numpy.polysub

numpy.polysub(a1, a2)[source]

Difference (subtraction) of two polynomials.

Note

This forms part of the old polynomial API. Since version 1.4, the new polynomial API defined in numpy.polynomial is preferred. A summary of the differences can be found in the transition guide.

Given two polynomials a1 and a2, returns a1 - a2. a1 and a2 can be either array_like sequences of the polynomials’ coefficients (including coefficients equal to zero), or poly1d objects.

Parameters:

a1, a2array_like or poly1d

Minuend and subtrahend polynomials, respectively.

Returns:

outndarray or poly1d

Array or poly1d object of the difference polynomial’s coefficients.

See also

polyval, polydiv, polymul, polyadd

Examples

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\[(2 x^2 + 10 x - 2) - (3 x^2 + 10 x -4) = (-x^2 + 2)\]

>>> import numpy as np

>>> np.polysub([2, 10, -2], [3, 10, -4])
array([-1,  0,  2])

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