Java BigDecimal Square Root sqrt(BigDecimal value)

Description

sqrt

License

Open Source License

Declaration

public static BigDecimal sqrt(BigDecimal value) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.math.BigDecimal;

import java.util.Vector;

public class Main {
    public static BigDecimal sqrt(BigDecimal value) {

        double val = Math.sqrt(value.doubleValue());

        if (Double.isNaN(val) || Double.isInfinite(val))
            return value;

        BigDecimal x = new BigDecimal(val);
        return x.add(new BigDecimal(value.subtract(x.multiply(x)).doubleValue() / (x.doubleValue() * 2.0)));
    }/*from  w  w w  . ja v a2s . c  o m*/

    /***                         ***/

    // TODO: write vector class that incorporates most vector operations
    public static Vector<BigDecimal> add(Vector<BigDecimal> a, Vector<BigDecimal> b) {
        int m = a.size();
        Vector<BigDecimal> c = new Vector(m);
        for (int i = 0; i < m; i++) {
            BigDecimal value = ((BigDecimal) a.elementAt(i)).add((BigDecimal) b.elementAt(i));
            c.add(value);
        }
        return c;
    }

    public static Vector<BigDecimal> subtract(Vector<BigDecimal> a, Vector<BigDecimal> b) {
        int m = a.size();

        Vector<BigDecimal> c = new Vector(m);

        for (int i = 0; i < m; i++) {
            BigDecimal value = ((BigDecimal) a.elementAt(i)).subtract((BigDecimal) b.elementAt(i));
            c.add(value);
        }
        return c;
    }
}

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