Thank you Matthias for your answer! I'm still not very clear about this concept of "table". I'll try to explore it further in case I get better understanding. Thank you! ________________________________ From: Matthias Boehm Sent: Saturday, April 22, 2017 12:17:23 AM To: dev@systemml.incubator.apache.org Subject: Re: Table The input vectors to table are interpreted as row indexes and column indexes, respectively. Without weights, we add 1, otherwise the corresponding weight value to the output cells. So in your example you have constant row indexes of 1 but a seq(1,10) for column indexes and hence you get a 1x10 output matrix. Regards, Matthias On 4/21/2017 4:00 AM, arijit chakraborty wrote: > Hi, > > > I was trying to understand what the "table" function does. In the documents, it says: > > > "Returns the contingency table of two vectors A and B. The resulting table F consists of max(A) rows and max(B) columns." > > > Suppose I've 2 matrix A and B of this form: > > > A = matrix(1, 1, 10) > B = matrix(seq(10,1, -1), 10, 1) > > > I should have a matrix of form > > C = matrix(1, 10, 1). > > > But I'm getting > > C = matrix(1, 1, 10). > > > Also, what is the difference between "Group form" and "Scalar form"? > > > Thank you! > > Arijit >