# invExp {#invexp}

**Parent topic:**[Functions](../../Functions/category.md)

## Syntax {#syntax}

`invExp(mean, X)`

## Arguments {#arguments}

**mean** is the mean of an exponential distribution.

**X** is a floating scalar or vector between 0 and 1.

## Details {#details}

Return the value of an exponential inverse cumulative distribution function.

## Examples {#examples}

```
invExp(1, [0.05 0.15 0.25 0.35]);
// output: [0.051293, 0.162519, 0.287682, 0.430783]

invExp(1, [0.1, 0.3, 0.5, 0.7, 0.9]);
// output: [0.105361, 0.356675, 0.693147, 1.203973, 2.302585]
```

