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Module « numpy.matlib »

Fonction polyadd - module numpy.matlib

Signature de la fonction polyadd

def polyadd(a1, a2) 

Description

help(numpy.matlib.polyadd)

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 the
   :doc:`transition guide </reference/routines.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
--------
>>> 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

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