random_utilities Module Reference

This module contains the subroutine and functions to generate random numbers from different distributions. This file contains part of code from the CosmoMC code with some additions and some modifications. The part coming from the CosmoMC code is copyrighted by its author. More...

Functions/Subroutines
subroutine	initrandom (i, i2)
real(dl) function	random_uniform (a, b)
	This function returns a random number generated from the uniform distribution in [a,b(. To improve performances no check is done in order to ensure that the random number generator is initialised. More...
real(dl) function	gaussian_1 ()
	This function returns a random number generated from the gaussian distribution with mean zero and variance one. It works with the Box-Muller transformation. To improve performances no check is done in order to ensure that the random number generator is initialised.
real(dl) function	random_gaussian (mu, sigma)
	This function returns a random number generated from the gaussian distribution with mean mu and variance sigma. To improve performances no check is done in order to ensure that the random number generator is initialised. More...
subroutine	rmarin (IJ, KL)
double precision function	ranmar ()
	This function returns a random number generated from the uniform distribution in [0,1( This is the random number generator proposed by George Marsaglia in Florida State University Report: FSU-SCRI-87-50 It was slightly modified by F. James to produce an array of pseudorandom numbers.

Variables
integer	rand_inst = 0
integer, parameter	krand = KIND(1.d0)
integer	rand_feedback = 1

Detailed Description

This module contains the subroutine and functions to generate random numbers from different distributions. This file contains part of code from the CosmoMC code with some additions and some modifications. The part coming from the CosmoMC code is copyrighted by its author.

Author

Antony Lewis (CosmoMC part), Marco Raveri

Function/Subroutine Documentation

real(dl) function random_utilities::random_gaussian	(	real(dl), intent(in)	mu,
		real(dl), intent(in)	sigma
	)

This function returns a random number generated from the gaussian distribution with mean mu and variance sigma. To improve performances no check is done in order to ensure that the random number generator is initialised.

Parameters

[in]	mu	the mean of the distribution
[in]	sigma	the variance of the distribution

Definition at line 128 of file 002_Random_utilities.f90.

real(dl) function random_utilities::random_uniform	(	real(dl), intent(in)	a,
		real(dl), intent(in)	b
	)

This function returns a random number generated from the uniform distribution in [a,b(. To improve performances no check is done in order to ensure that the random number generator is initialised.

Parameters

[in]	a	lower bound of the interval
[in]	b	upper bound on the interval

Definition at line 80 of file 002_Random_utilities.f90.