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), orpoly1d
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.
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])