically produces “unintuitive live” (but correct) results; see Examples section below.
Examples
>>> from numpy.polynomial import chebyshev as C >>> c1 = (1,2,3) >>> c2 = (3,2,1) >>> C.chebmul(c1,c2) # multiplication requires "reprojection" array([ 6.5, 12. , 12. , 4. , 1.5])