[BioC] Rgraphviz - neato layout - edge weights have no effect

[Li.Long at isb-sib.ch]

> Dear all,
>
> neato makes layouts according to a physical model in which the length of
> the edges is determined by springs. The weight of the edge is the
> strength of the spring. However, I was not able to find any influence of
> edge weight on the layout. In the
> http://www.graphviz.org/Documentation/neatoguide.pdf the attribute "len"
> is another parameter of the neato layout.
>
> set.seed(31)
> V=letters[1:5]
> g2=randomEGraph(V,0.5)
> plot(g2,"neato",main="All weights 1","All weights are 1.")
>
> # change and edge weight
> edgeData(g2, from = "d", to = "e", attr = "weight") <- 20
> plot(g2,"neato",main="Nothing changed!")
>
> #try out length attribute change
> edgeDataDefaults(g2,"len")=1
> edgeData(g2, from = "d", to = "e", attr = "len") <- 5
> plot(g2,"neato",main="Nothing changed again!")
>
>
> Has anyone an idea how to achieve a change in the graph layout ?
>
> Best
>
> Franz Quehenberger
> --
> Institute for Medical Informatics, Statistics and Documentation
> Graz, Austria
>
> _______________________________________________
> Bioconductor mailing list
> Bioconductor at stat.math.ethz.ch
> https://stat.ethz.ch/mailman/listinfo/bioconductor
> Search the archives:
> http://news.gmane.org/gmane.science.biology.informatics.conductor
>