Java BigDecimal Calculate calculateLHS(BigDecimal a, Vector Bj, Vector Bj1)

Description

calculate LHS

License

Open Source License

Declaration

public static BigDecimal calculateLHS(BigDecimal a, Vector Bj, Vector Bj1) 

Method Source Code

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

import java.math.BigDecimal;

import java.util.Vector;

public class Main {
    /***                               ***/
/*  w  ww  .jav a 2 s .c o  m*/
    // LHS for checking reduced basis using vector B1[j], B1[j+1] and a scalar
    public static BigDecimal calculateLHS(BigDecimal a, Vector Bj, Vector Bj1) {
        return dotProduct(add(Bj1, scalarMult(a, Bj)));
    }

    public static BigDecimal dotProduct(Vector a) {
        Vector b = (Vector) a.clone();
        return dotProduct(a, b);

    }

    public static BigDecimal dotProduct(Vector a, Vector b) {
        BigDecimal sum = new BigDecimal("0");
        for (int i = 0; i < a.size(); i++)
            sum = sum.add((((BigDecimal) a.elementAt(i)).multiply((BigDecimal) b.elementAt(i))));

        return sum;
    }

    /***                         ***/

    // 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> scalarMult(BigDecimal scalar, Vector<BigDecimal> a) {
        Vector<BigDecimal> c = (Vector<BigDecimal>) a.clone();
        for (int i = 0; i < a.size(); i++)
            c.set(i, scalar.multiply(((BigDecimal) a.get(i))));

        return c;
    }
}

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