Java sqr sqrt(double value)

Description

Fast sqrt method.

License

Apache License

Parameter

Parameter	Description
value	a parameter

Declaration

static public double sqrt(double value) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright 2011 See AUTHORS file./* w ww  . j a va2s.c o  m*/
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/

public class Main {
    /** Fast sqrt method. Default passes it through one round of Newton's method.
     * 
     * @param value
     * @return
     */
    static public double sqrt(double value) {
        double sqrt = Double.longBitsToDouble(((Double.doubleToLongBits(value) - (1l << 52)) >> 1) + (1l << 61));
        return (sqrt + value / sqrt) / 2.0;
    }
}

Related

1. sqRightFunction(int databaseType, String expr, int length)
2. sqrt(double a)
3. sqrt(double d)
4. sqrt(double n)
5. sqrt(double value)
6. sqrt(double x, int precision)
7. sqrt(final double i)
8. sqrt(final double x)
9. sqrt(float a)