`numpy.polynomial.chebyshev:chebsub`

source: build-install/usr/lib/python3.14/site-packages/numpy/polynomial/chebyshev.py :609

Signature

def chebsub ( c1 , c2 )

Summary

Subtract one Chebyshev series from another.

Extended Summary

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

c1, c2 : array_like: 1-D arrays of Chebyshev series coefficients ordered from low to high.

Returns

out : ndarray: Of Chebyshev series coefficients representing their difference.

Notes

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 "component-wise."

Examples

from numpy.polynomial import chebyshev as C
c1 = (1,2,3)
c2 = (3,2,1)
C.chebsub(c1,c2)
C.chebsub(c2,c1) # -C.chebsub(c1,c2)

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Aliases

numpy.polynomial.Chebyshev._sub
numpy.polynomial.chebyshev.chebsub