org.jquantlib.math.randomnumbers

Interface RandomNumberGenerator

All Known Implementing Classes:

MersenneTwisterUniformRng

public interface RandomNumberGenerator

Method Summary

Modifier and Type	Method and Description
Sample<java.lang.Double>	next()
long	nextInt32() Once JVM does not support unsigned fixed arithmetic, we use 64bit variables as containers for 32bit values in order to reduce the complexity and performance overhead of certain fixed arithmetic operations.

Method Detail

next

Sample<java.lang.Double> next()

Returns:

another random number

nextInt32

long nextInt32()

Once JVM does not support unsigned fixed arithmetic, we use 64bit variables as containers for 32bit values in order to reduce the complexity and performance overhead of certain fixed arithmetic operations.

From the user's perspective, it's easier to understand that a certain long variable contains values from 0 to 2^32 than understand that a certain int variable contains negative values that should be converted to it's two's complement and extended to a long variable before use.

Returns:

an unsigned 32bit wide number encapsulated in a 64bit container

See Also:

Bug 4504839, Java and Unsigned Types, Two's complement