[igraph] Re: igraph crash on windows xp 64 bit system/update

[Gabor Csardi]

Thanks for the report. However, i have:

> library(igraph)
> el <- matrix( c("a", "b", "15c", "46", "76Character", "a"), nc=2)
> graph.edgelist(el)
Vertices: 5 
Edges: 3 
Directed: TRUE 
Edges:
                              
[0] a           -> 46         
[1] b           -> 76Character
[2] 15c         -> a          

It seems to work fine, but this is a Linux, and it is 32 bit.
Will try on 32 bit windows tomorrow, but i don't have access 
to 64 bit windows to try it. :(

G.

On Mon, Apr 21, 2008 at 05:40:55PM -0400, Gang Su wrote:
> After another looking into the issue I found where the problem is
> I have some string node ids began with a number, such as 76Character
> I guess it's not allowed to have a string id began with letter?
> 
> I just prefixed a S_ to all the node names and it just worked.
> If i don't prefix S_ to all nodes, the network may load, but functions 
> like is.multiple will not work as it tells me invalid node ids.
> 
> Maybe the developers can take another look into this issue?
> Thanks
> 
> Gang
> 
> 
> 
> -------------------------------------------------------------
> After looking into the issue it seems that it's some bug with
> graph.edgelist function(i am not sure where is wrong).
> 
> if (is.character(el)) {
>             names <- unique(as.character(t(el)))
>             ids <- seq(names) - 1
>             names(ids) <- names
> 
> #it fails right there, at the graph function
> res <- graph(unname(ids[t(el)]), directed = directed)
>             rm(ids)
>             V(res)$name <- names
>         }
> 
> The bug is:
> If I use graph.data.frame, it works fine.
> If I use numeric ids for edgelist, it works fine.
> If I use character ids for edgelist under 1500~2000 edges, it's fine.
> 
> If I load the entire dataset with graph.edgelist, it crashes, but it's
> working with graph.data.frame.
> 
> I don't know whether this is a R bug or igraph bug.
> 
> 
> Gang
> 
> 
> 
> -------------------
> Hi dear developers,
> 
> I have just migrated my working environment to a 64 bit system.
> One weird issue i encountered is i tried to initialize a graph with
> around 5k edges.
> However, R will crash if I load around 3k edges.
> For example,
> if I use graph(el[1:1000,]), it is fine
> if I use graph(el[1:3000,]), R will crash
> 
> I am now using R 2.6.2 with igraph. I not sure whether this is a igraph
> bug or R bug for the 64 bit system. If you have used igraph on windows
> XP 64 bit system please help!
> thank you very much!
> 
> Gang
> 
> 

-- 
Csardi Gabor <address@hidden>    UNIL DGM