Re: [igraph] reverse direction of connections

[Gábor Csárdi]

Not a ticket, but a pull request on github.

It is best if it contains documentation and tests and it should be against the develop branch. Otherwise it might just take too much work for us to include it, considering that the gain is not much.

G.

On Tue, Jul 30, 2013 at 11:56 AM, Sam Steingold <address@hidden> wrote:

Thanks Gabor!
May I humbly suggest that you include this into the next release?

graph.reverse <- function (graph) {
  if (!is.directed(graph))
    return(graph)
  e <- get.data.frame(graph, what="edges")
  ## swap "from" & "to"
  neworder <- 1:length(e)
  neworder[1:2] <- c(2,1)
  e <- e[neworder]
  names(e) <- names(e)[neworder]
  graph.data.frame(e, vertices = get.data.frame(graph, what="vertices"))
}

would you like me to create a ticket for this?

On Mon, Jul 29, 2013 at 4:40 PM, Gábor Csárdi <address@hidden> wrote:
> On Mon, Jul 29, 2013 at 4:33 PM, Sam Steingold <address@hidden> wrote:
>>
>> >>> http://lists.gnu.org/archive/html/igraph-help/2009-03/msg00120.html
>> >> Is there an easy way to reverse direction of connections in a directed
>> >> graph?
>> >el <- get.edgelist(g, names=FALSE)
>> >g2 <- graph(rbind(el[,2],el[,1]))
>> >does the job, except that it loses all attributes.
>>
>> 4 years later, is there a better way (I want to keep the attributes,
>> obviously).
>
>
> get.data.frame() and then graph.data.frame() keeps the attributes.
>
> G.
>
>>
>>
>> Thanks!
>>
>> --
>> Sam Steingold (http://sds.podval.org/) on Ubuntu 13.04 (raring) X
>> 11.0.11303000
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>>
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>
>

--
Sam Steingold <http://sds.podval.org> <http://www.childpsy.net/>