RandomStream Class Reference

#include <RandomStream.h>

List of all members.

Public Member Functions
	RandomStream ()
	Default constructor.
	RandomStream (long)
	Constructor with a seed number.
long	nextLong ()
	Returns a random integer number in the range [1,2^32-2].
double	next ()
	Returns a random floating point number in the range (0,1).
double	next (double)
	Returns a random floating point number in the range [0,max).
double	next (double, double)
	Returns a random floating point number in the range [low,high].
Private Attributes
long	lastZ
	Previous random number.
Static Private Attributes
const long	modulus = 2147483647
	Constant = 2^31-1.

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Constructor & Destructor Documentation

RandomStream::RandomStream (   )

Default constructor. This method uses the current machine time as the seed for the random number stream. Definition at line 24 of file RandomStream.cpp. References lastZ, and modulus.

RandomStream::RandomStream (  long  seed  )

Constructor with a seed number. This method takes in a particular value for the stream's beginning value. Thus you can create the same stream of numbers using a particular seed value. Definition at line 38 of file RandomStream.cpp. References lastZ, and modulus.

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Member Function Documentation

double RandomStream::next (  double  low, double  high )

Returns a random floating point number in the range [low,high]. Notice that this method can return values in the full range of low to high, including the endpoint values. If you attempt to pass in values where low > high, the numbers are automatically swapped to enforce low <= high. Parameters: low  The minimum value of the random number. high  The maximum value of the random number. Returns: A random number in the range [low, high] inclusive. Definition at line 92 of file RandomStream.cpp. References modulus, and nextLong().

double RandomStream::next (  double  max  )

Returns a random floating point number in the range [0,max). Notice that this method can return 0.0 but cannot return any number >= max (assuming that max is a positive value). Parameters: max  The upper limit for the returned random number. Returns: A random number in the range [0,max). Definition at line 78 of file RandomStream.cpp. References modulus, and nextLong().

double RandomStream::next (   )

Returns a random floating point number in the range (0,1). Notice that neither 0.0 nor 1.0 can be returned by this method. Returns: A random number in the range (0,1). Definition at line 66 of file RandomStream.cpp. References modulus, and nextLong(). Referenced by Mover::impdiff(), Mover::solve(), and Box< Float >::subdivide().

long RandomStream::nextLong (   )

Returns a random integer number in the range [1,2^32-2]. Use this method if you want to get a random number as a long integer value. Returns: A random number in the range [1,2^32-2]. Definition at line 52 of file RandomStream.cpp. References lastZ, and modulus. Referenced by next().

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Member Data Documentation

long RandomStream::lastZ [private]

Previous random number. Definition at line 20 of file RandomStream.h. Referenced by nextLong(), and RandomStream().

const long RandomStream::modulus = 2147483647 [static, private]

Constant = 2^31-1. Definition at line 18 of file RandomStream.cpp. Referenced by next(), nextLong(), and RandomStream().

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The documentation for this class was generated from the following files:

• RandomStream.h
• RandomStream.cpp

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