Re: [igraph] partially directed network

[Gabor Csardi]

Rainer, thanks, i'm planning to rewrite visualization and then perhaps
it will be really good. :)

igraph does not support mixed graphs, so there is no way currently, 
you need to redefine plot.igraph, but it is trivial.
It possible to add an "edge.direction=NULL" parameter and then in plot.igraph
modify line

  arrow.code <- ifelse(is.directed(graph), 2, 0)

to

  if (is.null(edge.direction)) {
    arrow.code <- ifelse(is.directed(graph), 2, 0)
  } else {
    arrow.code <- edge.direction
  }    

and you can set edge.direction to whatever you want. I'll include
this in the next release but that might take a couple of months, i
don't know yet. Also, then the same should be added to tkplot.
I'll send you the development version after adding this, if you're
interested but don't want to download the igraph source.

Is this good enough?
Gabor

ps. please consider joining the mailing list. I let your 
messages through, but non-subscriber posts are not allowed to 
avoid spam.

On Thu, Mar 08, 2007 at 05:40:53PM +0100, Rainer Opgen-Rhein wrote:
> I want to visualize a network in which a part of the edges are directed, 
> others are not. Is this possible with igraph? It would really help me, 
> as igraph visualization is really great.
> As I do not intend to calculate with the network, but only visualize it, 
> a "dirty" method would also be alright. For example I tried to look for 
> an option to set the size of specific arrow heads to zero, but I found 
> none.
> 
> Thanks for your help!
> 
> Rainer
> 
> 
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-- 
Csardi Gabor <address@hidden>    MTA RMKI, ELTE TTK