class CompatibilityMatrix {

    int[][] fix() {
        int[][] m = new int[nRows][mCols];
        for (int i = 0; i < nRows; i++)
            System.arraycopy(data, (i * mCols), m[i], 0, mCols);
        return m;
    }

      CompatibilityMatrix(int nRows, int mCols);

}