Browsing Posts in R

For this month’s T-SQL Tuesday, hosted by Sebastian Meine, we are asked to talk about joins. Joins in T-SQL are really easy and efficient compared to most other languages.  My goal here is to take a simple example and show how such a join could be represented in SQL and several other languages to help […]

While attempting to write out an algorithm to find all triangles (a->b->c->a) from an adjacency matrix, I stumbled across functionality in the igraph library for R that makes this process trivial to implement for any pattern. triangles.Rraw downloadlibrary(igraph) #create an arbitrary graph adjacency.graph <-,0.1,directed=TRUE) #create the pattern to match triangle <- graph.ring(3,directed=TRUE) #find all […]