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Re: [igraph] Accessing/setting all vertex attributes at the same time

From: Gábor Csárdi
Subject: Re: [igraph] Accessing/setting all vertex attributes at the same time
Date: Wed, 8 Dec 2010 13:32:06 +0100

Hi Florian,

here are two functions for retrieving and setting all vertex attributes at once:

get.vertex.attributes <- function(graph) {
  as.data.frame(unclass(graph)[[9]][[3]], stringsAsFactors=FALSE)

set.vertex.attributes <- function(graph, attr) {
  g2 <- unclass(graph)
  g2[[9]][[3]] <- as.list(attr)
  class(g2) <- "igraph"

But note that 'get.vertex.attributes' only works if you can really
convert vertex attributes to a data frame. It might not work if you
have complex vertex attributes. Also, 'set.vertex.attributes' does not
do any checks that 'attr' has the right number of rows, you add this
if you like.


On Tue, Dec 7, 2010 at 11:09 AM, Florian Markowetz
<address@hidden> wrote:
> Hi igraph-list,
> I am using the R interface to igraph.
> R version 2.12.0 (2010-10-15)
> Platform: i386-apple-darwin9.8.0/i386 (32-bit)
> igraph_0.5.5
> Now here is my problem: I'm having a graph and several attributes for each
> vertex. I want to set and access all attributes at the same time, without
> using a loop or an apply.
> Here is a simple example. Imagine the following was my data (in reality my
> graph has ~3000 nodes and each node has ~1000 attributes):
>> g <- barabasi.game(10)
>> vertexAnno <- data.frame(
>    alias=LETTERS[1:10],
>    domain=letters[1:10],
>    value=rnorm(10)
>    )
> How do I set all vertex attributes in one go and avoid something like:
>> for (i in colnames(vertexAnno)) g <-
> set.vertex.attribute(g,i,value=vertexAnno[,i])
> And once the attributes are set, how do I retrieve them again as one
> dataframe? I don't want to loop over get.vertex.attribute().
> Thanks a lot for your help!
> Florian
> PS: When I tried checking the email archives I only got to an
> 'unavailable'-page. So I apologize if this question got answered recently.
> --
> Florian Markowetz
> Cancer Research UK
> Cambridge Research Institute
> Li Ka Shing Centre
> Robinson Way, Cambridge, CB2 0RE, UK
> phone: +44 (0) 1223 40 4315
> email: address@hidden
> web  : http://www.markowetzlab.org
> skype: florian.markowetz
> This communication is from Cancer Research UK. Our website is at 
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Gabor Csardi <address@hidden>     UNIL DGM

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