How to turn a hclust-object into JSON for D3?

Question

I'm attempting to visualize a cluster tree using this awesome D3 layout! However, it needs data in JSON format - how do I go from a hclust-object in R to a hierarchical JSON structure?

set.seed(123)
m <- matrix(runif(100), nrow=10)
cl <- hclust(dist(m))
plot(cl)

My googling turned up this hclustToTree function which returns a list that looks promising - but I don't really know where to go from there. Any advice would be much appreciated.

halfway <- hclustToTree(cl)

Answer 1

You're almost there:

jsonTree <- toJSON(halfway)  # part of the RJSONIO library