75 lines
2.6 KiB
Java
Executable File
75 lines
2.6 KiB
Java
Executable File
package org.broadinstitute.sting.utils;
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import cern.jet.math.Arithmetic;
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/**
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* MathUtils is a static class (no instantiation allowed!) with some useful math methods.
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*
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* @author Kiran Garimella
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*/
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public class MathUtils {
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/** Private constructor. No instantiating this class! */
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private MathUtils() {}
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/**
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* Compares double values for equality (within 1e-6), or inequality.
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*
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* @param a the first double value
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* @param b the second double value
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* @return -1 if a is greater than b, 0 if a is equal to be within 1e-6, 1 if b is greater than a.
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*/
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public static byte compareDoubles(double a, double b) { return compareDoubles(a, b, 1e-6); }
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/**
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* Compares double values for equality (within epsilon), or inequality.
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*
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* @param a the first double value
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* @param b the second double value
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* @param epsilon the precision within which two double values will be considered equal
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* @return -1 if a is greater than b, 0 if a is equal to be within epsilon, 1 if b is greater than a.
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*/
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public static byte compareDoubles(double a, double b, double epsilon)
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{
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if (Math.abs(a - b) < epsilon) { return 0; }
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if (a > b) { return -1; }
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return 1;
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}
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/**
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* Compares float values for equality (within 1e-6), or inequality.
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*
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* @param a the first float value
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* @param b the second float value
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* @return -1 if a is greater than b, 0 if a is equal to be within 1e-6, 1 if b is greater than a.
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*/
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public static byte compareFloats(float a, float b) { return compareFloats(a, b, 1e-6f); }
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/**
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* Compares float values for equality (within epsilon), or inequality.
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*
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* @param a the first float value
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* @param b the second float value
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* @param epsilon the precision within which two float values will be considered equal
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* @return -1 if a is greater than b, 0 if a is equal to be within epsilon, 1 if b is greater than a.
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*/
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public static byte compareFloats(float a, float b, float epsilon)
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{
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if (Math.abs(a - b) < epsilon) { return 0; }
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if (a > b) { return -1; }
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return 1;
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}
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/**
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* Computes a binomial probability
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*
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* @param k number of successes
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* @param n number of Bernoulli trials
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* @param p probability of success
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*
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* @return the binomial probability of the specified configuration. Computes values down to about 1e-237.
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*/
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public static double binomialProbability(long k, long n, double p) {
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return Arithmetic.binomial(n, k)*Math.pow(p, k)*Math.pow(1.0 - p, n - k);
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}
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}
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