[igraph] Re: My dataset for your testing

[Gabor Csardi]

Ok, the problem is that you have a vertex called 'NA' in your 
file and when you read it using 'read.delim()' it is actually
converted to NA in the R sense.

igraph should give an error message, i'll update the code.
The workaround is to use the 'na.strings' argument to 
'read.delim()':

> el <- read.delim("/tmp/hmNR.tsv", na.strings=character())
> el <- el[,1:2]
> el <- as.matrix(el)
> g <- graph.edgelist(el)
> summary(g)
Vertices: 10618 
Edges: 106635 
Directed: TRUE 
No graph attributes.
Vertex attributes: name.
No edge attributes.
> tmp <- is.multiple(g)

G.

On Wed, Apr 23, 2008 at 05:00:17PM -0400, Gang Su wrote:
> Dear Gabor,
> 
> Here's my dataset. Please keep it confidential.
> Try use edgelist to load the graph by first two columns, see whether R 
> crashes;
> or use data.frame to load the graph from the first two columns, then try 
> is.multiple()
> and subgraph, to see whether there's invalid id error.
> 
> Gang
> 

-- 
Csardi Gabor <address@hidden>    UNIL DGM