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Module « numpy.matlib »

Fonction polymul - module numpy.matlib

Signature de la fonction polymul

def polymul(a1, a2) 

Description

help(numpy.matlib.polymul)

Find the product 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>`.

Finds the polynomial resulting from the multiplication of the 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 polynomial resulting from the multiplication of the inputs. If
    either inputs 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
convolve : Array convolution. Same output as polymul, but has parameter
           for overlap mode.

Examples
--------
>>> import numpy as np
>>> np.polymul([1, 2, 3], [9, 5, 1])
array([ 9, 23, 38, 17,  3])

Using poly1d objects:

>>> p1 = np.poly1d([1, 2, 3])
>>> p2 = np.poly1d([9, 5, 1])
>>> print(p1)
   2
1 x + 2 x + 3
>>> print(p2)
   2
9 x + 5 x + 1
>>> print(np.polymul(p1, p2))
   4      3      2
9 x + 23 x + 38 x + 17 x + 3

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