numpy.polysub

numpy.polysub(a1, a2)

Difference (subtraction) of two polynomials.

備註

這是舊版多項式 API 的一部分。自 1.4 版本起，建議使用 numpy.polynomial 中定義的新版多項式 API。有關差異的概述，請參閱 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.

參數:

a1, a2array_like or poly1d

Minuend and subtrahend polynomials, respectively.

回傳值:

outndarray 或 poly1d

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

也參考

polyval, polydiv, polymul, polyadd

範例

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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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