GFS Surface Perturbation Module

Functions/Subroutines
subroutine, public	surface_perturbation::cdfnor (z, cdfz)
	This subrtouine calculates the CDF of the standard normal distribution evaluated at z.
subroutine	surface_perturbation::cdfgam (x, alpha, eps, iflag, cdfx)
subroutine	surface_perturbation::dgamln (x, dgamlnout)
subroutine, public	surface_perturbation::ppfbet (pr, p, q, iflag, x)
	This subroutine computes the beta distribution value that matches the percentile from the random pattern.
subroutine	surface_perturbation::cdfbet (x, p, q, eps, iflag, cdfx)
	This subroutine computes the value of the cumulative beta distribution at a single point x, given the distribution parameters p,q.
subroutine	surface_perturbation::gmln (x, y)
	This subroutine computes the natural logarithm of the gamma distribution. Users can set the absolute accuracy and corresponding xmin.

Detailed Description