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polymul(a1, a2)

note

This forms part of the old polynomial API. Since version 1.4, the new polynomial API defined in :None:None:`numpy.polynomial` is preferred. A summary of the differences can be found in the :None: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.

Find the product of two polynomials.

Examples

>>> 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

See :

Back References

The following pages refer to to this document either explicitly or contain code examples using this.

numpy.polynomial.polynomial.polypow numpy.polynomial.polynomial.polysub scipy.signal._signaltools.convolve numpy.polynomial.polynomial.polymulx numpy.polydiv numpy.polynomial.polynomial.polydiv numpy.polysub numpy.polynomial.polynomial.polyadd numpy.convolve

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GitHub : /numpy/lib/polynomial.py#909
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