`graphdrawing` - One `phylogenetics` example fails

Question

The following example comes from the PGF documentation (see page 485).
documentclass[12 pt]{article}

usepackage{tikz}
usetikzlibrary{graphs,graphdrawing}
usegdlibrary{phylogenetics}

begin{document}

tikz graph[phylogenetic tree layout,
       upgma,
       distance matrix = {
        0 4 9 9 9 9 9 
        4 0 9 9 9 9 9
        9 9 0 2 7 7 7 
        9 9 2 0 7 7 7 
        9 9 7 7 0 3 5 
        9 9 7 7 3 0 5
        9 9 7 7 5 5 0 }]
{ a, b, c, d, e, f, g };

end{document}

This gives...

Instead of

Is it a bug or is there a missing configuration in my code?

Torbjørn T. · Accepted Answer

No bug, the style of the nodes is determined by the /graph drawing/phylogenetic inner node style. This is by default empty, but in the manual it is defined as described in the section immediately following the example:

Copy the pgfgdset{..} to your preamble to get the same output as in the manual.

Copy the pgfgdset{..} to your preamble to get the same output as in the manual.

`graphdrawing` - One `phylogenetics` example fails

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