R graph degree.distribution not working

Question

I cannot figure out why degree.distribution is not working for me. I have tried on R i386 3.0.0 and R x64 3.0.0. Here is the simple script to generate a graph and show its distribution:

library(igraph)

testG = graph.empty(n=10, directed=TRUE)
for(row in 1 : 5) {
    src = row
    dest = row + 1
    testG = add.edges(testG, rbind(src, as.numeric(dest)))
    if(row %% 2 == 0) {
        dest = row + 2
        testG = add.edges(testG, rbind(src, as.numeric(dest)))
    }
}
testG

testD = degree.distribution(testG, v=V(testG), cumulative=FALSE)
testD
plot(1 : length(testD), testD, "h", main="Website Graph Degree Distribution", xlab="Degree", ylab="Probability of Degree")
degree(testG)

testG shows: IGRAPH D--- 10 7 -- (makes sense). testD shows: NULL (why?). The plot is with just one value at (1,1). But the graph contains nodes with other degrees, as evidenced by the output of degree(testG), which is [1,3,2,4,2,2,0,0,0,0].

Answer 1

You have to modify the degree.distribution function. Details can be find on following link. Can't replicate result with degree.distribution function of igraph