Reingold-Tilford layout broken in R?

[Gábor Csárdi]

There seems to be a problem with plotting trees in our R-package igraph at
least since version 0.6.5-1.
Actually, the nodes of the tree are *not* plotted hierarchically but they
all are plotted on the same level.

When running the following lines of code with igraph version 0.6.0-3

library("igraph")
g<-graph.tree(20,2)
plot(g,layout=layout.reingold.tilford)
dev.copy2pdf(file="plot_tree_igraph_0.6.0-3.pdf")

I get the plot which is attached and called plot_tree_igraph_0.6.0-3.pdf .

With igraph of the current version 0.6.5-1 and running the same lines of
code, I get the plot called plot_tree_igraph_0.6.5-1.pdf.

My R-version is:
R version 2.15.3 (2013-03-01) -- "Security Blanket"
Copyright (C) 2013 The R Foundation for Statistical Computing
ISBN 3-900051-07-0
Platform: x86_64-pc-linux-gnu (64-bit)

I hope it is only a tiny bug that you can fix easily.
If you need more information, please let me know.

Best wishes,
André Gohr

[Gábor Csárdi (gabor.csardi)]

The development of igraph has moved to github, so please do not comment on this bug here. You are of course welcome to comment on github, here:
https://github.com/igraph/igraph/issues/473