Example usage for java.lang Math pow

Introduction

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

Prototype

@HotSpotIntrinsicCandidate
public static double pow(double a, double b) 

Source Link

Document

Returns the value of the first argument raised to the power of the second argument.

Usage

From source file:com.google.location.lbs.gnss.gps.pseudorange.EcefToTopocentricConverter.java

/**
 * Transformation of {@code inputVectorMeters} with origin at {@code originECEFMeters} into
 * topocentric coordinate system. The result is {@code TopocentricAEDValues} containing azimuth
 * from north +ve clockwise, radians; elevation angle, radians; distance, vector length meters
 *
 * <p>Source: http://www.navipedia.net/index.php/Transformations_between_ECEF_and_ENU_coordinates
 * http://kom.aau.dk/~borre/life-l99/topocent.m
 *
 *//*w  w  w .  j a v a  2 s. c o  m*/
public static TopocentricAEDValues convertCartesianToTopocentericRadMeters(final double[] originECEFMeters,
        final double[] inputVectorMeters) {

    GeodeticLlaValues latLngAlt = Ecef2LlaConverter.convertECEFToLLACloseForm(originECEFMeters[0],
            originECEFMeters[1], originECEFMeters[2]);

    RealMatrix rotationMatrix = Ecef2EnuConverter
            .getRotationMatrix(latLngAlt.latitudeRadians, latLngAlt.longitudeRadians).transpose();
    double[] eastNorthUpVectorMeters = GpsMathOperations
            .matrixByColVectMultiplication(rotationMatrix.transpose().getData(), inputVectorMeters);
    double eastMeters = eastNorthUpVectorMeters[EAST_IDX];
    double northMeters = eastNorthUpVectorMeters[NORTH_IDX];
    double upMeters = eastNorthUpVectorMeters[UP_IDX];

    // calculate azimuth, elevation and height from the ENU values
    double horizontalDistanceMeters = Math.hypot(eastMeters, northMeters);
    double azimuthRadians;
    double elevationRadians;

    if (horizontalDistanceMeters < MIN_DISTANCE_MAGNITUDE_METERS) {
        elevationRadians = Math.PI / 2.0;
        azimuthRadians = 0;
    } else {
        elevationRadians = Math.atan2(upMeters, horizontalDistanceMeters);
        azimuthRadians = Math.atan2(eastMeters, northMeters);
    }
    if (azimuthRadians < 0) {
        azimuthRadians += 2 * Math.PI;
    }

    double distanceMeters = Math.sqrt(Math.pow(inputVectorMeters[0], 2) + Math.pow(inputVectorMeters[1], 2)
            + Math.pow(inputVectorMeters[2], 2));
    return new TopocentricAEDValues(elevationRadians, azimuthRadians, distanceMeters);
}

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From source file:edu.uniandes.ecos.ase.calculo.CalculoSimpsonRule.java

@Override
public double coeficienteTres(double dof) {
    double coeficienteTres = 0;
    try {//from  www . j  av  a  2s .c om
        coeficienteTres = (calcularGamma((dof + 1) / 2))
                / (((Math.pow(dof * Math.PI, 0.5))) * calcularGamma(dof / 2));
    } catch (Exception e) {
        System.out.println("Error calculando el coeficiente tres: " + e.getMessage());
    }
    return coeficienteTres;
}

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From source file:electrical_parameters.Admittance.java

public Admittance(RealMatrix Dik, RealMatrix Dik_mirror, double[] hx2,
        ArrayList<elpam_input_conductor> cnd_list, double krok, // m
        int n_zv, // -
        int fv, int gw) {
    this.r_cnd = new double[cnd_list.size()];
    if (cnd_list.get(0).isBundle()) {
        double rho = krok / (2 * Math.sin(Math.PI / n_zv));
        for (int i = 0; i < cnd_list.size(); i++) {
            this.r_cnd[i] = Math.pow(n_zv * (cnd_list.get(i).getD() / 2) * Math.pow(rho, n_zv - 1),
                    (double) 1 / n_zv);
        }//  w w  w .j a va2 s .  co m
    } else {
        for (int i = 0; i < cnd_list.size(); i++) {
            this.r_cnd[i] = cnd_list.get(i).getD() / 2;
        }
    }
    this.fv = fv;
    this.gw = gw;
    this.f = constants.getFrequency();

    this.Dik = Dik;
    this.Dik_mirror = Dik_mirror;
    this.hx2 = hx2;

    this.P = new Array2DRowRealMatrix(fv + gw, fv + gw);
    this.P_red = new Array2DRowRealMatrix(fv, fv);
    this.C = new Array2DRowRealMatrix(fv, fv);
    this.B = new Array2DRowRealMatrix(fv, fv);
    this.Y = new ComplexMatrix(fv, fv);

    this.C_symm = new Array2DRowRealMatrix(fv, fv);
    this.B_symm = new Array2DRowRealMatrix(fv, fv);
    this.Y_symm = new ComplexMatrix(fv, fv);

    this.omega = (double) 2 * Math.PI * this.f;
    this.cnst = (double) 1 / (8.854187e-9 * 1 * 2 * Math.PI);
}

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From source file:com.xy.inc.service.impl.POIServiceImpl.java

@Override
public List<POI> buscarPOISProximos(Integer coordenadaX, Integer coordenadaY, Integer distMax)
        throws ServiceException {
    try {//from   www  . ja v  a  2  s  .c o  m
        List<POI> poiList = new ArrayList<>();
        for (POI poi : poiRepository.findAll()) {
            if (Math.sqrt(Math.pow(coordenadaX - poi.getCoordenadaX(), 2)
                    + Math.pow(coordenadaY - poi.getCoordenadaY(), 2)) <= 10) {
                poiList.add(poi);
            }
        }
        return poiList;
    } catch (Exception e) {
        throw new ServiceException("No foi possivel buscar os POIs proximos");
    }
}

---

From source file:com.itemanalysis.psychometrics.kernel.LocalLinearRegression.java

public double[] evaluate(double[] x, double[] y) throws DimensionMismatchException {
    if (x.length != y.length)
        throw new DimensionMismatchException(x.length, y.length);
    n = x.length;/*from www .j  av  a  2 s.  c  o m*/
    double[] yprime = new double[n];
    double d = 0;
    double kernD = 0;
    double s0 = 0, s1 = 0, s2 = 0;

    for (int j = 0; j < numPoints; j++) {
        for (int i = 0; i < n; i++) {
            d = x[i] - points[j];
            kernD = kernel.value(d / bandwidth);
            s0 += kernD;
            s1 += d * kernD;
            s2 += d * d * kernD;
        }
        s0 /= n;
        s1 /= n;
        s2 /= n;

        for (int i = 0; i < n; i++) {
            yprime[j] += ((s2 - s1 * d) * kernD * y[i]) / (s2 * s0 - Math.pow(s1, 2));
        }
        yprime[j] /= n;
    }
    return yprime;
}

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From source file:beans.NTPClient.java

/**
 * Process <code>TimeInfo</code> object and print its details.
 * //from www  .  j  ava  2 s .c  o m
 * @param info
 *          <code>TimeInfo</code> object.
 */
public static void processResponse(TimeInfo info) {
    NtpV3Packet message = info.getMessage();
    int stratum = message.getStratum();
    String refType;
    if (stratum <= 0) {
        refType = "(Unspecified or Unavailable)";
    } else if (stratum == 1) {
        refType = "(Primary Reference; e.g., GPS)"; // GPS, radio clock, etc.
    } else {
        refType = "(Secondary Reference; e.g. via NTP or SNTP)";
    }
    // stratum should be 0..15...
    System.out.println(" Stratum: " + stratum + " " + refType);
    int version = message.getVersion();
    int li = message.getLeapIndicator();
    System.out.println(" leap=" + li + ", version=" + version + ", precision=" + message.getPrecision());

    System.out.println(" mode: " + message.getModeName() + " (" + message.getMode() + ")");
    int poll = message.getPoll();
    // poll value typically btwn MINPOLL (4) and MAXPOLL (14)
    System.out.println(
            " poll: " + (poll <= 0 ? 1 : (int) Math.pow(2, poll)) + " seconds" + " (2 ** " + poll + ")");
    double disp = message.getRootDispersionInMillisDouble();
    System.out.println(" rootdelay=" + numberFormat.format(message.getRootDelayInMillisDouble())
            + ", rootdispersion(ms): " + numberFormat.format(disp));

    int refId = message.getReferenceId();
    String refAddr = NtpUtils.getHostAddress(refId);
    String refName = null;
    if (refId != 0) {
        if (refAddr.equals("127.127.1.0")) {
            refName = "LOCAL"; // This is the ref address for the Local Clock
        } else if (stratum >= 2) {
            // If reference id has 127.127 prefix then it uses its own reference
            // clock
            // defined in the form 127.127.clock-type.unit-num (e.g. 127.127.8.0
            // mode 5
            // for GENERIC DCF77 AM; see refclock.htm from the NTP software
            // distribution.
            if (!refAddr.startsWith("127.127")) {
                try {
                    InetAddress addr = InetAddress.getByName(refAddr);
                    String name = addr.getHostName();
                    if (name != null && !name.equals(refAddr)) {
                        refName = name;
                    }
                } catch (UnknownHostException e) {
                    // some stratum-2 servers sync to ref clock device but fudge stratum
                    // level higher... (e.g. 2)
                    // ref not valid host maybe it's a reference clock name?
                    // otherwise just show the ref IP address.
                    refName = NtpUtils.getReferenceClock(message);
                }
            }
        } else if (version >= 3 && (stratum == 0 || stratum == 1)) {
            refName = NtpUtils.getReferenceClock(message);
            // refname usually have at least 3 characters (e.g. GPS, WWV, LCL, etc.)
        }
        // otherwise give up on naming the beast...
    }
    if (refName != null && refName.length() > 1) {
        refAddr += " (" + refName + ")";
    }
    System.out.println(" Reference Identifier:\t" + refAddr);

    TimeStamp refNtpTime = message.getReferenceTimeStamp();
    System.out.println(" Reference Timestamp:\t" + refNtpTime + "  " + refNtpTime.toDateString());

    // Originate Time is time request sent by client (t1)
    TimeStamp origNtpTime = message.getOriginateTimeStamp();
    System.out.println(" Originate Timestamp:\t" + origNtpTime + "  " + origNtpTime.toDateString());

    long destTime = info.getReturnTime();
    // Receive Time is time request received by server (t2)
    TimeStamp rcvNtpTime = message.getReceiveTimeStamp();
    System.out.println(" Receive Timestamp:\t" + rcvNtpTime + "  " + rcvNtpTime.toDateString());

    // Transmit time is time reply sent by server (t3)
    TimeStamp xmitNtpTime = message.getTransmitTimeStamp();
    System.out.println(" Transmit Timestamp:\t" + xmitNtpTime + "  " + xmitNtpTime.toDateString());

    // Destination time is time reply received by client (t4)
    TimeStamp destNtpTime = TimeStamp.getNtpTime(destTime);
    System.out.println(" Destination Timestamp:\t" + destNtpTime + "  " + destNtpTime.toDateString());

    info.computeDetails(); // compute offset/delay if not already done
    Long offsetValue = info.getOffset();
    Long delayValue = info.getDelay();
    String delay = (delayValue == null) ? "N/A" : delayValue.toString();
    String offset = (offsetValue == null) ? "N/A" : offsetValue.toString();

    System.out.println(" Roundtrip delay(ms)=" + delay + ", clock offset(ms)=" + offset); // offset
                                                                                          // in
                                                                                          // ms
}

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From source file:jsat.distributions.empirical.MyKernelDensityEstimator.java

public static double BandwithGuassEstimate(Vec X) {
    if (X.length() == 1) {
        return 1;
    } else if (X.standardDeviation() == 0) {
        return 1.06 * Math.pow(X.length(), -1.0 / 5.0);
    }//from ww  w .j  av a2s  .  c om

    return 1.06 * X.standardDeviation() * Math.pow(X.length(), -1.0 / 5.0);
}

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From source file:com.alvermont.terraj.stargen.AccreteUtils.java

/**
 * Get the stellar dust limit for a particular mass
 *
 * @param stellMassRatio The stellar mass ratio
 * @return The dust limit for the specified mass
 *///from  ww w . j a va2s .c  o  m
public static double getStellarDustLimit(double stellMassRatio) {
    return (200.0 * Math.pow(stellMassRatio, (1.0 / 3.0)));
}

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From source file:com.opengamma.analytics.financial.model.option.pricing.analytic.formula.CEVPriceFunction.java

@Override
public Function1D<CEVFunctionData, Double> getPriceFunction(final EuropeanVanillaOption option) {
    final double k = option.getStrike();
    final double t = option.getTimeToExpiry();
    final boolean isCall = option.isCall();
    return new Function1D<CEVFunctionData, Double>() {

        @SuppressWarnings("synthetic-access")
        @Override//  www.  j a v  a2s.  c  o m
        public Double evaluate(final CEVFunctionData data) {
            Validate.notNull(data, "data");
            final double forward = data.getForward();
            final double numeraire = data.getNumeraire();
            final double sigma = data.getVolatility();
            final double beta = data.getBeta();
            if (beta == 1.0) {
                final Function1D<BlackFunctionData, Double> blackFormula = BLACK_PRICE_FUNCTION
                        .getPriceFunction(option);
                return blackFormula.evaluate(new BlackFunctionData(forward, numeraire, sigma));
            }
            if (beta == 0.0) {
                final Function1D<NormalFunctionData, Double> normalFormula = NORMAL_PRICE_FUNCTION
                        .getPriceFunction(option);
                return normalFormula.evaluate(new NormalFunctionData(forward, numeraire, sigma));
            }
            final double b = 1.0 / (1 - beta);
            final double x = b * b / sigma / sigma / t;
            final double a = Math.pow(k, 2 * (1 - beta)) * x;
            final double c = Math.pow(forward, 2 * (1 - beta)) * x;
            if (beta < 1) {
                final NonCentralChiSquaredDistribution chiSq1 = new NonCentralChiSquaredDistribution(b + 2, c);
                final NonCentralChiSquaredDistribution chiSq2 = new NonCentralChiSquaredDistribution(b, a);
                if (isCall) {
                    return numeraire * (forward * (1 - chiSq1.getCDF(a)) - k * chiSq2.getCDF(c));
                }
                return numeraire * (k * (1 - chiSq2.getCDF(c)) - forward * chiSq1.getCDF(a));
            }
            final NonCentralChiSquaredDistribution chiSq1 = new NonCentralChiSquaredDistribution(-b, a);
            final NonCentralChiSquaredDistribution chiSq2 = new NonCentralChiSquaredDistribution(2 - b, c);
            if (isCall) {
                return numeraire * (forward * (1 - chiSq1.getCDF(c)) - k * chiSq2.getCDF(a));
            }
            return numeraire * (k * (1 - chiSq2.getCDF(a)) - forward * chiSq1.getCDF(c));
        }
    };
}

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From source file:com.caseystella.analytics.outlier.batch.rpca.RPCA.java

private void computeRSVD() {
    double mu = X.getColumnDimension() * X.getRowDimension() / (4 * l1norm(X.getData()));
    double objPrev = 0.5 * Math.pow(X.getFrobeniusNorm(), 2);
    double obj = objPrev;
    double tol = 1e-8 * objPrev;
    double diff = 2 * tol;
    int iter = 0;

    while (diff > tol && iter < MAX_ITERS) {
        double nuclearNorm = computeS(mu);
        double l1Norm = computeL(mu);
        double l2Norm = computeE();

        obj = computeObjective(nuclearNorm, l1Norm, l2Norm);
        diff = Math.abs(objPrev - obj);
        objPrev = obj;/* www .j  a  v a 2 s.c o m*/

        mu = computeDynamicMu();

        iter = iter + 1;
    }
}

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