numpy.polynomial.polynomial.polycompanion#
- polynomial.polynomial.polycompanion(c)[source]#
Return the companion matrix of c.
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:
- carray_like
1-D array of polynomial coefficients ordered from low to high degree.
- Returns:
- matndarray
Companion matrix of dimensions (deg, deg).
Notes
New in version 1.7.0.
Examples
>>> from numpy.polynomial import polynomial as P >>> c = (1, 2, 3) >>> P.polycompanion(c) array([[ 0. , -0.33333333], [ 1. , -0.66666667]])