[igraph] plot.igraph and x-axis

[Hermann Norpois]

Hello,

I want to have an x-axis with x-values refering to V(g)$x.

How does this work?

I tried

axis (1, at=V(g)$x) without an effect.

dput (axis (1)) has the following output:
c(-1, -0.5, 0, 0.5, 1)

How can I change this? I guess it is more a classical R-question ...

thanks

Hermann