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:Main.java

public static int getMapSize(double zoomLevel, int tileSize) {
    return (int) Math.pow(2d, getZoomLevelAsInt(zoomLevel)) * getTileSize(zoomLevel, tileSize);
}

From source file:Util.java

/**
 * Extracts a decimal digit from a number
 * //  w  ww.  j  a  v a  2  s  .  c o  m
 * @param value
 *           The number to extract from
 * @param place
 *           The index of the digit to extract: 0 for units, 1 for
 *           tens, 2 for hundreds, -1 for tenths, and so on
 * @return The designated digit
 */
public static int extractDigit(float value, int place) {
    float pow = (float) Math.pow(10, place);
    float powp = pow * (place < 0 ? -10 : 10);

    value %= powp;

    return (int) (value / pow);
}

From source file:Main.java

public static double[] magnititute(double accx[], double accy[], double accz[]) {
    if (!((accx.length == accy.length) && (accy.length == accz.length))) {
        return null;
    }/* w w  w. j  a va2s  . c o m*/
    double result[] = new double[accx.length];
    for (int i = 0; i < accx.length; i++) {
        result[i] = 0.0;
        double grav = SensorManager.GRAVITY_EARTH;
        result[i] += Math.pow(accx[i] / grav, 2.0);
        result[i] += Math.pow(accy[i] / grav, 2.0);
        result[i] += Math.pow(accz[i] / grav, 2.0);
        result[i] = Math.sqrt(result[i]);
        result[i] *= 310;
    }

    return result;
}

From source file:Main.java

/**
 * Gets a float array of two lengths representing a rectangles width and height
 * The order of the corners in the input float array is:
 * 0------->1//from  w  ww . j  av a2 s .com
 * ^        |
 * |        |
 * |        v
 * 3<-------2
 *
 * @param corners the float array of corners (8 floats)
 * @return the float array of width and height (2 floats)
 */
public static float[] getRectSidesFromCorners(float[] corners) {
    return new float[] {
            (float) Math.sqrt(Math.pow(corners[0] - corners[2], 2) + Math.pow(corners[1] - corners[3], 2)),
            (float) Math.sqrt(Math.pow(corners[2] - corners[4], 2) + Math.pow(corners[3] - corners[5], 2)) };
}

From source file:Main.java

public static double calculateCosineSimilarity(List<Double> list1, List<Double> list2) {
    if (list1.size() != list2.size()) {
        System.err.println("Two lists must have the same dimensionality.");
        return 0;
    }/*from  w  w w  .  j av a2 s .c  om*/
    double dividend = 0, divisor1 = 0, divisor2 = 0;

    for (int i = 0; i < list1.size(); i++) {
        dividend += list1.get(i) * list2.get(i);
        divisor1 += Math.pow(list1.get(i), 2);
        divisor2 += Math.pow(list2.get(i), 2);
    }
    return dividend / (Math.sqrt(divisor1) * Math.sqrt(divisor2));
}

From source file:Main.java

public static int XYZtoRGB(float x, float y, float z) {
    x /= 100f;/*from   w ww.  j a v  a 2  s  . c o m*/
    y /= 100f;
    z /= 100f;

    float r = x * 3.2406f + y * -1.5372f + z * -0.4986f;
    float g = x * -0.9689f + y * 1.8758f + z * 0.0415f;
    float b = x * 0.0557f + y * -0.2040f + z * 1.0570f;

    if (r > 0.0031308) {
        r = 1.055f * (float) Math.pow(r, 1 / 2.4f) - 0.055f;
    } else {
        r = 12.92f * r;
    }

    if (g > 0.0031308) {
        g = 1.055f * (float) Math.pow(g, 1 / 2.4f) - 0.055f;
    } else {
        g = 12.92f * g;
    }

    if (b > 0.0031308) {
        b = 1.055f * (float) Math.pow(b, 1 / 2.4f) - 0.055f;
    } else {
        b = 12.92f * b;
    }

    return 0xFF000000 | (((int) (r * 255.0f)) << 16) | (((int) (g * 255.0f)) << 8) | ((int) (b * 255.0f));
}

From source file:Main.java

public static double gps2km(final double lat_a, final double lng_a, final double lat_b, final double lng_b) {
    if (!isGpsValid(lng_a, lat_a) || !isGpsValid(lng_b, lat_b)) {
        return -1;
    }/*from  www  .j av a2s . c o  m*/
    final double radLat1 = (lat_a * Math.PI / 180.0);
    final double radLat2 = (lat_b * Math.PI / 180.0);
    final double a = radLat1 - radLat2;
    final double b = (lng_a - lng_b) * Math.PI / 180.0;
    final double s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a / 2), 2)
            + Math.cos(radLat1) * Math.cos(radLat2) * Math.pow(Math.sin(b / 2), 2)));
    return s * EARTH_RADIUS;
}

From source file:Main.java

public static boolean withPointRadius(PointF cur, PointF target, float radius) {
    double space_2 = Math.pow(Math.abs(cur.x - target.x), 2) + Math.pow(Math.abs(cur.y - target.y), 2);
    double space = Math.sqrt(space_2);
    if (radius > space) {
        return true;
    }/*from   ww w .j a  v  a  2  s .co m*/
    return false;
}

From source file:Main.java

/**
 * Function to calculate the distance in meters from dbm rssi values.
 * http://rvmiller.com/2013/05/part-1-wifi-based-trilateration-on-android/
 *
 * The function is based on Free Space Path Loss, and may not work with
 * indoor signal propagation.//from  ww w .j  a  va2 s  .c om
 *
 * @param levelInDb RSSI value.
 * @param freqInMHz Frequency of the sending device.
 * @return Distance in meters.
 */
public static double distanceFSPL(double levelInDb, double freqInMHz) {
    double exp = (27.55 - (20 * Math.log10(freqInMHz)) + Math.abs(levelInDb)) / 20.0;
    return Math.pow(10.0, exp);
}

From source file:Main.java

/**
 * Calculates distance using Free-space path loss. Constant -27.55 is used for calculations, where frequency is in MHz and distance in meters.
 * FSPL(dB) = 20 log(d) + 20 log(f) - 27.55; d distance from the transmitter [m], f signal frequency [MHz]
 *
 * @param level measured RSSI [dBm]/*  www.  j  a  v  a2 s .c om*/
 * @param freq  WiFi frequency [MHz]
 * @return distance from AP [m]
 */
public static double calculateDistance(double level, double freq) {
    double exp = (27.55 - (20 * Math.log10(freq)) + Math.abs(level)) / 20.0;
    return Math.pow(10.0, exp);
}