numpy.polyadd

numpy.polyadd(a1, a2)

Find the sum of two polynomials.

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, a2 : array_like or poly1d object

Input polynomials.

Returns :

out : ndarray 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

poly1d

A one-dimensional polynomial class.

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

Examples

>>> 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