[igraph] Labelling vertices with name while plotting graph

[sloiseau]

Hi,

Plotting question: while reproducing the small exemple given here:

    http://cneurocvs.rmki.kfki.hu/igraphbook/igraphbook-creating.html

The plotting did not label the vertices with their name, as in the figure
on the page, but with their id. How can I force or control the namming of
the vertices?

Thanks for your help,
Sylvain