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 String humanReadableByteCount(long bytes, boolean si) {
    int unit = si ? 1000 : 1024;
    if (bytes < unit)
        return bytes + " B";
    int exp = (int) (Math.log(bytes) / Math.log(unit));
    String pre = (si ? "kMGTPE" : "KMGTPE").charAt(exp - 1) + (si ? "" : "i");
    return String.format("%.1f %sB", bytes / Math.pow(unit, exp), pre);
}

From source file:Main.java

public static double DistanceOfTwoPoints(double lat1, double lng1, double lat2, double lng2) {
    double radLat1 = rad(lat1);
    double radLat2 = rad(lat2);
    double a = radLat1 - radLat2;
    double b = rad(lng1) - rad(lng2);
    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)));
    s = s * EARTH_RADIUS;/*from w  ww. j  a  va2  s. co  m*/
    s = Math.round(s * 10000) / 10000;
    return s;
}

From source file:Main.java

private static String humanReadableByteCount(long bytes, boolean si) {
    int unit = si ? 1000 : 1024;
    if (bytes < unit)
        return bytes + " B";
    int exp = (int) (Math.log(bytes) / Math.log(unit));
    String pre = (si ? "kMGTPE" : "KMGTPE").charAt(exp - 1) + (si ? "" : "i");
    return String.format("%.1f %sB", bytes / Math.pow(unit, exp), pre);
}

From source file:Main.java

public static double distFrom(double lat1, double lng1, double lat2, double lng2) {
    double earthRadius = 3958.75;
    double dLat = Math.toRadians(lat2 - lat1);
    double dLng = Math.toRadians(lng2 - lng1);
    double sindLat = Math.sin(dLat / 2);
    double sindLng = Math.sin(dLng / 2);
    double a = Math.pow(sindLat, 2)
            + Math.pow(sindLng, 2) * Math.cos(Math.toRadians(lat1)) * Math.cos(Math.toRadians(lat2));
    double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
    double dist = earthRadius * c;

    if (dist >= 1000) {
        int distInInt = (int) dist;
        dist = (int) distInInt;
    } else if (dist >= 100) {
        dist = (((int) (dist * 10)) / 10.0);
    } else {//ww  w .jav  a 2 s . c  o m
        dist = (((int) (dist * 100)) / 100.0);
    }
    return dist;
}

From source file:Main.java

public static Bitmap createPOT(Bitmap bmp) {
    Bitmap potBmp = null;/*from  w  w  w.j a  v a 2 s  . c  o  m*/
    int potWidth = (int) Math.ceil(Math.log(bmp.getWidth()) / Math.log(2));
    int potHeight = (int) Math.ceil(Math.log(bmp.getHeight()) / Math.log(2));
    potHeight = (int) Math.pow(2, potHeight);
    potWidth = (int) Math.pow(2, potWidth);

    if (potWidth == 1) {
        potWidth = 2;
    }
    if (potHeight == 1) {
        potHeight = 2;
    }

    if (potHeight != bmp.getHeight() || potWidth != bmp.getWidth()) {
        int[] colors = new int[potWidth * potHeight];
        int index = 0;

        int offset = potHeight - bmp.getHeight();
        for (int i = 0; i < potHeight; i++) {
            for (int j = 0; j < potWidth; j++) {
                if (i > offset - 1) {
                    if (j < bmp.getWidth() && i < bmp.getHeight()) {
                        colors[index] = bmp.getPixel(j, i);
                    } else {
                        colors[index] = 0;
                    }
                }
                index++;
            }
        }

        potBmp = Bitmap.createBitmap(colors, potWidth, potHeight, bmp.getConfig());
    } else {
        potBmp = bmp;
    }

    System.gc();

    return potBmp;
}

From source file:Main.java

/**
 * Returns a number rounded off to the given number of decimals.
 *
 * @param value    the value to round off.
 * @param decimals the number of decimals.
 * @return a number rounded off to the given number of decimals.
 *//*from   w  w w  .ja  va 2 s . c  om*/
public static double getRounded(double value, int decimals) {
    final double factor = Math.pow(10, decimals);

    return Math.round(value * factor) / factor;
}

From source file:Main.java

/**
 * Get the vectors magnitude.//from  w w w  .j a va2 s  .c  om
 *      v {1, 2, 3}
 *      |v| 3.74...
 *
 * @param v values of vector as arraylist.
 * @return magnitude
 */
public static double magnitudeVector(ArrayList<Double> v) {

    double vectorContent = 0;

    for (Double d : v) {
        vectorContent += Math.pow(d, 2);
    }

    return Math.sqrt(vectorContent);
}

From source file:Main.java

public static String humanReadableCount(long bytes, boolean si) {
    int unit = si ? 1000 : 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("%.2f %s" + (si ? "bps" : "B"), bytes / Math.pow(unit, exp), pre);
}

From source file:Main.java

public static String humanReadableByteCount(long bytes, boolean si) {
    int unit = si ? 1000 : 1024;
    if (bytes < unit) {
        return bytes + " B";
    }//  www.j a  v  a2s  .  co  m
    final int exp = (int) (Math.log(bytes) / Math.log(unit));
    final String pre = (si ? "kMGTPE" : "KMGTPE").charAt(exp - 1) + (si ? "" : "i");
    return String.format("%.1f %sB", bytes / Math.pow(unit, exp), pre);
}

From source file:Main.java

public static double getScreenSize(Activity activity) {
    if (dm == null) {
        dm = new DisplayMetrics();
    }//  www  .  ja  va2 s  . c o  m
    activity.getWindowManager().getDefaultDisplay().getMetrics(dm);
    double x = Math.pow(dm.widthPixels / dm.densityDpi, 2);
    double y = Math.pow(dm.heightPixels / dm.densityDpi, 2);
    return Math.sqrt(x + y);
}