inv
Provides the inverse cumulative distribution function for the distribution This is based on a numerical routine that computes the percentage points for the chi-squared distribution
Return
The inverse cdf evaluated at p
Parameters
p
The probability to be evaluated for the inverse, p must be 0,1 or an IllegalArgumentException is thrown p = 0.0 returns 0.0 p = 1.0 returns Double.POSITIVE_INFINITY