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Re: [igraph] GraphML in R

From: Gábor Csárdi
Subject: Re: [igraph] GraphML in R
Date: Sun, 10 Jan 2010 20:33:56 +0100


thanks for the wiki page. igraph searches for the program called
xml2-config to find the libxml2 installation. Maybe all you need to do
is to make sure that it is in your PATH. (This is true for Linux and
maybe other Unix-like systems.) Could you please check this?

Otherwise the wiki page is fine, setting the compilation flags always
works. But it is easier to just use xml2-config if your system has it.


On Sat, Jan 9, 2010 at 12:47 AM, Matthew Walker
<address@hidden> wrote:
> Hi,
> I was trying to get GraphML support for the R interface to iGraph.  I
> finally learnt that I must pass to configure the path I used to install
> libxml2.  This took me a wee while to figure out so I have written up a few
> lines on the wiki (http://igraph.wikidot.com/installation-issues) in case
> anyone else has the same desire.  I would love to know if this is the
> "correct" way to get iGraph to work with libxml2 as I was surprised that
> iGraph didn't just take the information offered by pkg-config.
> While doing that however, I noticed that support for GMP was turned off.
>  Out of curiosity I installed GMP but it was still "off" no matter what
> options I passed to ./configure.  I looked at the configure.ac and it
> appears that the line "gmp_support=no" might be the cause.  Setting
> "gmp_support=yes" seems to work.  Is this "no" intentional?  What does GMP
> support offer anyway?
> I then uninstalled igraph from R (using remove.package()) and then followed
> Gabor's instructions on how create an R package [1] however, despite all
> this, I still do not have GraphML support in R:
>> library(igraph)
>> read.graph("~/Desktop/example.graphml.xml", format="graphml")
> Error in read.graph.graphml(file, ...) :
>  At foreign-graphml.c:1033 : GraphML support is disabled, Unimplemented
> function call
> Do you have any suggestions for what I am doing wrong?  I would greatly
> appreciate your help!
> Thanks,
> Matthew
> [1] http://lists.gnu.org/archive/html/igraph-help/2007-04/msg00025.html
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Gabor Csardi <address@hidden>     UNIL DGM

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