public void TestCumProd()
{
Pair col = new Pair("Column1", new Series(new NDArray(10, 20, 30)));
Pair col1 = new Pair("Column2", new Series(new NDArray(40, 50, 60)));
DataFrame df = new DataFrame(col, col1);
DataFrame t = df.CumProd();
Pair col5 = new Pair("Column1", new Series(new NDArray(10, 200, 6000)));
Pair col6 = new Pair("Column2", new Series(new NDArray(40, 2000, 120000)));
DataFrame z = new DataFrame(col5, col6);
Assert.True(t.Equals(z), "Arrays are not equal.");
}