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:org.jstockchart.axis.TimeseriesNumberAxis.java

public List<Tick> refreshTicksHorizontal(Graphics2D g2, Rectangle2D dataArea, RectangleEdge edge) {
    TextAnchor anchor = null;//www . jav  a2  s  . c  om
    TextAnchor rotationAnchor = null;
    double angle = 0.0;
    if (isVerticalTickLabels()) {
        anchor = TextAnchor.CENTER_RIGHT;
        rotationAnchor = TextAnchor.CENTER_RIGHT;
        if (edge == RectangleEdge.TOP) {
            angle = Math.PI / 2.0;
        } else {
            angle = -Math.PI / 2.0;
        }
    } else {
        if (edge == RectangleEdge.TOP) {
            anchor = TextAnchor.BOTTOM_CENTER;
            rotationAnchor = TextAnchor.BOTTOM_CENTER;
        } else {
            anchor = TextAnchor.TOP_CENTER;
            rotationAnchor = TextAnchor.TOP_CENTER;
        }
    }
    return createTicks(logicTicks, anchor, rotationAnchor, angle);
}

---

From source file:SimpleGame.java

/**
 * This builds the view branch of the scene graph.
 * //from   w w  w .jav  a2 s .c  o  m
 * @return BranchGroup with viewing objects attached.
 */
protected BranchGroup buildViewBranch(Canvas3D c) {
    BranchGroup viewBranch = new BranchGroup();
    Transform3D viewXfm = new Transform3D();
    Matrix3d viewTilt = new Matrix3d();
    viewTilt.rotX(Math.PI / -6);
    viewXfm.set(viewTilt, new Vector3d(0.0, 10.0, 10.0), 1.0);
    TransformGroup viewXfmGroup = new TransformGroup(viewXfm);
    ViewPlatform myViewPlatform = new ViewPlatform();
    PhysicalBody myBody = new PhysicalBody();
    PhysicalEnvironment myEnvironment = new PhysicalEnvironment();
    viewXfmGroup.addChild(myViewPlatform);
    viewBranch.addChild(viewXfmGroup);
    View myView = new View();
    myView.addCanvas3D(c);
    myView.attachViewPlatform(myViewPlatform);
    myView.setPhysicalBody(myBody);
    myView.setPhysicalEnvironment(myEnvironment);
    return viewBranch;
}

---

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

public Freqz(double[] b, int n) {
    FastFourierTransformer fft = new FastFourierTransformer(DftNormalization.STANDARD);
    Complex[] hb = fft.transform(Arrays.copyOf(b, 2 * n), TransformType.FORWARD);

    H = Arrays.copyOfRange(hb, 0, n);
    w = new double[n];

    for (int i = 0; i < H.length; i++) {
        w[i] = Math.PI / n * i;
    }//from  w ww.j  a  v a  2  s .  c  om
}

---

From source file:CircleLayoutTest.java

public void layoutContainer(Container parent) {
    Insets insets = parent.getInsets();
    int containerWidth = parent.getSize().width - insets.left - insets.right;
    int containerHeight = parent.getSize().height - insets.top - insets.bottom;
    int xradius = (containerWidth - maxComponentWidth) / 2;
    int yradius = (containerHeight - maxComponentHeight) / 2;

    setSizes(parent);//from  w  w w  .  j  a v a  2s. co m
    int centerX = insets.left + containerWidth / 2;
    int centerY = insets.top + containerHeight / 2;

    int comCount = parent.getComponentCount();
    for (int i = 0; i < comCount; i++) {
        Component c = parent.getComponent(i);
        if (c.isVisible()) {
            Dimension size = c.getPreferredSize();
            double angle = 2 * Math.PI * i / comCount;
            int x = centerX + (int) (Math.cos(angle) * xradius);
            int y = centerY + (int) (Math.sin(angle) * yradius);

            c.setBounds(x - size.width / 2, y - size.height / 2, size.width, size.height);
        }
    }
}

---

From source file:etomica.models.co2.PNCO2GCPM.java

public PNCO2GCPM(ISpace space, int nBody) {
    super(nBody, space);
    pair = new MoleculePair();
    sigmaC = 3.193;//from  w  w w .java 2 s. co  m
    sigmaO = sigmaC * 1.0483; //paper says 3.347;
    coreFac = 0.57 * 0.57;
    epsilonC = Kelvin.UNIT.toSim(71.34);
    epsilonO = Kelvin.UNIT.toSim(67.72);
    tauO = 0.6100;
    tauC = tauO / 1.0483; // paper reports 0.5819, fortran uses this instead
    sqrtCOtau = Math.sqrt(2 * (tauC * tauC + tauO * tauO));
    double[] t = new double[] { tauC, tauO, tauO };
    double[] s = new double[] { sigmaC, sigmaO, sigmaO };
    double[] e = new double[] { epsilonC, epsilonO, epsilonO };
    tauAll = new double[3][3];
    sigmaAll = new double[3][3];
    epsilonAll = new double[3][3];
    for (int i = 0; i < 3; i++) {
        for (int j = 0; j < 3; j++) {
            sigmaAll[i][j] = 0.5 * (s[i] + s[j]);
            epsilonAll[i][j] = 2 * e[i] * e[j] / (e[i] + e[j]);
            tauAll[i][j] = Math.sqrt(2 * (t[i] * t[i] + t[j] * t[j]));
        }
    }
    gamma = 15.5;
    chargeO = Electron.UNIT.toSim(-0.3321);
    chargeC = Electron.UNIT.toSim(+0.6642);
    chargeAll = new double[] { chargeC, chargeO, chargeO };
    sqrtPiCOtau = Math.sqrt(Math.PI * (tauC * tauC + tauO * tauO));
    sqrtPiCCtau = Math.sqrt(Math.PI * (2 * tauC * tauC));
    alphaPar = 4.05;
    alphaPerp = 1.95;

    oldMu = space.makeVector();
    shift = space.makeVector();

    rijVector = space.makeVector();

    work = space.makeVector();

    Tunit = space.makeTensor();
    Tunit.E(new double[][] { { 1, 0, 0 }, { 0, 1, 0 }, { 0, 0, 1 } });
    Tij = space.makeTensor();

    Eq = new IVectorMutable[0];
    Ep = new IVectorMutable[0];
    mu = new IVectorMutable[0];
    component = Component.FULL;
}

---

From source file:com.day.cq.wcm.foundation.TableTest.java

@org.junit.Test
public void testDoubleDataTable() throws IOException {
    Table table = new Table();
    // fill table
    for (int r = 0; r < 25; r++) {
        for (int c = 0; c < 25; c++) {
            double v = Math.sin(r * 2.0 * Math.PI / 25.0) + Math.cos(c * 2.0 * Math.PI / 25.0);
            table.getCell(r, c, true).setText(String.valueOf(v));
        }//  w w w  .ja  va  2  s  . c  o  m
    }
    // check entire table
    double[][] data = table.getDoubleData();
    for (int y = 0; y < data.length; y++) {
        for (int x = 0; x < data[y].length; x++) {
            double d = data[y][x];
            double v = Math.sin(y * 2.0 * Math.PI / 25.0) + Math.cos(x * 2.0 * Math.PI / 25.0);
            assertEquals(d, v, 0.0);
        }
    }
}

---

From source file:com.opengamma.analytics.financial.interestrate.swaption.method.SwaptionPhysicalFixedIborHullWhiteNumericalIntegrationMethod.java

/**
 * Computes the present value of the Physical delivery swaption.
 * @param swaption The swaption./* w  ww .j av  a2  s .c  o  m*/
 * @param hwData The Hull-White parameters and the curves.
 * @return The present value.
 */
public CurrencyAmount presentValue(final SwaptionPhysicalFixedIbor swaption,
        final HullWhiteOneFactorPiecewiseConstantDataBundle hwData) {
    Validate.notNull(swaption);
    Validate.notNull(hwData);
    double expiryTime = swaption.getTimeToExpiry();
    AnnuityPaymentFixed cfe = CFEC.visit(swaption.getUnderlyingSwap(), hwData);
    double[] alpha = new double[cfe.getNumberOfPayments()];
    double[] df = new double[cfe.getNumberOfPayments()];
    double[] discountedCashFlow = new double[cfe.getNumberOfPayments()];
    for (int loopcf = 0; loopcf < cfe.getNumberOfPayments(); loopcf++) {
        alpha[loopcf] = MODEL.alpha(hwData.getHullWhiteParameter(), 0.0, expiryTime, expiryTime,
                cfe.getNthPayment(loopcf).getPaymentTime());
        df[loopcf] = hwData.getCurve(cfe.getDiscountCurve())
                .getDiscountFactor(cfe.getNthPayment(loopcf).getPaymentTime());
        discountedCashFlow[loopcf] = df[loopcf] * cfe.getNthPayment(loopcf).getAmount();
    }
    // Integration
    final SwaptionIntegrant integrant = new SwaptionIntegrant(discountedCashFlow, alpha);
    final double limit = 10.0;
    final double absoluteTolerance = 1.0E-2;
    final double relativeTolerance = 1.0E-6;
    final RungeKuttaIntegrator1D integrator = new RungeKuttaIntegrator1D(absoluteTolerance, relativeTolerance,
            NB_INTEGRATION);
    double pv = 0.0;
    try {
        pv = 1.0 / Math.sqrt(2.0 * Math.PI) * integrator.integrate(integrant, -limit, limit)
                * (swaption.isLong() ? 1.0 : -1.0);
    } catch (final Exception e) {
        throw new RuntimeException(e);
    }
    return CurrencyAmount.of(swaption.getCurrency(), pv);
}

---

From source file:utils.RandomVariable.java

/**
 * Generate a random number from a LogNormal random variable.
 *
 * @param mu mean of the Normal random variable.
 * @param sigma standard deviation of the Normal random variable.
 * @return a double.//from w  w  w  .j  ava  2s  .  co m
 */
public static double logNormal(double mu, double sigma) {
    double x = mu + sigma * Math.cos(2 * Math.PI * rand()) * Math.sqrt(-2 * Math.log(rand()));
    return x;
}

---

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

public double[] getGreeks(final BlackFunctionData data, final EuropeanVanillaOption option,
        final MartingaleCharacteristicExponent ce, final double alpha, final double limitTolerance) {
    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 EuropeanCallFourierTransform psi = new EuropeanCallFourierTransform(ce);
    final double strike = option.getStrike();
    final double t = option.getTimeToExpiry();
    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);

    double kappa = Math.log(strike / forward);
    int n = ce.getCharacteristicExponentAdjoint(MINUS_I, 1.0).length; //TODO have method like getNumberOfparameters 

    Function1D<ComplexNumber, ComplexNumber[]> adjointFuncs = ce.getAdjointFunction(t);
    double[] res = new double[n - 1];

    //TODO This is inefficient as a call to ajointFuncs.evaluate(z), will return several values (the value of the characteristic function and its derivatives), but only one
    // of these values is used by each of the the integraters - a parallel quadrature scheme would be good here 
    for (int i = 0; i < n - 1; i++) {
        final Function1D<Double, Double> func = getIntegrandFunction(adjointFuncs, alpha, kappa, i + 1);
        final double integral = Math.exp(-alpha * Math.log(strike / forward))
                * _integrator.integrate(func, 0.0, xMax) / Math.PI;
        res[i] = discountFactor * forward * integral;
    }//w w  w  .  j a  v a 2s. c  o m
    return res;
}

---

From source file:org.web4thejob.orm.test.AbstractHibernateDependentTest.java

@Before
public void initializeData() {
    if (initialized) {
        return;//from   www  .  j a v a2 s  . com
    }

    Properties datasource = new Properties();
    try {
        datasource.load(new ClassPathResource(DatasourceProperties.PATH).getInputStream());
    } catch (IOException e) {
        e.printStackTrace();
        throw new RuntimeException(e);
    }

    JobletInstaller jobletInstaller;
    jobletInstaller = ContextUtil.getBean(JobletInstaller.class);
    jobletInstaller.setConnectionInfo(datasource);
    List<Exception> errors = jobletInstaller.installAll();
    if (errors.isEmpty()) {
        ContextUtil.addActiveProfile("installed");
        ContextUtil.refresh();
    } else {
        throw new RuntimeException("Test Context initialization failed.");
    }

    initialized = true;
    final DataWriterService dataWriterService = ContextUtil.getDWS();
    for (int i = 1; i <= iterations; i++) {
        Reference2 reference2 = new Reference2(UUID.randomUUID().toString());
        dataWriterService.save(reference2);

        Reference1 reference1 = new Reference1(reference2, UUID.randomUUID().toString());
        dataWriterService.save(reference1);

        final Master1 master1 = new Master1();
        master1.setName(master1.getEntityType().getName());
        master1.setReference1(reference1);
        dataWriterService.save(master1);

        final Master2 master2 = new Master2();
        master2.setKey(UUID.randomUUID().toString());
        master2.setName(master2.getEntityType().getName());
        dataWriterService.save(master2);

        final Detail detail = new Detail();
        detail.setId(new DetailId(master1, master2, UUID.randomUUID().toString(),
                new Random(master1.getId()).nextLong()));
        detail.setFclass(detail.getEntityType());
        detail.setFdate(new Date());
        detail.setFdouble(java.lang.Math.PI);
        detail.setFint(new LocalDate().getMonthOfYear());
        detail.setFstring(new LocalDate().toString());
        detail.setFtimestamp(new Timestamp(System.currentTimeMillis()));
        dataWriterService.save(detail);
    }
}

---

• «
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• 14
• 15
• 16
• 17
• 18
• 19
• 20
• 21
• 22
• 23
• 24
• 25
• 26
• 27
• 28
• 29
• 30
• 31
• 32
• 33
• 34
• 35
• 36
• 37
• 38
• 39
• 40
• 41
• 42
• 43
• 44
• 45
• 46
• 47
• 48
• 49
• 50
• »