| 1 | /** |
| 2 | * |
| 3 | */ |
| 4 | package de.uka.ipd.sdq.probfunction.math.apache.impl; |
| 5 | |
| 6 | |
| 7 | import org.apache.commons.math.distribution.BinomialDistributionImpl; |
| 8 | |
| 9 | |
| 10 | import de.uka.ipd.sdq.probfunction.math.IBinomialDistribution; |
| 11 | import de.uka.ipd.sdq.probfunction.math.exception.DomainNotNumbersException; |
| 12 | import de.uka.ipd.sdq.probfunction.math.exception.FunctionNotInTimeDomainException; |
| 13 | |
| 14 | import de.uka.ipd.sdq.probfunction.math.exception.UnorderedDomainException; |
| 15 | |
| 16 | /** |
| 17 | * @author joerg |
| 18 | * |
| 19 | */ |
| 20 | public class BinomialDistribution extends AbstractDiscretePDF implements IBinomialDistribution |
| 21 | { |
| 22 | |
| 23 | public BinomialDistribution(int trials, double p) |
| 24 | { |
| 25 | this.internalFunction = new BinomialDistributionImpl(trials, p); |
| 26 | } |
| 27 | |
| 28 | /* (non-Javadoc) |
| 29 | * @see de.uka.ipd.sdq.probfunction.math.IContinousPDF#getStandardDeviation() |
| 30 | */ |
| 31 | @Override |
| 32 | public double getStandardDeviation() |
| 33 | { |
| 34 | int n = ((BinomialDistributionImpl)internalFunction).getNumberOfTrials(); |
| 35 | double p = ((BinomialDistributionImpl)internalFunction).getProbabilityOfSuccess(); |
| 36 | return Math.sqrt(n*p*(1-p)); |
| 37 | } |
| 38 | |
| 39 | /* (non-Javadoc) |
| 40 | * @see de.uka.ipd.sdq.probfunction.math.IContinousPDF#getXinf() |
| 41 | */ |
| 42 | @Override |
| 43 | public double getXinf() { |
| 44 | return 0; |
| 45 | } |
| 46 | |
| 47 | /* (non-Javadoc) |
| 48 | * @see de.uka.ipd.sdq.probfunction.math.IContinousPDF#getXsup() |
| 49 | */ |
| 50 | @Override |
| 51 | public double getXsup() { |
| 52 | |
| 53 | return ((BinomialDistributionImpl)internalFunction).getNumberOfTrials(); |
| 54 | } |
| 55 | |
| 56 | |
| 57 | /* (non-Javadoc) |
| 58 | * @see de.uka.ipd.sdq.probfunction.math.IProbabilityFunction#getArithmeticMeanValue() |
| 59 | */ |
| 60 | @Override |
| 61 | public double getArithmeticMeanValue() throws DomainNotNumbersException, |
| 62 | FunctionNotInTimeDomainException { |
| 63 | return getMean(); |
| 64 | } |
| 65 | |
| 66 | /* (non-Javadoc) |
| 67 | * @see de.uka.ipd.sdq.probfunction.math.IProbabilityFunction#getMedian() |
| 68 | */ |
| 69 | @Override |
| 70 | public Object getMedian() throws UnorderedDomainException { |
| 71 | throw new UnsupportedOperationException(); |
| 72 | } |
| 73 | |
| 74 | /* (non-Javadoc) |
| 75 | * @see de.uka.ipd.sdq.probfunction.math.IProbabilityFunction#getPercentile(int) |
| 76 | */ |
| 77 | @Override |
| 78 | public Object getPercentile(int p) throws IndexOutOfBoundsException, |
| 79 | UnorderedDomainException { |
| 80 | throw new UnsupportedOperationException(); |
| 81 | } |
| 82 | |
| 83 | /* (non-Javadoc) |
| 84 | * @see de.uka.ipd.sdq.probfunction.math.IProbabilityFunction#hasOrderedDomain() |
| 85 | */ |
| 86 | @Override |
| 87 | public boolean hasOrderedDomain() { |
| 88 | throw new UnsupportedOperationException(); |
| 89 | } |
| 90 | |
| 91 | @Override |
| 92 | public double getLowerDomainBorder() { |
| 93 | throw new UnsupportedOperationException(); |
| 94 | } |
| 95 | |
| 96 | |
| 97 | |
| 98 | @Override |
| 99 | public double getMean() { |
| 100 | int n = ((BinomialDistributionImpl)internalFunction).getNumberOfTrials(); |
| 101 | double p = ((BinomialDistributionImpl)internalFunction).getProbabilityOfSuccess(); |
| 102 | return n*p; |
| 103 | } |
| 104 | |
| 105 | @Override |
| 106 | public double getProbability() { |
| 107 | |
| 108 | return ((BinomialDistributionImpl)internalFunction).getProbabilityOfSuccess(); |
| 109 | } |
| 110 | |
| 111 | @Override |
| 112 | public int getTrials() { |
| 113 | |
| 114 | return ((BinomialDistributionImpl)internalFunction).getNumberOfTrials(); |
| 115 | } |
| 116 | |
| 117 | } |