I suspect that this has nothing to do with read.graph(), and R simply does
not find the file. I am not familiar with specifying a path in windows, but
are you sure you can use slashes instead of backslashes?

Try opening it with readLines() first, I suspect you'll get a similar
error. If it works with readLines(), but not with read.graph(), then you'll
need to send us the file (or a similar file that reproduces the error), and
your platform information.

Gabor


On Sat, Jan 11, 2014 at 11:05 PM, Shelby Renee <[email protected]> wrote:

> I'm trying to convert a txt to GML, months ago the same file worked and I
> was able to make an arcdiagram.  Now I'm receiving the following error
> message in R.
>
> > file = "C:/Rdata/guldata.txt"
> > graph = read.graph(file, format= "gml")
> Error in read.graph.gml(file, ...) :
>   At rinterface.c:4082 : Cannot read GML file, File operation error
> >
>
> Can someone please help me out with this.  Thanks
> Shel
>
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>
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