numpy.polynomial.chebyshev.chebsub(c1, c2)
[source]
Subtract one Chebyshev series from another.
Returns the difference of two Chebyshev series c1
 c2
. The sequences of coefficients are from lowest order term to highest, i.e., [1,2,3] represents the series T_0 + 2*T_1 + 3*T_2
.
Parameters: 


Returns: 

Unlike multiplication, division, etc., the difference of two Chebyshev series is a Chebyshev series (without having to “reproject” the result onto the basis set) so subtraction, just like that of “standard” polynomials, is simply “componentwise.”
>>> from numpy.polynomial import chebyshev as C >>> c1 = (1,2,3) >>> c2 = (3,2,1) >>> C.chebsub(c1,c2) array([2., 0., 2.]) >>> C.chebsub(c2,c1) # C.chebsub(c1,c2) array([ 2., 0., 2.])
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https://docs.scipy.org/doc/numpy1.17.0/reference/generated/numpy.polynomial.chebyshev.chebsub.html