Package org.ojalgo.random
Class Poisson
- java.lang.Object
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- org.ojalgo.random.RandomNumber
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- org.ojalgo.random.AbstractDiscrete
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- org.ojalgo.random.Poisson
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- All Implemented Interfaces:
java.lang.Comparable<RandomNumber>
,java.util.function.DoubleSupplier
,java.util.function.Supplier<java.lang.Double>
,BasicFunction
,NullaryFunction<java.lang.Double>
,PrimitiveFunction.Nullary
,DiscreteDistribution
,Distribution
,AccessScalar<java.lang.Double>
,ComparableNumber<RandomNumber>
,NumberDefinition
public class Poisson extends AbstractDiscrete
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
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Nested classes/interfaces inherited from interface org.ojalgo.function.BasicFunction
BasicFunction.Differentiable<N extends java.lang.Comparable<N>,F extends BasicFunction>, BasicFunction.Integratable<N extends java.lang.Comparable<N>,F extends BasicFunction>, BasicFunction.PlainUnary<T,R>
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Field Summary
Fields Modifier and Type Field Description private double
myLambda
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description protected double
generate()
double
getExpected()
double
getProbability(int value)
Probability density functiondouble
getVariance()
Subclasses must override either getStandardDeviation() or getVariance()!static Poisson
of(double lambda)
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Methods inherited from class org.ojalgo.random.RandomNumber
checkProbabilty, compareTo, doubleValue, floatValue, getStandardDeviation, intValue, invoke, longValue, newSampleSet, random, setRandom, setSeed, toString
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Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
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Methods inherited from interface org.ojalgo.random.Distribution
getStandardDeviation
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Methods inherited from interface org.ojalgo.function.NullaryFunction
andThen, get, getAsDouble
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Methods inherited from interface org.ojalgo.type.NumberDefinition
booleanValue, byteValue, shortValue
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Method Detail
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of
public static Poisson of(double lambda)
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getExpected
public double getExpected()
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getProbability
public double getProbability(int value)
Description copied from interface:DiscreteDistribution
Probability density function
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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:
Distribution.getStandardDeviation()
,Distribution.getVariance()
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generate
protected double generate()
- Specified by:
generate
in classRandomNumber
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