How to calculate the sum product of two matrices? For example, X and Y are both matrices, how do I get Σ(X-Y)'(X-Y) in R?
Matrix multiplication can be done with %*% operator, i.e. X %*% Y.
%*%
X %*% Y
"Sumproduct" is a term I'm familiar with from Excel, but in that case applies to vectors, not matricies. This can be done in R as sum(x * y)
sum(x * y)
This topic was automatically closed 21 days after the last reply. New replies are no longer allowed. If you have a query related to it or one of the replies, start a new topic and refer back with a link.