[BioC] Rgraphviz problem

[mike Ad.]

Dear list,

I am using the Rgraphviz("1.10.0”) to layout a graph. I would like to change 
the positions of some nodes (node center). But it seems the node center is 
not an attribute for the node, and I can not set them in the “nodeAttrs” in 
the "agopen".
The reason to do this is because when I plot the graph, the warning message 
says “zero-length arrow is of indeterminate angle and so skipped”. I checked 
the result graph and found that some nodes are very close and the arrows 
between them were not drawn. So, I would like to change the node positions 
for them and replot the graph.
Could some one help with this?

Thanks,
/Mike

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