numpy.polysub — NumPy v1.11 Manual (original) (raw)

numpy.polysub(a1, a2)[source]¶

Difference (subtraction) of two polynomials.

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, 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.

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])