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polysub(a1, a2)

note

This forms part of the old polynomial API. Since version 1.4, the new polynomial API defined in :None:None:`numpy.polynomial` is preferred. A summary of the differences can be found in the :None:doc:`transition guide </reference/routines.polynomials>`.

Given two polynomials :None:None:`a1` and :None:None:`a2`, returns a1 - a2 . :None:None:`a1` and :None:None:`a2` can be either array_like sequences of the polynomials' coefficients (including coefficients equal to zero), or poly1d objects.

Parameters

a1, a2 : array_like or poly1d: Minuend and subtrahend polynomials, respectively.

Returns

out : ndarray or poly1d: Array or poly1d object of the difference polynomial's coefficients.

Difference (subtraction) of two polynomials.

Examples

$$(2 x^2 + 10 x - 2) - (3 x^2 + 10 x -4) = (-x^2 + 2)$$

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

See :

Back References

The following pages refer to to this document either explicitly or contain code examples using this.

numpy.polynomial.polynomial.polymul numpy.polynomial.polynomial.polypow numpy.polymul numpy.polynomial.polynomial.polymulx numpy.polydiv numpy.polynomial.polynomial.polydiv numpy.polyadd numpy.polynomial.polynomial.polyadd

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GitHub : /numpy/lib/polynomial.py#855
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