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 norm2(float[] vec) {
    float sum = 0;
    for (float f : vec) {
        sum += Math.pow(f, 2);
    }/*from w w  w.j  av  a  2  s . c  o m*/
    return (float) Math.sqrt(sum);
}

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From source file:Main.java

/** Calculates the contrast between the given color and white, using the algorithm provided by
 * the WCAG v2 in http://www.w3.org/TR/WCAG20/#contrast-ratiodef.
 */// www  .j a  v a  2 s  . c  om
private static float getContrastForColor(int color) {
    float bgR = Color.red(color) / 255f;
    float bgG = Color.green(color) / 255f;
    float bgB = Color.blue(color) / 255f;
    bgR = (bgR < 0.03928f) ? bgR / 12.92f : (float) Math.pow((bgR + 0.055f) / 1.055f, 2.4f);
    bgG = (bgG < 0.03928f) ? bgG / 12.92f : (float) Math.pow((bgG + 0.055f) / 1.055f, 2.4f);
    bgB = (bgB < 0.03928f) ? bgB / 12.92f : (float) Math.pow((bgB + 0.055f) / 1.055f, 2.4f);
    float bgL = 0.2126f * bgR + 0.7152f * bgG + 0.0722f * bgB;
    return Math.abs((1.05f) / (bgL + 0.05f));
}

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From source file:Main.java

/**
 * Returns a List of Lists: all combinations of the elements of the given
 * List./*from  www. jav a  2s  .  co m*/
 *
 * @param maxCombinationSize combinations larger than this value are
 * discarded
 * @param mandatoryItem an item that all returned combinations must contain,
 * or null to leave unspecified
 */
public static List combinations(List original, int maxCombinationSize, Object mandatoryItem) {
    ArrayList combinations = new ArrayList();

    //Combinations are given by the bits of each binary number from 1 to 2^N
    for (int i = 1; i <= ((int) Math.pow(2, original.size()) - 1); i++) {
        ArrayList combination = new ArrayList();
        for (int j = 0; j < original.size(); j++) {
            if ((i & (int) Math.pow(2, j)) > 0) {
                combination.add(original.get(j));
            }
        }
        if (combination.size() > maxCombinationSize) {
            continue;
        }
        if ((mandatoryItem != null) && !combination.contains(mandatoryItem)) {
            continue;
        }
        combinations.add(combination);
    }

    return combinations;
}

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From source file:Main.java

/**
 * Convert XYZ to RGB.//  w  w w. j a  v a2s . co  m
 *
 * Convert equation and source code is from ImageJ's plugin Color Space Converter
 * http://rsbweb.nih.gov/ij/plugins/download/Color_Space_Converter.java
 * 
 * @param X
 * @param Y
 * @param Z
 * @return RGB in int array.
 */
private static int[] XYZtoRGB(double X, double Y, double Z) {
    int[] result = new int[3];

    double x = X / 100.0;
    double y = Y / 100.0;
    double z = Z / 100.0;

    // [r g b] = [X Y Z][Mi]
    double r = (x * Mi[0][0]) + (y * Mi[0][1]) + (z * Mi[0][2]);
    double g = (x * Mi[1][0]) + (y * Mi[1][1]) + (z * Mi[1][2]);
    double b = (x * Mi[2][0]) + (y * Mi[2][1]) + (z * Mi[2][2]);

    // assume sRGB
    if (r > 0.0031308) {
        r = ((1.055 * Math.pow(r, 1.0 / 2.4)) - 0.055);
    } else {
        r = (r * 12.92);
    }

    if (g > 0.0031308) {
        g = ((1.055 * Math.pow(g, 1.0 / 2.4)) - 0.055);
    } else {
        g = (g * 12.92);
    }

    if (b > 0.0031308) {
        b = ((1.055 * Math.pow(b, 1.0 / 2.4)) - 0.055);
    } else {
        b = (b * 12.92);
    }

    r = (r < 0) ? 0 : r;
    g = (g < 0) ? 0 : g;
    b = (b < 0) ? 0 : b;

    // convert 0..1 into 0..255
    result[0] = (int) Math.round(r * 255);
    result[1] = (int) Math.round(g * 255);
    result[2] = (int) Math.round(b * 255);

    return result;
}

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From source file:edu.msu.cme.rdp.graph.sandbox.BloomFilterInterrogator.java

public static void printStats(BloomFilter filter, PrintStream out) {

    long n = filter.getUniqueKmers();
    long m = (long) Math.pow(2, filter.getHashSizeLog2());
    int k = filter.getHashCount();

    //(1-e^(-k*((n+.5)/(m-1))))^k
    double falsePositiveRate = Math.pow((1 - Math.pow(Math.E, -k * ((n + .5) / (m - 1)))), k);

    out.println("Bloom filter created on:       " + filter.getCreatedOn());
    out.println("Serializable id:               " + BloomFilter.serialVersionUID);
    out.println();/*from w  w  w  .j  a  v a2  s .c  o  m*/
    out.println("Bloom filter size log 2:       " + filter.getHashSizeLog2());
    out.println("Bloom filter size (bits) (m):  " + m);
    out.println();
    out.println("Number of bitsets:             " + filter.getNumBitsets());
    out.println("Bitset size (bits):            " + filter.getBitsetSize());
    out.println("Bitset size log2:              " + filter.getBitsetSizeLog2());
    out.println();
    out.println("Number of hashes (k):          " + filter.getHashCount());
    out.println("Hash function name:            " + filter.getHasherClassName());
    out.println();
    out.println("Bitset Mask:                   "
            + StringUtils.leftPad(Long.toBinaryString(filter.getBitsetMask()), 64, '0'));
    out.println("Hash mask:                     "
            + StringUtils.leftPad(Long.toBinaryString(filter.getHashMask()), 64, '0'));
    out.println();
    out.println("Kmer length:                   " + filter.getKmerSize());
    out.println();
    out.println("Total kmers in bloom filter:   " + filter.getTotalKmers());
    out.println("Total strings inserted:        " + filter.getTotalStrings());
    out.println("Total unique kmers:            " + filter.getUniqueKmers());
    out.println("Predicted false positive rate: " + falsePositiveRate);
}

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From source file:Main.java

/**
 * Computes the Euclidean distance between the two colors
 *
 * @param color1 the first color/*  w ww. jav  a  2s .co m*/
 * @param color2 the color to compare with
 * @return the distance between the two colors
 */
private static double getColorDistanceRgb(int color1, int color2) {
    double r, g, b;

    r = Math.pow(Color.red(color2) - Color.red(color1), 2.0);
    g = Math.pow(Color.green(color2) - Color.green(color1), 2.0);
    b = Math.pow(Color.blue(color2) - Color.blue(color1), 2.0);

    return Math.sqrt(b + g + r);
}

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From source file:Main.java

/**
 * Determine if the device is a 7 tablet
 * /*from   www  .j  av  a 2  s  . c  o  m*/
 * @param context
 * @return true if it is >= 6.5 and < 7.6
 */
public static boolean is7InchTablet(Context context) {
    DisplayMetrics metrics = context.getResources().getDisplayMetrics();

    float widthInInches = metrics.widthPixels / metrics.xdpi;
    float heightInInches = metrics.heightPixels / metrics.ydpi;

    double sizeInInches = Math.sqrt(Math.pow(widthInInches, 2) + Math.pow(heightInInches, 2));
    return sizeInInches >= 6.5 && sizeInInches < 7.6;

}

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From source file:Main.java

public static String readableFileSize(long size) {
    if (size <= 0)
        return "0";
    final String[] units = new String[] { "Byte", "KB", "MB", "GB", "TB" };
    int digitGroups = (int) (Math.log10(size) / Math.log10(1024));
    return new DecimalFormat("#,##0.#").format(size / Math.pow(1024, digitGroups)) + " " + units[digitGroups];
}

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From source file:Main.java

public static int generate(byte[] key, long t, int digits) {
    int r = 0;//from   w  w  w.j a v  a  2s  . co  m
    try {
        t /= 30;
        byte[] data = new byte[8];
        long value = t;
        for (int i = 8; i-- > 0; value >>>= 8) {
            data[i] = (byte) value;
        }

        SecretKeySpec signKey = new SecretKeySpec(key, SHA1);
        Mac mac = Mac.getInstance(SHA1);
        mac.init(signKey);
        byte[] hash = mac.doFinal(data);

        int offset = hash[20 - 1] & 0xF;

        long truncatedHash = 0;
        for (int i = 0; i < 4; ++i) {
            truncatedHash <<= 8;
            truncatedHash |= (hash[offset + i] & 0xFF);
        }

        truncatedHash &= 0x7FFFFFFF;
        truncatedHash %= Math.pow(10, digits);

        r = (int) truncatedHash;
    }

    catch (Exception e) {
    }

    return r;
}

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From source file:Main.java

public static double humanSizeToBytes(String value) {
    String scalar;// w  ww. jav  a 2 s.  c  o  m
    int unit = 1024;
    int exp;
    char c;
    double returnValue = 0;

    String[] words = value.split("\\s+");

    //        Log.d("Debug", "words length:" + words.length);

    if (words.length == 2) {

        //            Log.d("Debug", "words[0]:" + words[0]);
        //            Log.d("Debug", "words[1]:" + words[1]);

        try {
            scalar = words[0].replace(",", ".");

            //                Log.d("Debug", "scalar:" + scalar);

            exp = "BKMGTPE".indexOf((words[1]).toCharArray()[0]);

            //                Log.d("Debug", "exp:" + exp);

            returnValue = Double.parseDouble(scalar) * Math.pow(unit, exp);

        } catch (Exception e) {
        }

    }

    return returnValue;
}

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