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Hi listers, I am having some trouble in a matrix multiplication... I have already checked some posts, but I didn't find my problem... I have the following code... But I am not getting the right multiplication... I checked the dimension and they are fine... id_y <- array(1:10,dim=c(2,1,5)) id_yt<-aperm(id_y,c(2,1,3)) m_id<-array(dim=c(dim(id_y)[1],dim(id_y)[1],dim(id_y)[3])) for (i in 1:dim(id_y)[3]){ m_id[,,i]<-id_y[,,i]%*%id_yt[,,i] } m_id -- View this message in context: http://www.nabble.com/Matrix-multiplication---code-problem-tp22835003p22835003.html Sent from the R help...