[igraph] A problem with exporting to pajek format

[Przemek Grabowicz]

 Dear all,

I am trying to export my network to Pajek format inside of R with 
igraph_nightly_0.6-2288-20110202.

Edges and vertices in my network have attributes. The manual says, that 
the attributes will get printed, however it does not happen to me. Here 
is a code to try:

g=graph.data.frame( 
data.frame(id1=1:9,id2=sample(1:9,9,replace=T),a=1,b=2), 
vertices=data.frame(id=1:9,a=5) )
write.graph(g, file="glpajek.txt", format="pajek" )

And it produces this output in my case:

"glpajek.txt"
*Vertices 9
*Arcs
1 6
2 1
3 9
4 3
5 4
6 2
7 2
8 8
9 4

Is there something what I'm doing wrong? I think it happened to me also 
with a bit older nightly version of igraph: 
igraph_nightly_0.6-1899-20100505.

Best,
Przemek.