`numpy.polynomial.polynomial:polycompanion`

source: build-install/usr/lib/python3.14/site-packages/numpy/polynomial/polynomial.py :1448

Signature

def polycompanion ( c )

Summary

Return the companion matrix of c.

Extended Summary

The companion matrix for power series cannot be made symmetric by scaling the basis, so this function differs from those for the orthogonal polynomials.

Parameters

c : array_like: 1-D array of polynomial coefficients ordered from low to high degree.

Returns

mat : ndarray: Companion matrix of dimensions (deg, deg).

Examples

from numpy.polynomial import polynomial as P
c = (1, 2, 3)

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P.polycompanion(c)

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Aliases

numpy.polynomial.polynomial.polycompanion