Example usage for java.lang Math PI

Introduction

In this page you can find the example usage for java.lang Math PI.

Prototype

double PI

To view the source code for java.lang Math PI.

Click Source Link

Document

The double value that is closer than any other to pi, the ratio of the circumference of a circle to its diameter.

Usage

From source file:bots.mctsbot.ai.bots.util.Gaussian.java

public final static double smallPhi(double x) {
    return 1.0 / Math.sqrt(2 * Math.PI) * Math.exp(-x * x / 2.0);
}

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From source file:de.termininistic.serein.examples.benchmarks.functions.multimodal.RastriginFunction.java

@Override
public double map(RealVector v) {
    double fx = Double.NaN;
    double[] x = v.toArray();
    int n = x.length;
    fx = 10 * n;/*  w  ww  . j  a va 2  s  .  co  m*/
    for (int i = 0; i < n; i++) {
        fx += x[i] * x[i] - 10 * Math.cos(2 * Math.PI * x[i]);
    }
    return fx;
}

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From source file:edu.ucsf.valelab.saim.calculations.BenchmarkCalculations.java

/**
 * Compares two methods to calculate the Saim function
 * The implementation not using Complex numbers appears to be at least
 * 10 times faster/* www  .j  a  v  a2 s  .c  om*/
 * @throws Exception 
 */
public void test() throws Exception {

    long nrRuns = 100000000;

    double wavelength = 488.0;
    double nSample = 1.36;
    double dOx = 500.0;
    double h = 16.0;

    double angle = Math.toRadians(0.0);
    SaimFunction sf = new SaimFunction(wavelength, dOx, nSample, false);
    Complex rTE = sf.getFresnelTE(0);
    double f = 4.0 * Math.PI * nSample * Math.cos(angle) / wavelength;
    double phaseDiff = f * h;

    // method 1
    long startTime = System.nanoTime();
    double c = rTE.getReal();
    double d = rTE.getImaginary();
    for (int i = 0; i < nrRuns; i++) {
        double val = 1 + 2 * c * Math.cos(phaseDiff) - 2 * d * Math.sin(phaseDiff) + c * c + d * d;
    }
    long endTime = System.nanoTime();
    long took = endTime - startTime;
    System.out.println("First method: " + nrRuns + " runs took: " + took / 1000000 + " milliseconds");

    // method 2
    startTime = System.nanoTime();
    for (int i = 0; i < nrRuns; i++) {
        Complex tmp = new Complex(Math.cos(phaseDiff), Math.sin(phaseDiff));
        Complex fieldStrength = rTE.multiply(tmp);
        fieldStrength = fieldStrength.add(1.0);
        // square of absolute 
        double val = fieldStrength.getReal() * fieldStrength.getReal()
                + fieldStrength.getImaginary() * fieldStrength.getImaginary();
    }
    endTime = System.nanoTime();
    took = endTime - startTime;
    System.out.println("Second method: " + nrRuns + " runs took: " + took / 1000000 + " milliseconds");

}

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From source file:fsm.series.Series_SS.java

@Override
public double getMu_m(int m) {
    return m * Math.PI;
}

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From source file:ch.unil.genescore.vegas.DistributionMethods.java

public static double normalCumulativeProbabilityUpperTailApprox(double q) {

    q = Math.abs(q);/*from  w  w w.  jav  a  2  s .co m*/
    double aa = -(q * q) / 2 - Math.log(q) - 0.5 * Math.log(2 * Math.PI);
    return (Math.exp(aa));
}

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From source file:dnimp.Statistics.java

private double studT(double t, int n) {
    t = Math.abs(t);//from  ww  w.ja  v a 2 s.  c  o  m
    double th = Math.atan(t / Math.sqrt(n));
    double sth = Math.sin(th);
    double cth = Math.cos(th);

    if (n == 1)
        return 1 - th / (Math.PI / 2.0);

    if (n % 2 == 1) {
        return 1 - (th + sth * cth * statCom(cth * cth, 2, n - 3, -1)) / (Math.PI / 2.0);
    } else {
        return 1 - sth * statCom(cth * cth, 1, n - 3, -1);
    }
}

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From source file:Main.java

public static void cosineSimilarityCW() {
    Iterator<Integer> ids = CommentWordCount.keySet().iterator();
    while (ids.hasNext()) {
        int com_id = ids.next();
        Set<String> words1;
        words1 = CommentWordCount.get(com_id).keySet();
        Iterator<Integer> com_iter = CommentWordCount.keySet().iterator();
        while (com_iter.hasNext()) {
            int id = com_iter.next();
            if (com_id < id) {
                Set<String> words2;
                words2 = CommentWordCount.get(id).keySet();

                Vector<Integer> vecA = new Vector<Integer>();
                Vector<Integer> vecB = new Vector<Integer>();

                Iterator<String> w1 = words1.iterator();
                Iterator<String> w2 = words2.iterator();

                HashSet<String> imp = new HashSet<String>();
                while (w1.hasNext()) {
                    String s = w1.next();
                    imp.add(s);/*from  w  ww . j a va  2  s  .  c o m*/
                }
                while (w2.hasNext()) {
                    String s = w2.next();
                    imp.add(s);
                }
                for (String s : imp) {
                    if (CommentWordCount.get(com_id).containsKey(s)) {
                        vecA.add(CommentWordCount.get(com_id).get(s));
                    } else
                        vecA.add(0);

                    if (CommentWordCount.get(id).containsKey(s)) {
                        vecB.add(CommentWordCount.get(id).get(s));
                    } else
                        vecB.add(0);
                }

                //System.out.println("Size : A"+vecA.size()+" Size: B"+vecB.size()+"maxLen:"+maxlength);
                double similarity;
                int product = 0;
                double sumA = 0;
                double sumB = 0;
                for (int i = 0; i < vecA.size(); i++) {
                    product += vecA.elementAt(i) * vecB.elementAt(i);
                    sumA += vecA.elementAt(i) * vecA.elementAt(i);
                    sumB += vecB.elementAt(i) * vecB.elementAt(i);
                }
                sumA = Math.sqrt(sumA);
                sumB = Math.sqrt(sumB);
                similarity = product / (sumA * sumB);
                similarity = Math.acos(similarity) * 180 / Math.PI;
                //System.out.println("Result "+com_id+" "+id+" :"+similarity);

                if (similarity < 75) {
                    //System.out.println("Result "+com_id+" "+id);
                    if (Topic.containsKey(com_id)) {
                        int val = Topic.get(com_id);
                        val++;
                        Topic.put(com_id, val);
                    } else
                        Topic.put(com_id, 1);
                    if (Topic.containsKey(id)) {
                        int val = Topic.get(id);
                        val++;
                        Topic.put(id, val);
                    } else
                        Topic.put(id, 1);
                }

            }
        }
    }
}

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From source file:DrawShapes_2008.java

/**
 * Generates a star Shape from the given location, radii, and points
 * parameters. The Shape is created by constructing a GeneralPath
 * that moves between the inner and outer rings.
 *///  w ww. ja v a  2 s  .  c o  m
private static Shape generateStar(double x, double y, double innerRadius, double outerRadius, int pointsCount) {
    GeneralPath path = new GeneralPath();

    double outerAngleIncrement = 2 * Math.PI / pointsCount;

    double outerAngle = 0.0;
    double innerAngle = outerAngleIncrement / 2.0;

    x += outerRadius;
    y += outerRadius;

    float x1 = (float) (Math.cos(outerAngle) * outerRadius + x);
    float y1 = (float) (Math.sin(outerAngle) * outerRadius + y);

    float x2 = (float) (Math.cos(innerAngle) * innerRadius + x);
    float y2 = (float) (Math.sin(innerAngle) * innerRadius + y);

    path.moveTo(x1, y1);
    path.lineTo(x2, y2);

    outerAngle += outerAngleIncrement;
    innerAngle += outerAngleIncrement;

    for (int i = 1; i < pointsCount; i++) {
        x1 = (float) (Math.cos(outerAngle) * outerRadius + x);
        y1 = (float) (Math.sin(outerAngle) * outerRadius + y);

        path.lineTo(x1, y1);

        x2 = (float) (Math.cos(innerAngle) * innerRadius + x);
        y2 = (float) (Math.sin(innerAngle) * innerRadius + y);

        path.lineTo(x2, y2);

        outerAngle += outerAngleIncrement;
        innerAngle += outerAngleIncrement;
    }

    path.closePath();
    return path;
}

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From source file:Phong.java

/**
 * Erstellt den Szenegraphen/*from  www  .  j  a v a  2  s .com*/
 * 
 * @return BranchGroup
 */
public BranchGroup macheSzene() {
    BranchGroup objWurzel = new BranchGroup();
    // Transformation, 2 Rotationen:
    Transform3D drehung = new Transform3D();
    Transform3D drehung2 = new Transform3D();
    drehung.rotX(Math.PI / 4.0d);
    drehung2.rotY(Math.PI / 5.0d);
    drehung.mul(drehung2);
    TransformGroup objDreh = new TransformGroup(drehung);
    //Loader
    ObjectFile file = new ObjectFile(ObjectFile.RESIZE);
    Scene scene = null;
    try {
        scene = file.load(ClassLoader.getSystemResource("teapot.obj"));

    } catch (Exception e) {
        System.err.println(e);
        System.exit(1);
    }
    objDreh.addChild(scene.getSceneGroup());

    DirectionalLight d_Licht = new DirectionalLight(new Color3f(1.0f, 1.0f, 1.0f),
            new Vector3f(-1.0f, -1.0f, -1.0f));
    d_Licht.setInfluencingBounds(new BoundingSphere(new Point3d(0.0d, 0.0d, 0.0d), 100.0d));
    objDreh.addChild(d_Licht);
    objWurzel.addChild(objDreh);
    return objWurzel;
}

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From source file:ObjectLoader.java

/**
 * Erstellt den Szenegraphen// w w w .ja v a 2  s.  c  om
 * 
 * @return BranchGroup
 */
public BranchGroup macheSzene() {
    BranchGroup objWurzel = new BranchGroup();
    // Transformation, 2 Rotationen:
    Transform3D drehung = new Transform3D();
    Transform3D drehung2 = new Transform3D();
    drehung.rotX(Math.PI / 4.0d);
    drehung2.rotY(Math.PI / 5.0d);
    drehung.mul(drehung2);
    TransformGroup objDreh = new TransformGroup(drehung);
    //Loader
    ObjectFile file = new ObjectFile(ObjectFile.RESIZE);
    Scene scene = null;
    try {
        scene = file.load(ClassLoader.getSystemResource("teapot.obj"));

    } catch (Exception e) {
    }
    objDreh.addChild(scene.getSceneGroup());

    DirectionalLight d_Licht = new DirectionalLight(new Color3f(1.0f, 0.5f, 0.3f),
            new Vector3f(-1.0f, -1.0f, -1.0f));
    d_Licht.setInfluencingBounds(new BoundingSphere(new Point3d(0.0d, 0.0d, 0.0d), 100.0d));
    //      d_Licht.setColor(new Color3f(1.0f,0.5f,0.3f));
    objDreh.addChild(d_Licht);

    objWurzel.addChild(objDreh);
    return objWurzel;
}

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