# roots

Find polynomial roots.

## 📝 Syntax

* r = roots(p)

## 📥 Input argument

* p - vector: polynomial coefficients

## 📤 Output argument

* r - roots

## 📄 Description

r = roots(c) finds the roots of the polynomial c.r is a column vector.

This function uses the companion matrix of the polynomial to find the roots.

## 💡 Example

```matlab

p = [1 0 0 0 -1];
r = roots(p)
```

## 🔗 See also

[poly](https://nelson-9.gitbook.io/nelson/markdown/en/polynomial_functions/poly).

## 🕔 History

| Version | 📄 Description  |
| ------- | --------------- |
| 1.0.0   | initial version |