Example usage for java.lang StrictMath acos

Introduction

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

Prototype

public static native double acos(double a);

Source Link

Document

Returns the arc cosine of a value; the returned angle is in the range 0.0 through pi.

Usage

From source file:Main.java

public static void main(String[] args) {

    double d1 = 0.90, d2 = 5.00;

    System.out.println("arc cosine value of " + d1 + " = " + StrictMath.acos(d1));

    // returns NaN if argument is NaN or its absolute value is greater than 1
    System.out.println("arc cosine value of " + d2 + " = " + StrictMath.acos(d2));
}

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From source file:net.nicoulaj.benchmarks.math.DoubleAcos.java

@GenerateMicroBenchmark
public void strictmath(BlackHole hole) {
    for (int i = 0; i < data.length - 1; i++)
        hole.consume(StrictMath.acos(data[i]));
}

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

public void testAcos() {
    System.gc();//w  ww. j a  v a 2  s . co  m
    double x = 0;
    long time = System.nanoTime();
    for (int i = 0; i < RUNS; i++)
        x += StrictMath.acos(i / 10000000.0);
    long strictTime = System.nanoTime() - time;

    System.gc();
    double y = 0;
    time = System.nanoTime();
    for (int i = 0; i < RUNS; i++)
        y += FastMath.acos(i / 10000000.0);
    long fastTime = System.nanoTime() - time;

    System.gc();
    double z = 0;
    time = System.nanoTime();
    for (int i = 0; i < RUNS; i++)
        z += Math.acos(i / 10000000.0);
    long mathTime = System.nanoTime() - time;
    report("acos", x + y + z, strictTime, fastTime, mathTime);
}

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