# std

Compute standard deviations.

## Syntax

s = std(x)

s = std(x,scale)

s = std(x,scale,dim)

## Inputs

`x`- Data sample.
`scale`- Scale option.
`dim`- Dimension on which to perform the calculation.

## Outputs

- s
- Standard deviation.

## Examples

Vector example:

```
x = [9.3, 10.6, 11.9, 13.3, 15.1, 18.2];
s = std(x)
```

`s = 3.2303`

Matrix example:

```
x = [9.3, 4.8; 10.6, 6.6; 11.9, 8.0; 13.3, 9.3; 15.1, 10.6; 18.2, 11.9];
s = std(x)
```

```
s = [Matrix] 1 x 2
3.2303 2.6136
```

## Comments

`std(x) = sqrt(SUM(x(i) - mean(x))^2 / (n-1))`

This is the definition for scale = 0.