Random number generators

Overview

Between them, Garfield, Heed and Magboltz use the following underlying uniform random number generators:

RNDM: V104, used for non-numeric purposes, considered obsolete
RANMAR: V113, in principle portable with a very small probability of variations in sequence
RANLUX: V115, with default luxury value
RM48: V116, a double precision variation on RANMAR
RANF: G900, considered obsolete, was used by Heed until 15/6/06 on which date it was replaced by RANLUX

Details of calls

Garfield

Type	Garfield function	Underlying Procedure	Usage
Exponential	RNDEXP	RANLUX	rnd_exponential, 1D MC diffusion, 3D MC diffusion, clustering model, avalanche size model, signal checks
Polya	RNDPOL	RNGAMA → (RANLUX, RNORMX → RANLUX)	rnd_polya, avalanche size model
Function	RNDFUN → FUGLUX	RANLUX	rnd_function
Histogram	RNDHIS	RANLUX	rnd_histogram
Uniform	RNDUNI	RANLUX	rnd_uniform, search for function extrema, check for internal points, matrix extrema search
Poisson	-	RNPSSN → (RANLUX, RNORMX → RANLUX)	rnd_poisson
Landau	-	RANLAN → RNDUNI → RANLUX	rnd_landau
3D Gaussian	RNDCOV	RNDNOR → RNORML → RANMAR	3D MC diffusion
Normal	RNDNOR	RNORML → RANMAR	rnd_gauss, rnd_normal, basis of 3D Gaussian random numbers, arrival time distributions, 1D MC diffusion, avalanche timing model, avalanche size model, signal checks, arrival nth electron
Uniform (other versions)	-	RNDM	Cheap scanning of areas
Negative Binomial	RNDNBN (NAG only)	G05EEF, G05EYF	Not used
Uniform (NAG version)	RNDM	G05CAF	Cheap scanning of areas

Heed

Type	Heed function	Underlying Procedure	Usage
Uniform	RANFL	RANLUX	-
Initialisation	RANDSET	RANSET	Not called from Garfield interface (SSEED=0)
Pair of normal	LRANOR	RANFL → RANLUX	-
Poisson	LSPOIS	RANFL → RANLUX, LRANOR → RANFL → RANLUX	-
Histogram	LHISRAN	RANFL → RANLUX	-

Magboltz

Type	Magboltz function	Underlying Procedure	Usage
Uniform	DRAND48	RM48	-

Last updated on 15/6/2006.