MATLAB Function Reference |

**Syntax**

**Description**

```
A = compan(u)
```

returns the corresponding companion matrix whose first row is `-u(2:n)/u(1)`

, where `u`

is a vector of polynomial coefficients. The eigenvalues of `compan(u)`

are the roots of the polynomial.

**Examples**

The polynomial

has a companion matrix given by

The eigenvalues are the polynomial roots:

**See Also**

comet3 | compass |