# Gaminv

Gaminv-func

## Definition:

computes the inverse of Gamma cdf at , with parameters and .

The deviate,, associated with the lower tail probability of the distribution with degrees of freedom is defined as the solution to

.

## Parameters:

- (input, double)
- the probability,, from the required Gamma distribution.
- (input, double)
- the shape parameter of the gamma distribution, must be positive().
- (input, double)
- the scale parameter of the gamma distribution , must be positive().
- (output, double)
- the deviate,