numpy.polyadd — NumPy v2.2 Manual (original) (raw)

numpy.polyadd(a1, a2)[source]#

Find the sum 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 thetransition guide.

Returns the polynomial resulting from the sum of two input polynomials. Each input must be either a poly1d object or a 1D sequence of polynomial coefficients, from highest to lowest degree.

Parameters:

a1, a2array_like or poly1d object

Input polynomials.

Returns:

outndarray or poly1d object

The sum of the inputs. If either input is a poly1d object, then the output is also a poly1d object. Otherwise, it is a 1D array of polynomial coefficients from highest to lowest degree.

Examples

import numpy as np np.polyadd([1, 2], [9, 5, 4]) array([9, 6, 6])

Using poly1d objects:

p1 = np.poly1d([1, 2]) p2 = np.poly1d([9, 5, 4]) print(p1) 1 x + 2 print(p2) 2 9 x + 5 x + 4 print(np.polyadd(p1, p2)) 2 9 x + 6 x + 6