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Groovy example source code file (matrix.java)

This example Groovy source code file (matrix.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

io, size, size, util

The Groovy matrix.java source code

// $Id: matrix.java,v 1.1 2004-05-23 07:14:27 bfulgham Exp $
// http://www.bagley.org/~doug/shootout/
// modified to use a little less memory by Thomas Holenstein

import java.io.*;
import java.util.*;

public class matrix {
    static int SIZE = 30;

    public static void main(String args[]) {
	int n = Integer.parseInt(args[0]);
	int m1[][] = mkmatrix(SIZE, SIZE);
	int m2[][] = mkmatrix(SIZE, SIZE);
	int mm[][] = new int[SIZE][SIZE];
	for (int i=0; i<n; i++) {
	    mmult(SIZE, SIZE, m1, m2, mm);
	}
	System.out.print(mm[0][0]);
	System.out.print(" ");
	System.out.print(mm[2][3]);
	System.out.print(" ");
	System.out.print(mm[3][2]);
	System.out.print(" ");
	System.out.println(mm[4][4]);
    }

    public static int[][] mkmatrix (int rows, int cols) {
	int count = 1;
	int m[][] = new int[rows][cols];
	for (int i=0; i<rows; i++) {
	    for (int j=0; j<cols; j++) {
		m[i][j] = count++;
	    }
	}
	return(m);
    }

    public static void mmult (int rows, int cols, 
	                      int[][] m1, int[][] m2, int[][] m3) {
	for (int i=0; i<rows; i++) {
	    for (int j=0; j<cols; j++) {
		int val = 0;
		for (int k=0; k<cols; k++) {
		    val += m1[i][k] * m2[k][j];
		}
		m3[i][j] = val;
	    }
	}
    }
}

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