# companion

Version:

Returns the companion matrix to a polynomial.

## Syntax

c = companion(a)
Legacy name: compan

## a

Coefficients of a polynomial in descending order of power. The first element in a is the leading coefficient of the polynomial, which is 1 for a monic polynomial. Therefore, an input vector of size n produces a companion matrix of size (n-1)-by-(n-1). a is a vector.

## c

Companion matrix of a. The size of c equals the order of a.

A = [1, 2, 3, 4]
C = companion(A)

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Desktop OS: Windows

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