class DenseMatrix implements Serializable {

    public double sum() {
        double s = 0.;
        for (int i = 0; i < this.data.length; i++) {
            s += this.data[i];
        }
        return s;
    }

    public  DenseMatrix();
    public  DenseMatrix(int m, int n);
    public  DenseMatrix(int m, int n, double[] data);
    public  DenseMatrix(int m, int n, double[] data, boolean inRowMajor);
    public  DenseMatrix(double[][] data);

}