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.

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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:eu.amidst.core.exponentialfamily.EF_JointNormalGamma.java

/**
 * {@inheritDoc}/*  w ww  . j av a  2s .  c  o m*/
 */
@Override
public double computeLogBaseMeasure(double val) {
    return -0.5 * Math.log(2 * Math.PI);
}

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From source file:es.udc.gii.common.eaf.benchmark.multiobjective.wfg.Wfg_Objective.java

protected double convex(double[] x, int m, int M) {
    int i;/*from   w  ww  .  j a  v a2 s. c o  m*/
    double result = 1.0;
    for (i = 1; i <= M - m; i++) {
        result *= 1.0 - Math.cos(x[i - 1] * Math.PI / 2.0);
    }

    if (m != 1) {
        result *= 1.0 - Math.sin(x[M - m] * Math.PI / 2.0);
    }

    return correct_to_01(result, EPSILON);
}

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From source file:com.opengamma.analytics.financial.model.option.pricing.fourier.FourierPricer.java

public double price(final BlackFunctionData data, final EuropeanVanillaOption option,
        final MartingaleCharacteristicExponent ce, final double alpha, final double limitTolerance,
        final boolean useVarianceReduction) {
    Validate.notNull(data, "data");
    Validate.notNull(option, "option");
    Validate.notNull(ce, "characteristic exponent");
    Validate.isTrue(limitTolerance > 0, "limit tolerance must be > 0");
    Validate.isTrue(alpha <= ce.getLargestAlpha() && alpha >= ce.getSmallestAlpha(),
            "The value of alpha is not valid for the Characteristic Exponent and will most likely lead to mispricing. Choose a value between "
                    + ce.getSmallestAlpha() + " and " + ce.getLargestAlpha());
    final EuropeanPriceIntegrand integrand = new EuropeanPriceIntegrand(ce, alpha, useVarianceReduction);
    final EuropeanCallFourierTransform psi = new EuropeanCallFourierTransform(ce);
    final double strike = option.getStrike();
    final double t = option.getTimeToExpiry();
    final boolean isCall = option.isCall();
    final double forward = data.getForward();
    final double discountFactor = data.getDiscountFactor();
    final Function1D<ComplexNumber, ComplexNumber> characteristicFunction = psi.getFunction(t);
    final double xMax = LIMIT_CALCULATOR.solve(characteristicFunction, alpha, limitTolerance);
    final Function1D<Double, Double> func = integrand.getFunction(data, option);
    final double integral = Math.exp(-alpha * Math.log(strike / forward))
            * _integrator.integrate(func, 0.0, xMax) / Math.PI;
    if (useVarianceReduction) {
        final double black = BLACK_PRICE_FUNCTION.getPriceFunction(option).evaluate(data);
        final double diff = discountFactor * forward * integral;
        return diff + black;
    }//  w w  w .j a  va  2  s  . c  o m

    if (isCall) {
        if (alpha > 0.0) {
            return discountFactor * forward * integral;
        } else if (alpha < -1.0) {
            return discountFactor * (forward * (1 + integral) - strike);
        } else {
            return discountFactor * forward * (integral + 1);
        }
    }
    if (alpha > 0.0) {
        return discountFactor * (forward * (integral - 1) + strike);
    } else if (alpha < -1.0) {
        return discountFactor * forward * integral;
    }
    return discountFactor * (forward * integral + strike);
}

---

From source file:Math3D.java

/**
 * Converts the Matrix into Euler angles (roll, pitch, yaw )
 *///from   w  ww.j a va2  s .c o  m
public static void toEuler(Matrix3d matrix, Vector3d euler) {
    Vector3d v3d = new Vector3d();

    Vector3d zAxis = new Vector3d(0, 0, -1);
    Vector3d yAxis = new Vector3d(0, 1, 0);
    Vector3d xAxis = new Vector3d(1, 0, 0);

    v3d.set(xAxis);
    matrix.transform(v3d);
    v3d.x = Math.abs(v3d.x);
    v3d.z = 0;
    v3d.normalize();

    euler.x = xAxis.angle(v3d);

    v3d.set(yAxis);
    matrix.transform(v3d);
    v3d.z = Math.abs(v3d.z);
    v3d.x = 0;
    v3d.normalize();

    euler.y = yAxis.angle(v3d);

    v3d.set(zAxis);
    matrix.transform(v3d);
    v3d.y = 0;
    v3d.normalize();

    euler.z = zAxis.angle(v3d);
    if (v3d.x < 0)
        euler.z = 2 * Math.PI - euler.z;
}

---

From source file:net.sf.dsp4j.octave.packages.signal_1_0_11.Freqz.java

public Freqz(double[] b, double[] a, int n) {
    FastFourierTransformer fft = new FastFourierTransformer(DftNormalization.STANDARD);

    Complex[] hb = fft.transform(Arrays.copyOf(b, 2 * n), TransformType.FORWARD);
    Complex[] ha = fft.transform(Arrays.copyOf(a, 2 * n), TransformType.FORWARD);

    H = new Complex[n];
    w = new double[n];

    for (int i = 0; i < H.length; i++) {
        H[i] = hb[i].divide(ha[i]);/*from  www . j  av a 2  s .co  m*/
        w[i] = Math.PI / n * i;
    }

}

---

From source file:edu.stanford.slac.archiverappliance.PB.data.LargePBLineTest.java

@Test
public void testLargeLines() throws Exception {
    // We create vector doubles with a large number of elements; write it out and then test the read.
    String pvName = ConfigServiceForTests.ARCH_UNIT_TEST_PVNAME_PREFIX + "LargeLineTest"
            + largeLineTest.getPartitionGranularity();
    ArchDBRTypes type = ArchDBRTypes.DBR_WAVEFORM_DOUBLE;
    short year = TimeUtils.getCurrentYear();
    for (int i = 1; i < 7200; i++) {
        try (BasicContext context = new BasicContext()) {
            ArrayListEventStream strm = new ArrayListEventStream(1024,
                    new RemotableEventStreamDesc(type, pvName, year));
            DBR_TIME_Double retvd = new DBR_TIME_Double(ArrayUtils
                    .toPrimitive(Collections.nCopies(i, Math.sin(i * Math.PI / 3600)).toArray(new Double[0])));
            retvd.setTimeStamp(new gov.aps.jca.dbr.TimeStamp(TimeUtils.getStartOfCurrentYearInSeconds() + i));
            retvd.setSeverity(1);//w  ww.j a v a  2s .  c om
            retvd.setStatus(0);
            strm.add(new PBVectorDouble(retvd));
            largeLineTest.appendData(context, pvName, strm);
        } catch (Exception ex) {
            logger.error("Exception appending data " + i, ex);
            fail(ex.getMessage());
        }
    }

    Path[] allPaths = PlainPBPathNameUtility.getAllPathsForPV(new ArchPaths(), largeLineTest.getRootFolder(),
            pvName, ".pb", largeLineTest.getPartitionGranularity(), CompressionMode.NONE,
            configService.getPVNameToKeyConverter());
    assertTrue("testLargeLines returns null for getAllFilesForPV for " + pvName, allPaths != null);
    assertTrue("testLargeLines returns empty array for getAllFilesForPV for " + pvName, allPaths.length > 0);

    for (Path destPath : allPaths) {
        try {
            PBFileInfo info = new PBFileInfo(destPath);
            info.getLastEventEpochSeconds();
            assertTrue("File validation failed for " + destPath.toAbsolutePath().toString(),
                    ValidatePBFile.validatePBFile(destPath, false));
        } catch (Exception ex) {
            logger.error("Exception parsing file" + destPath.toAbsolutePath().toString(), ex);
            fail(ex.getMessage());
        }
    }

}

---

From source file:HelloUniverse1.java

public BranchGroup createSceneGraph() {
    // Create the root of the branch graph
    BranchGroup objRoot = new BranchGroup();

    // Create the TransformGroup node and initialize it to the
    // identity. Enable the TRANSFORM_WRITE capability so that
    // our behavior code can modify it at run time. Add it to
    // the root of the subgraph.
    TransformGroup objTrans = new TransformGroup();
    objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
    objRoot.addChild(objTrans);/*from w w  w.  j  a  v a  2s .  co m*/

    // Create a simple Shape3D node; add it to the scene graph.
    objTrans.addChild(new ColorCube(0.4));

    // Create a new Behavior object that will perform the
    // desired operation on the specified transform and add
    // it into the scene graph.
    Transform3D yAxis = new Transform3D();
    Alpha rotationAlpha = new Alpha(-1, 4000);

    RotationInterpolator rotator = new RotationInterpolator(rotationAlpha, objTrans, yAxis, 0.0f,
            (float) Math.PI * 2.0f);
    BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 100.0);
    rotator.setSchedulingBounds(bounds);
    objRoot.addChild(rotator);

    // Have Java 3D perform optimizations on this scene graph.
    objRoot.compile();

    return objRoot;
}

---

From source file:etomica.virial.MCMoveClusterRingRegrowOrientation.java

/**
 * Set PI harmonic spring stiffness for given temperature and atomic mass.
 * Dimer is assumed to be composed of two atoms of the given mass.
 *//*  w w  w .j  a  v  a 2s  . c  om*/
public void setStiffness(double t, double mass) {
    double lambda = Constants.PLANCK_H / (Math.sqrt(2 * Math.PI * mass * t));
    kHarmonic = Math.PI * P / (lambda * lambda);
    //        System.out.println("Stiffness = "+stiffness);
}

---

From source file:PureImmediate.java

public void render() {
    if (gc == null) {
        // Set up Graphics context
        gc = canvas.getGraphicsContext3D();
        gc.setAppearance(new Appearance());

        // Set up geometry
        cube = new ColorCube(0.4).getGeometry();
    }// w  w  w .j  av  a 2s.c  o m

    // Compute angle of rotation based on alpha value
    double angle = rotAlpha.value() * 2.0 * Math.PI;
    cmt.rotY(angle);

    // Render the geometry for this frame
    gc.clear();
    gc.setModelTransform(cmt);
    gc.draw(cube);
    canvas.swap();
}

---

From source file:BackEnd.B_calculation.java

private FazorVektor calc_DB(DPoint Rp, DPoint R0, DPoint deltaL) throws DelaunayError {
    DPoint R_0 = new DPoint(R0.getX(), R0.getY(), R0.getZ());
    R_0.setY(R0.getY() + R0_bundleY); //  bundle korektura pre jeden druhy SMER // treba to priemetovat
    R_0.setZ(R0.getZ() + Math.cos(beta) * R0_bundleZ); // priemety
    R_0.setX(R0.getX() + Math.sin(beta) * R0_bundleZ);

    //  System.out.println( "R_0= " + R_0 );
    //  System.out.println( "Rp= " + Rp );
    ////w  ww. j  a  va2s. c  o m
    // System.out.println( "deltal= " + deltaL );
    double K = (this.mu0 * this.muR) / (4 * Math.PI); // kontanta

    DPoint R = help.substract(Rp, R_0); // rozdiel vektorov
    double menovatel = Math.pow(get_ABS(R), 3);
    FazorVektor deltaB = new FazorVektor(new Complex(0, 0), new Complex(0, 0), new Complex(0, 0));

    DPoint C = vektor_sucin(deltaL, R);

    deltaB.setX_Real(K * ((getI_real() * C.getX()) / menovatel));
    deltaB.setY_Real(K * ((getI_real() * C.getY()) / menovatel));
    deltaB.setZ_Real(K * ((getI_real() * C.getZ()) / menovatel));

    deltaB.setX_Imaginary(K * ((getI_image() * C.getX()) / menovatel));
    deltaB.setY_Imaginary(K * ((getI_image() * C.getY()) / menovatel));
    deltaB.setZ_Imaginary(K * ((getI_image() * C.getZ()) / menovatel));

    return deltaB;
}

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