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 float[] LABtoXYZ(Float L, float a, float b) {
    float y = (L + 16f) / 116f;
    float x = a / 500f + y;
    float z = y - b / 200f;

    if (Math.pow(y, 3f) > 0.008856f) {
        y = (float) Math.pow(y, 3f);
    } else {/*from   w ww .jav a2  s  .c o m*/
        y = (y - 16f / 116f) / 7.787f;
    }

    if (Math.pow(x, 3f) > 0.008856f) {
        x = (float) Math.pow(x, 3f);
    } else {
        x = (x - 16f / 116f) / 7.787f;
    }

    if (Math.pow(z, 3f) > 0.008856f) {
        z = (float) Math.pow(z, 3f);
    } else {
        z = (z - 16f / 116f) / 7.787f;
    }

    x = 95.047f * x;
    y = 100.000f * y;
    z = 108.883f * z;

    return new float[] { x, y, z };
}

From source file:Main.java

public static int binaryToAlgorism(String binary) {
    int max = binary.length();
    int result = 0;
    for (int i = max; i > 0; i--) {
        char c = binary.charAt(i - 1);
        int algorism = c - '0';
        result += Math.pow(2, max - i) * algorism;
    }// w w w  . j  a va2s . co m
    return result;
}

From source file:Main.java

public static double calculateHalfByteBCDFromByteArrayAtBaseTen(byte[] b) {
    int power = 0;
    double result = 0.0;
    for (int i = b.length - 1; i >= 0; i--) {
        byte last = b[i];
        double l = (int) (last & 0x0F) * 0.1 * Math.pow(10, power);
        double l2 = (int) (last & 0xF0) * 0.1 * Math.pow(10, power + 1);
        result += l2 + l;/*  w ww .  j ava2s.c  o  m*/
        power = power + 2;
    }
    return result;
}

From source file:Main.java

static public double calculateAccuracy(int txPower, double rssi) {
    if (rssi == 0) {
        return -1.0; // if we cannot determine accuracy, return -1.
    }// w w  w  . j av a2s  .  c om

    double ratio = rssi * 1.0 / txPower;
    if (ratio < 1.0) {
        return Math.pow(ratio, 10);
    } else {
        double accuracy = (0.89976) * Math.pow(ratio, 7.7095) + 0.111;
        return accuracy;
    }
}

From source file:Main.java

/**************************************
 * Math relevant/*from w  w w. j a  v a 2 s.  c o  m*/
 *************************************/

public static double calculatePDFOfNormalDistribution(double mean, double std, double value) {
    double prob = Math.pow(Math.E, -Math.pow(value - mean, 2) / 2 / Math.pow(std, 2))
            / (Math.sqrt(Math.PI * 2) * std);
    if (prob > 1)
        System.out.println(mean + " " + std + " " + value);
    return prob;
}

From source file:Main.java

public static int scalePow2(int height, int width) {
    int scale = 1;
    int size = Math.max(height, width);
    if (size > IMAGE_MAX_SIZE) {
        scale = (int) Math.pow(2, (int) Math.round(Math.log(IMAGE_MAX_SIZE / (double) size) / Math.log(0.5)));
    }/*from  w ww .  ja va 2  s  .c o m*/
    return scale;
}

From source file:Main.java

public static int calculateAccuracy(int txPower, double rssi) {
    if (rssi == 0) {
        return -100; // if we cannot determine accuracy, return -1.
    }//from w w w .j  av  a2s .c o  m
    double ratio = rssi * 1.0 / txPower;
    if (ratio < 1.0) {
        return (int) (100 * Math.pow(ratio, 10));
    } else {
        double accuracy = (0.89976) * Math.pow(ratio, 7.7095) + 0.111;
        return (int) (100 * accuracy);
    }
}

From source file:Main.java

public static boolean isTablet(Activity activity) {
    DisplayMetrics dm = new DisplayMetrics();
    activity.getWindowManager().getDefaultDisplay().getMetrics(dm);
    double diagonalPixels = Math.sqrt(Math.pow(dm.widthPixels, 2) + Math.pow(dm.heightPixels, 2));
    double physicalSize = diagonalPixels / (160 * dm.density);
    return physicalSize > 7;
}

From source file:Main.java

/**
 * Function that rounds a number to N decimal places
 * /*from   ww  w .  j a  v a2  s  .c  om*/
 * @param d
 *            Double to round
 * @param n
 *            Number of decimal places to round to
 * @return
 */
public static double roundn(double d, int n) {
    d = d * Math.pow(10, n);
    d = Math.round(d);
    d = d / Math.pow(10, n);
    return d;
}

From source file:Main.java

public static String doFormatarTamanho(long bytes) {
    int unit = 1024;
    if (bytes < unit)
        return bytes + " B";
    int exp = (int) (Math.log(bytes) / Math.log(unit));
    char pre = "KMGTPE".charAt(exp - 1);
    return String.format("%.1f %sB", bytes / Math.pow(unit, exp), pre);
}