[R] Rgraphviz - neato layout - edge weights do not have an effect

From: Franz Quehenberger <franz.quehenberger_at_meduni-graz.at>
Date: Mon 28 Aug 2006 - 18:56:11 EST


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")

# 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

-- 
--
Franz Quehenberger
Institute for Medical Informatics, Statistics and Documentation
Graz, Austria

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Received on Mon Aug 28 19:02:10 2006

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