# IGamma

From HyPhy Wiki

**IGamma** is a numeric built-in function whose purpose is to compute the Lower Incomplete Beta function of two real valued arguments.

## Contents |

### Syntax

IGamma (a,x);

### Functionality

- If
*a*,*x*are positive real numbers - Number
- then the function computes the incomplete gamma function of the arguments.

### Examples

Argument Type | Input | Result |
---|---|---|

Numeric | IGamma(3,4) |
`0.761897` |

### Notes

Internally this function is implemented as three calls to the Gamma function.