This post had finally written and posted on this link Example of matrix aggregation in R. But unfortunately I only wrote in Indonesian language. Very sorry for that.
After a long hiatus, here's my new post (in Bahasa Indonesia, next will be translated to English) about matrix aggregation. This article is a collaboration between me and Ali Akbar Hakim (@osairisali) a fellow R user from Faculty of Economic Brawijaya University Indonesia. His major is Economic, and currently finishing his undergrad thesis in Input-Output Economic Analysis. The article is currently under final revision, but the following are a few snapshot of it.