Example usage for org.apache.commons.math.util FastMath PI

Introduction

In this page you can find the example usage for org.apache.commons.math.util FastMath PI.

Prototype

double PI

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Document

Archimede's constant PI, ratio of circle circumference to diameter.

Usage

From source file:cz.paulrz.montecarlo.random.Sobol.java

@Override
public double nextGaussian() {
    final double random;
    if (Double.isNaN(nextGaussian)) {
        // generate a new pair of gaussian numbers
        final double[] xs = nextPoint();
        final double x = xs[0];
        final double y = xs[1];
        final double alpha = 2 * FastMath.PI * x;
        final double r = FastMath.sqrt(-2 * FastMath.log(y));
        random = r * FastMath.cos(alpha);
        nextGaussian = r * FastMath.sin(alpha);
    } else {/*  ww  w. j  a v a  2  s .  c  om*/
        // use the second element of the pair already generated
        random = nextGaussian;
        nextGaussian = Double.NaN;
    }

    return random;
}

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