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java.lang.Object | +--cern.colt.PersistentObject | +--cern.jet.random.AbstractDistribution
Abstract base class for all random distributions. A subclass of this class need to override method nextDouble() and, in rare cases, also nextInt().
Currently all subclasses use a uniform pseudo-random number generation engine and transform its results to the target distribution. Thus, they expect such a uniform engine upon instance construction.
MersenneTwister
is recommended as uniform pseudo-random number generation engine, since it is very strong and at the same time quick.
makeDefaultGenerator()
will conveniently construct and return such a magic thing.
You can also, for example, use DRand
, a quicker (but much weaker) uniform random number generation engine.
Of course, you can also use other strong uniform random number generation engines.
Paul Houle's RngPack package contains some such beasts;
Ranecu
, Ranecu
and Ranlux
are strong well analyzed research grade uniform pseudo-random number generators with known periods.
More info on RngPack can be found here.
Ressources on the Web:
Other useful ressources:
Benchmark
,
Benchmark
, Serialized FormFields inherited from class cern.colt.PersistentObject |
serialVersionUID |
Method Summary | |
double |
apply(double dummy)
Equivalent to nextDouble(). |
int |
apply(int dummy)
Equivalent to nextInt(). |
Object |
clone()
Returns a deep copy of the receiver; the copy will produce identical sequences. |
static RandomElement |
makeDefaultGenerator()
Constructs and returns a new uniform random number generation engine seeded with the current time. |
abstract double |
nextDouble()
Returns a random number from the distribution. |
int |
nextInt()
Returns a random number from the distribution; returns (int) Math.round(nextDouble()). |
Methods inherited from class java.lang.Object |
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Method Detail |
public double apply(double dummy)
apply
in interface DoubleFunction
cern.colt.function.DoubleFunction
argument
- argument passed to the function.public int apply(int dummy)
apply
in interface IntFunction
cern.colt.function.IntFunction
argument
- argument passed to the function.public Object clone()
clone
in class PersistentObject
public static RandomElement makeDefaultGenerator()
MersenneTwister
.public abstract double nextDouble()
public int nextInt()
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