# cdfBeta {#cdfbeta}

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

## Syntax {#syntax}

`cdfBeta(alpha, beta, X)`

## Arguments {#arguments}

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

**X** is a numeric scalar or vector.

## Details {#details}

Return the value of the cumulative distribution function of a beta distribution.

## Examples {#examples}

```
cdfBeta(2.31, 0.627, [0.001, 0.5, 0.999]);
// output: [0, 0.116056, 0.976416]

cdfBeta(2.31, 0.627, [0.1, 0.3, 0.5, 0.7, 0.9]);
// output: [0.002451, 0.032995, 0.116056, 0.280532, 0.597694]
```

