Gábor Csárdi wrote:
Tom,
On Fri, Nov 14, 2008 at 4:35 PM, Tom Backer Johnsen <[EMAIL PROTECTED]> 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
<[EMAIL PROTECTED]> 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
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--
+----------------------------------------------------------------+
| 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 : [EMAIL PROTECTED] URL : http://www.galton.uib.no/ |
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--
+----------------------------------------------------------------+
| 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 : [EMAIL PROTECTED] URL : http://www.galton.uib.no/ |
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