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GLAST/LAT > DAQ and FSW > FSW > Doxygen Index > LCBT / V1-4-2

Constituent: ssrsim     Tag: linux-gcc

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RND.c File Reference

Random Number Distributions, interface. More...

#include "RND.h"
#include <math.h>

Include dependency graph for RND.c:

Functions
unsigned int	RND__lc0_args (unsigned int prv, unsigned int a, unsigned int c)
	Produces a random number in the range 0 - 2**32-1 using a linear congruent method.
void	RND_lc0_init (RND_lc0 *ctx, unsigned int seed)
	Init.
unsigned int	RND_lc0_gen (RND_lc0 *ctx)
	Produces a random number in the range 0 - 2**32-1 using a linear congruent method.
int	RND_normal_lc0_gen (RND_normal_lc0 *ctx)
	Produces a normal distribution.

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Detailed Description

Random Number Distributions, interface.

Author:

JJRussell - russell@slac.stanford.edu

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Function Documentation

unsigned int RND__lc0_args (  unsigned int  prv, unsigned int  a, unsigned int  c )  [inline, static]

Produces a random number in the range 0 - 2**32-1 using a linear congruent method. Returns: A random number in the range 0 - 2**32 - 1 Parameters: prv  The previous random number a  The multiplier c  The additive factor One should scale this number by a suitable factor to produce the desired distribution. No should not use a modulus function. For example, do not do r = RND__lc0_args (...) % 256; To produce a number from 0 - 255. Rather do r = RND__lco_args (...) >> 24;

unsigned int RND_lc0_gen (  RND_lc0 *  ctx  )

Produces a random number in the range 0 - 2**32-1 using a linear congruent method. Returns: A random number in the range 0 - 2**32 - 1 Parameters: ctx  Context parameter One should scale this number by a suitable factor to produce the desired distribution. No should not use a modulus function. For example, do not do r = RND__lc0_args (...) % 256; To produce a number from 0 - 255. Rather do r = RND__lco_args (...) >> 24;

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void RND_lc0_init (  RND_lc0 *  ctx, unsigned int  seed )

Init. Returns: Init random number struct to suggested values Parameters: ctx  Context parameter seed  random number seed

int RND_normal_lc0_gen (  RND_normal_lc0 *  ctx  )

Produces a normal distribution. Returns: A random number drawn from a normal distribution Parameters: ctx  Context parameter

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