Package org.ojalgo.random
Class Poisson
java.lang.Object
org.ojalgo.random.RandomNumber
org.ojalgo.random.AbstractDiscrete
org.ojalgo.random.Poisson
- All Implemented Interfaces:
Comparable<RandomNumber>
,DoubleSupplier
,Supplier<Double>
,BasicFunction
,NullaryFunction<Double>
,PrimitiveFunction.Nullary
,DiscreteDistribution
,Distribution
,AccessScalar<Double>
,ComparableNumber<RandomNumber>
,NumberDefinition
The Poisson distribution is a discrete probability distribution that expresses the probability of a given
number of events occurring in a fixed interval of time and/or space if these events occur with a known
average rate and independently of the time since the last event. (The Poisson distribution can also be used
for the number of events in other specified intervals such as distance, area or volume.) Distribution of
number of points in random point process under certain simple assumptions. Approximation to the binomial
distribution when aCount is large and aProbability is small. aLambda = aCount * aProbability.
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Nested Class Summary
Nested classes/interfaces inherited from interface org.ojalgo.function.BasicFunction
BasicFunction.Differentiable<N extends Comparable<N>,
F extends BasicFunction>, BasicFunction.Integratable<N extends Comparable<N>, F extends BasicFunction>, BasicFunction.PlainUnary<T, R> -
Field Summary
Fields -
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionprotected double
generate()
double
double
getProbability
(int value) Probability density functiondouble
Subclasses must override either getStandardDeviation() or getVariance()!static Poisson
of
(double lambda) Methods inherited from class org.ojalgo.random.RandomNumber
checkProbabilty, compareTo, doubleValue, floatValue, getStandardDeviation, intValue, invoke, longValue, newSampleSet, random, setRandom, setSeed, toString
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
Methods inherited from interface org.ojalgo.random.Distribution
getStandardDeviation
Methods inherited from interface org.ojalgo.function.NullaryFunction
andThen, get, getAsDouble
Methods inherited from interface org.ojalgo.type.NumberDefinition
booleanValue, byteValue, shortValue
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Field Details
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myLambda
private final double myLambda
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Constructor Details
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Poisson
public Poisson() -
Poisson
public Poisson(double lambda)
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Method Details
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of
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getExpected
public double getExpected() -
getProbability
public double getProbability(int value) Description copied from interface:DiscreteDistribution
Probability density function -
getVariance
public double getVariance()Description copied from class:RandomNumber
Subclasses must override either getStandardDeviation() or getVariance()!- Specified by:
getVariance
in interfaceDistribution
- Overrides:
getVariance
in classRandomNumber
- See Also:
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generate
protected double generate()- Specified by:
generate
in classRandomNumber
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