# zero

Zeros and gain of SISO dynamic system.

## Syntax

* Z = zero(sys)
* \[Z, gain] = zero(sys)

## Input argument

* sys - a LTI model.

## Output argument

* Z - Zeros of the dynamic system.
* gain - Zero-pole-gain of the dynamic system.

## Description

\[Z, gain] = zero(sys) returns the zero-pole-gain of sys.

## Example

```matlab
sys = tf([4.2,0.25,-0.004],[1,9.6,17]);
[Z, gain] = zero(sys)
```

## See also

[pole](pole).

## History

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

## Author

Allan CORNET
