Simple Random Matrix that was used at Odessa Hackathon 07/2012, Ukraine

RandomMatrix.java

import java.util.Arrays;
import java.util.Random;

public class RandomMatrix {

    public static void main(String... args) {
        double[][][] matrix = getMatrix(40);
        print(matrix);
    }

    private static void print(double[][][] matrix) {
        System.out.println(Arrays.deepToString(matrix));
    }

    private static double[][][] getMatrix(int height) {
        double[][][] matrix = new double[height][height][height];
        Random random = new Random(System.nanoTime());

        for (int k = 0; k < height; k++) {
            for (int i = 0; i < height; i++) {
                for (int j = 0; j < k; j++) {
                    double value = random.nextDouble();

                    if (k > 0) {
                        if (random.nextBoolean()) {
                            value *= -0.01;
                        }

                        value += matrix[k - 1][i][j];
                    } else {
                        value += random.nextInt(Short.MAX_VALUE);
                    }

                    matrix[k][i][j] = value;
                }
            }
        }

        return matrix;
    }
}