# Problem with the Kronecker product of a big matrix

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## Problem with the Kronecker product of a big matrix

 This post has NOT been accepted by the mailing list yet. Hi guys! I'm a new user of r. I have to calculate the Kronecker product of a matrix 20x20 that are flows of good in the same origins and destinations. Then I have another matrix 3x20 in which there are my 20 destinations/origins linked in 3 variables that are gdp, population and km-highway. I really don't know how to start with the code of Kronecker. I have an example of my teacher but I tried to do it and it didn't work. orig = kronecker(matrix(1, length(unique(determinants[, 2])), 1), as.matrix(determinants[determinants\$Year == i, -c(1:2)]))                 colnames(orig) = sapply(colnames(determinants)[-c(1:2)], newnames_o)                 dest = kronecker(as.matrix(determinants[determinants\$Year == i, -c(1:2)]), matrix(1, length(unique(determinants[, 2])), 1))                 colnames(dest) = sapply(colnames(determinants)[-c(1:2)], newnames_d)                 fulldata = cbind(orig, dest)                 colnames(fulldata) = c(colnames(orig), colnames(dest)) In this code the "determinants and years" are some variables that he created. Can someone help me? :) thank you in advance!