Re: [R] igraph and tkgraph

From: Tom Backer Johnsen <backer_at_psych.uib.no>
Date: Sun, 16 Nov 2008 19:11:57 +0100

Gábor Csárdi wrote:
> 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.

>
> Oh, ok, it will be part of igraph from the next version. But its
> capabilities are very limited. We are considering writing a
> full-fledged GUI to igraph, but I haven't found the right tools for it
> yet, so this will happen only next year I think.

Unfinished it may be, but nevertheless a potentially very interesting tool.
>

>> 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.

Yes, thank I would like to have a Windows binary if possible, but do not feel rushed. It is not urgent in any way.
>
> 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.

First class!

Tom
>
> 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
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>>>> 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/ |
>> +----------------------------------------------------------------+
>>

>
>
>
-- 
+----------------------------------------------------------------+
| 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/ |
+----------------------------------------------------------------+

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Received on Sun 16 Nov 2008 - 18:14:35 GMT

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