From: Gábor Csárdi <csardi.gabor_at_gmail.com>

Date: Sun, 16 Nov 2008 15:01:46 +0100

Date: Sun, 16 Nov 2008 15:01:46 +0100

Tom,

On Fri, Nov 14, 2008 at 4:35 PM, Tom Backer Johnsen <backer_at_psych.uib.no> wrote:

> Gabor:

*>
**> Actually, I meant a script GUI management of ugraph I managed to locate on
**> the net.
*

> Disregarding that, thank you for the suggestions. igraph is

*> definitly a non-trivial affair, with a lot of options and corresponding
**> flexibility. I made some changes to what you wrote:
**>
**> A <- matrix(sample(c(-1, 0, 0, 0, 1), 25, replace=T), 5)
**> g <- graph.adjacency(A, mode="directed", weighted=T, diag=F)
**> E(g)$lty <- ifelse(E(g)$weight > 0, 1, 2)
**> tkplot (g, layout=layout.kamada.kawai)
**>
**> This gives me something that is very close to what I want, apart from a
**> suspicion that if the relations between two vertices is non-symmetric, only
**> one of the is shown. Is it possible to have a pair of, say slightly curved
**> arrows as edges between them in that case?
*

Not in the 0.5.1 version, but with the coming 0.6 version this is possible. You can download a preliminary package from here: http://cneurocvs.rmki.kfki.hu/igraph/download/igraph_0.6.tar.gz or if you're using windows, then I can build a windows binary package for you. Let me know if you need one.

To make the edges curved, all you need is adding 'edge.curved=TRUE' to the arguments of plot or tkplot. To make them less curved, specify a number smaller than 0.5, the bigger the number the more curved they will be.

Best,

Gabor

*> Tom
**>
*

> Gábor Csárdi wrote:

*>>
**>> Tom, you mean 'tkplot' in the igraph package? Look at ?igraph.plotting
**>> on how to set up plotting parameters, e.g. if you want different line
**>> types for the positive/negative relations, then you can make use of
**>> the 'lty' parameter:
**>>
**>> A <- matrix(sample(c(-1,0,1), 100, replace=TRUE), 10)
**>> g <- graph.adjacency(A, mode="upper", weighted=TRUE, diag=FALSE)
**>> E(g)$lty <- ifelse(E(g)$weight > 0, 1, 2)
**>> tkplot(g, layout=layout.kamada.kawai)
**>>
**>> Gabor
**>>
**>> On Fri, Nov 14, 2008 at 12:40 PM, Tom Backer Johnsen
**>> <backer_at_psych.uib.no> wrote:
**>>>
**>>> I have a number of (directed) graphs based on social groups, where the
**>>> members have expresed likes and dislikes in respect to the other members.
**>>> tkgraph makes it simple to draw the graphs in a very pleasing way, but I
**>>> would like to differentiate between positive and negative relations in
**>>> the
**>>> graph by having the edges for the negative relations dashed and the
**>>> positive
**>>> ones continuous.
**>>>
**>>> Is that possible? If so how?
**>>>
**>>> Tom
**>>>
**>>> ______________________________________________
**>>> R-help_at_r-project.org mailing list
**>>> https://stat.ethz.ch/mailman/listinfo/r-help
**>>> PLEASE do read the posting guide
**>>> http://www.R-project.org/posting-guide.html
**>>> and provide commented, minimal, self-contained, reproducible code.
**>>>
**>>
**>>
**>>
**>
**>
**> --
**> +----------------------------------------------------------------+
**> | Tom Backer Johnsen, Psychometrics Unit, Faculty of Psychology |
**> | University of Bergen, Christies gt. 12, N-5015 Bergen, NORWAY |
**> | Tel : +47-5558-9185 Fax : +47-5558-9879 |
**> | Email : backer@psych.uib.no URL : http://www.galton.uib.no/ |
**> +----------------------------------------------------------------+
**>
*

-- Gabor Csardi <Gabor.Csardi_at_unil.ch> UNIL DGM ______________________________________________ R-help_at_r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.Received on Sun 16 Nov 2008 - 14:04:40 GMT

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