numpy.polynomial.chebyshev.chebmul(c1, c2)
[source]
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: 


Returns: 

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.
>>> 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])
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https://docs.scipy.org/doc/numpy1.17.0/reference/generated/numpy.polynomial.chebyshev.chebmul.html