Example usage for org.apache.commons.math3.fraction BigFraction pow

Introduction

In this page you can find the example usage for org.apache.commons.math3.fraction BigFraction pow.

Prototype

public double pow(final double exponent) 

Source Link

Document

Returns a double whose value is (this^exponent), returning the result in reduced form.

Usage

From source file:gedi.util.math.stat.distributions.OccupancyNumberDistribution.java

private static final BigFraction rationalv(int a, int b, int k, int n) {
    BigFraction re = BigFraction.ONE;//  ww w . j a v a  2 s  .c  o m
    for (int i = n; i > n - a * b; i--)
        re = re.multiply(new BigFraction(i, 1));
    BigFraction ba = new BigFraction(1, 1);
    for (int i = 1; i <= b; i++)
        ba = ba.multiply(new BigFraction(i, 1));
    re = re.divide(a == 0 ? BigFraction.ONE : ba.pow(a));

    BigFraction f1 = a * b == 0 ? BigFraction.ONE : new BigFraction(1, k).pow(a * b);
    BigFraction f2 = n - a * b == 0 ? BigFraction.ONE : new BigFraction(k - a, k).pow(n - a * b);

    return re.multiply(f1).multiply(f2);
}

---