numpy.polyadd(a1, a2)[source]

Find the sum of two polynomials.


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.

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.

a1, a2array_like or poly1d object

Input polynomials.

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.

See also


A one-dimensional polynomial class.

poly, polyadd, polyder, polydiv, polyfit, polyint, polysub, polyval


>>> 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)
9 x + 5 x + 4
>>> print(np.polyadd(p1, p2))
9 x + 6 x + 6