Example usage for java.lang Math sqrt

Introduction

In this page you can find the example usage for java.lang Math sqrt.

Prototype

@HotSpotIntrinsicCandidate
public static double sqrt(double a)

Source Link

Document

Returns the correctly rounded positive square root of a double value.

Usage

From source file:Main.java

public static float distance(PointF p1, PointF p2) {
    float x = p1.x - p2.x;
    float y = p1.y - p2.y;
    return (float) Math.sqrt(x * x + y * y);
}

From source file:Main.java

/**
 * Get the brightness of a given color/*from ww  w.  jav  a  2 s. co m*/
 *
 * @param color The color
 * @return The brightness value
 */
public static int getBrightness(int color) {
    int r = Color.red(color);
    int g = Color.green(color);
    int b = Color.blue(color);

    return (int) Math.sqrt(r * r * .241 + g * g * .691 + b * b * .068);
}

From source file:Main.java

/**
 * Determine if the device is a 7 tablet
 * //  ww  w. j  av a  2  s.  co 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;

}

From source file:Main.java

public static double stdarr(int[] a, double avg) // std given the average
{
    double res = 0.0;

    for (int i = 0; i < a.length; i++)
        res += (a[i] - avg) * (a[i] - avg);

    return (Math.sqrt(res / (a.length - 1)));

}

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  .  ja  v  a 2  s  .  co m*/
    }
    return (float) Math.sqrt(sum);
}

From source file:Main.java

public static float distance(float x1, float y1, float x2, float y2) {
    float d1 = x1 - x2;
    float d2 = y1 - y2;
    return (float) Math.sqrt((float) Math.pow(d1, 2) + Math.pow(d2, 2));
}

From source file:Main.java

/**
 * Finds out if a number is a prime number or not.
 * //w w  w. ja va  2s .com
 * @param number
 *            The possible prime number
 * @return If it is a prime number or not
 */
public static boolean isPrime(int number) {

    if (number < 2) {
        return false;
    }

    if (number == 2) {
        return true;
    }

    if (number % 2 == 0) {
        return false;
    }

    int root = (int) Math.sqrt((double) number);

    for (int j = 2; j <= root; j++) {
        if (number % j == 0) {
            return false;
        }
    }
    return true;
}

From source file:com.anhth12.lambda.common.math.VectorMath.java

public static double norm(float[] x) {
    double total = 0.0;
    for (float f : x) {
        double d = (double) f;
        total += d * d;/*from  ww  w .j  a v a2s  .co  m*/
    }
    return Math.sqrt(total);
}

From source file:Main.java

/**
 * Get the distance between two points./*  w w  w  . j  a  va 2  s  .c  o  m*/
 */
public static int getDistance(float x1, float y1, float x2, float y2) {
    return (int) Math.sqrt(Math.pow(x1 - x2, 2) + Math.pow(y1 - y2, 2));
}

From source file:edu.csun.ecs.cs.multitouchj.ui.utility.PointUtility.java

public static float getDistance(Point pointA, Point pointB) {
    return (float) Math
            .sqrt(Math.pow((pointB.getX() - pointA.getX()), 2) + Math.pow((pointB.getY() - pointA.getY()), 2));
}