# invBeta {#invbeta}

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

## Syntax {#syntax}

`invBeta(alpha, beta, X)`

## Arguments {#arguments}

The shape parameters **alpha** and **beta** are positive floating numbers.

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

## Details {#details}

Return the value of a beta inverse cumulative distribution function.

## Examples {#examples}

```
invBeta(2.31, 0.627, [0.001, 0.5, 0.999]);
// output: [0.068102, 0.852866, 0.999994]

invBeta(2.31, 0.627, [0.1, 0.3, 0.5, 0.7, 0.9]);
// output: [0.471316, 0.717156, 0.852866, 0.939378, 0.989912]]
```

