Example usage for java.lang StrictMath expm1

Introduction

In this page you can find the example usage for java.lang StrictMath expm1.

Prototype

public static native double expm1(double x);

Source Link

Document

Returns e^x -1.

Usage

From source file:Main.java

public static void main(String[] args) {

    double d1 = 0.0, d2 = -(1.0 / 0.0), d3 = (1.0 / 0.0);

    System.out.println(StrictMath.expm1(d1));

    System.out.println(StrictMath.expm1(d2));

    System.out.println(StrictMath.expm1(d3));
}

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From source file:org.esa.beam.util.math.FastMathPerformance.java

public void testExpm1() {
    System.gc();/*from w w w  .  j a  v  a2 s.  c o m*/
    double x = 0;
    long time = System.nanoTime();
    for (int i = 0; i < RUNS; i++)
        x += StrictMath.expm1(-i * F1);
    long strictTime = System.nanoTime() - time;

    System.gc();
    double y = 0;
    time = System.nanoTime();
    for (int i = 0; i < RUNS; i++)
        y += FastMath.expm1(-i * F1);
    long fastTime = System.nanoTime() - time;

    System.gc();
    double z = 0;
    time = System.nanoTime();
    for (int i = 0; i < RUNS; i++)
        z += Math.expm1(-i * F1);
    long mathTime = System.nanoTime() - time;
    report("expm1", x + y + z, strictTime, fastTime, mathTime);
}

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