# echo

Controls the echoing during their execution.

## Syntax

* state = echo()
* echo()
* echo('on')
* echo('off')

## Input argument

* 'on' - enable echo mode (default)
* 'off' - disable echo mode

## Output argument

* state - a string: 'on' or 'off'

## Description

**echo('off')** disable echo mode.

Without input and output arguments, **echo** toggles the current echo state.

## Example

an example

```matlab
R = echo
echo('on')
A = 1+1
echo('off')
A = A+1
echo(R)
A
```

## See also

[disp](disp).

## History

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

## Author

Allan CORNET
