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 Bitmap revitionImageSize(String path) throws IOException {
    BufferedInputStream in = new BufferedInputStream(new FileInputStream(new File(path)));
    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;/*from   w w w  .  j a  v  a  2 s.  co m*/
    BitmapFactory.decodeStream(in, null, options);
    in.close();
    int i = 0;
    Bitmap bitmap = null;
    while (true) {
        if ((options.outWidth >> i <= 1000) && (options.outHeight >> i <= 1000)) {
            in = new BufferedInputStream(new FileInputStream(new File(path)));
            options.inSampleSize = (int) Math.pow(2.0D, i);
            options.inJustDecodeBounds = false;
            bitmap = BitmapFactory.decodeStream(in, null, options);
            break;
        }
        i += 1;
    }
    return bitmap;
}

From source file:Main.java

/**
 * <p>//w ww. j  ava2  s.  c  o m
 * Calculates the bucket id the key should be placed in according to the
 * first n bits of the key where n is the power of 2 numBuckets is defined
 * as. F.e if 1024 buckets are defined the first 10 bits of the key will be
 * taken as the index for the actual bucket (2^10 = 1024, 2^9 = 512, ...)
 * </p>
 * 
 * @param key
 *            The 64bit key whose bucket index should be calculated
 * @param numBuckets
 *            The total number of available buckets. This should be a power
 *            of two (e.g. 2, 4, 8, 16, 32, ...)
 * @return The bucket index the key should be in
 */
public static int getBucketForKey(long key, final int numBuckets) {
    // test if numBuckets is a power of 2
    int exponent = Math.getExponent(numBuckets);
    if (numBuckets != Math.pow(2, exponent))
        throw new IllegalArgumentException("Number of buckets does not correspond to a power of 2!");
    return (int) (key >> (64 - exponent)) + numBuckets / 2;
}

From source file:Main.java

private static double xyz_rgb(double r) {
    return Math.round(255 * (r <= 0.00304 ? 12.92 * r : 1.055 * Math.pow(r, 1 / 2.4) - 0.055));
}

From source file:Main.java

/**
 * Returns the interpolated holographic highlight alpha for the effect we want when scrolling
 * pages./*from ww w. j  ava 2  s  .c om*/
 */
public static float highlightAlphaInterpolator(float r) {
    float maxAlpha = 0.6f;
    return (float) Math.pow(maxAlpha * (1.0f - r), 1.5f);
}

From source file:Main.java

public static int getScaledImageSize(int maxZoomLevel, int currZoomLevel, int size) {
    double scale = 1.0 / Math.pow(2, maxZoomLevel - currZoomLevel);

    return (int) Math.ceil(size * scale);
}

From source file:Main.java

/**
 * Returns the interpolated view alpha for the effect we want when scrolling pages.
 *//*from w w  w  .  jav a  2  s  . c  o  m*/
public static float viewAlphaInterpolator(float r) {
    final float pivot = 0.95f;
    if (r < pivot) {
        return (float) Math.pow(r / pivot, 1.5f);
    } else {
        return 1.0f;
    }
}

From source file:Main.java

public static Bitmap revitionImageSize(String path) {
    Bitmap bitmap = null;//from   w ww  .  ja  va  2 s . co m
    try {
        BufferedInputStream in = new BufferedInputStream(new FileInputStream(new File(path)));
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeStream(in, null, options);
        in.close();
        int i = 0;

        while (true) {
            if ((options.outWidth >> i <= 1000) && (options.outHeight >> i <= 1000)) {
                in = new BufferedInputStream(new FileInputStream(new File(path)));
                options.inSampleSize = (int) Math.pow(2.0D, i);
                options.inJustDecodeBounds = false;
                bitmap = BitmapFactory.decodeStream(in, null, options);
                break;
            }
            i += 1;
        }
    } catch (Exception e) {
        e.printStackTrace();
    }

    return bitmap;
}

From source file:Main.java

static public float getStationPressure(float altimHg, float elevMeters) {
    // Station pressure is in inHg
    return (float) (altimHg * Math.pow((288 - 0.0065 * elevMeters) / 288, 5.2561));
}

From source file:Main.java

public static float vectorMagnitudeSquare(float[] vector) {
    float accum = 0;

    for (int i = 0; i < vector.length; i++) {
        accum += Math.pow(vector[i], 2);
    }//  w  ww.  java2  s  .  c om

    return Math.abs(accum);
}

From source file:Main.java

public static Float getFloatValue(byte[] value, int format, int position) {
    if (value == null || (format & 15) + position > value.length) {
        return null;
    }//from  w w w  .j a va 2 s. com
    switch (format) {
    case FORMAT_SFLOAT /*50*/:
        int i = value[position + FIRST_BITMASK];
        return Float.valueOf(
                (float) (((double) signed((value[position] & 255) + (((i & 255) & 15) << FOURTH_BITMASK), 12))
                        * Math.pow(10.0d, (double) signed((i & 255) >> THIRD_BITMASK, THIRD_BITMASK))));
    case FORMAT_FLOAT /*52*/:
        int exponent = value[position + CategoryIDVoicemail];
        int mantissa = value[position + SECOND_BITMASK];
        return Float.valueOf((float) (((double) signed(
                ((value[position] & 255) + ((value[position + FIRST_BITMASK] & 255) << FOURTH_BITMASK))
                        + ((mantissa & 255) << FIFTH_BITMASK),
                24)) * Math.pow(10.0d, (double) exponent)));
    default:
        return null;
    }
}