[igraph] Re: Igraph and SONIA

[Lorenzo Isella]

Hi Gabor,
I myself know very little about SONIA, but according to some 
collaborators of mine (to whom I'll drop a line soon) the SONIA format 
is a de facto standard for evolving networks.
While this may be a bit an exaggeration, I am more than interested in 
finding out more about this format.
I'll check your scripts in the next few days (a bit hectic these days).
Many thanks!

Lorenzo


> Date: Wed, 20 Oct 2010 17:40:03 +0200
> From: G?bor Cs?rdi <address@hidden>
> Subject: Re: [igraph] Igraph and SONIA
> To: Help for igraph users <address@hidden>
> Message-ID:
>         <address@hidden>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Lorenzo, Simone,
>
> here is a function that seems to work on two of the three examples at
> the sonia website:
>
> sonia2igraph <- function(filename, directed=TRUE) {
>   lines <- readLines(filename)
>   lines <- grep("^//", lines, value=TRUE, invert=TRUE)
>   fromid <- grep("^FromId", lines)[1]
>   nodes <- lines[1:(fromid-1)]
>   edges <- lines[fromid:length(lines)]
>
>   nodes <- strsplit(split="\t", nodes)
>   nodesnames <- nodes[[1]]
>   nodes <- data.frame(do.call(rbind, nodes[-1]))
>   colnames(nodes) <- nodesnames
>   colnames(nodes)[1] <- "name"
>
>   edges <- strsplit(split="\t", edges)
>   edgesnames <- edges[[1]]
>   edges <- data.frame(do.call(rbind, edges[-1]))
>   colnames(edges) <- edgesnames
>
>   graph.data.frame(edges, directed=directed, vertices=nodes)
> }
>
> All attributes are added as strings, modify the function if you want
> to convert them to numeric and/or use the igraph attribute names:
> 'color', etc. Clusters are not supported.
>
> The third example file does not work, because it contains multiple
> lines for the same vertex, and I don't know what this means. They do
> not say anything about this on the website, unfortunately.
>
> I have added a bug report for putting (and extended version of) this
> into igraph:
> https://bugs.launchpad.net/igraph/+bug/663959
>
> Best,
> Gabor