public static ComplexMatrix zeroMatrix(int rowSize, int colSize) {
        // A row size is number of columns
        // A column size is number of rows
        ComplexMatrix mx = emptyMatrix(rowSize, colSize);

        for (int colIndex = 0; colIndex < rowSize; colIndex++) {
            for (int rowIndex = 0; rowIndex < colSize; rowIndex++) {
                try {
                    mx.setElem(rowIndex, colIndex, new Complex(0, 0));
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
        return mx;
    }