How to rename igraph node id when writing to file

Question

I'm trying to write a graph to a file but I'm getting a different node labels than I would like.

Example Code:

g <- graph.star(2)
V(g)$name <- c('homer','marge')
write.graph(g,file = 'g.graphml',format = 'graphml')

Output:

<?xml version="1.0" encoding="UTF-8"?>
<graphml xmlns="http://graphml.graphdrawing.org/xmlns"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://graphml.graphdrawing.org/xmlns
         http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd">
<!-- Created by igraph -->
  <key id="g_name" for="graph" attr.name="name" attr.type="string"/>
  <key id="g_mode" for="graph" attr.name="mode" attr.type="string"/>
  <key id="g_center" for="graph" attr.name="center" attr.type="double"/>
  <key id="v_name" for="node" attr.name="name" attr.type="string"/>
  <graph id="G" edgedefault="directed">
    <data key="g_name">In-star</data>
    <data key="g_mode">in</data>
    <data key="g_center">1</data>
    <node id="n0">                      ###### This should <node id = "homer">
      <data key="v_name">homer</data>
     </node>
     <node id="n1">                     ###### This should <node id = "marge">
      <data key="v_name">marge</data>
     </node>
     <edge source="n1" target="n0"> 
     </edge>
  </graph>
</graphml>

I would like the "node id" attribute to be the names of the nodes (as shown in comments). Anybody have any ideas? Thanks!

AFAIK the "node ID" attribute cannot be the name of the node because there is no guarantee that the IDs you supply are suitable IDs in the GraphML format. The GraphML DTD specifies type `#IDREF` for the `id` attribute, and certain characters are disallowed in `#IDREF`s in an XML file. — Tamás, Jul 24 '14 at 13:39

score 0 · Accepted Answer · answered Jul 24 '14 at 13:13

0

You can't do this currently AFAIK. I am not sure why it is not implemented that way. Can you please open an issue about it at https://github.com/igraph/igraph/issues?state=open ? Thanks.

answered Jul 24 '14 at 13:13

Gabor Csardi

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Hey Gabor, Thanks for the quick reply. I'll open an issue as requested. Thanks for the awesome package btw :) – MagicScout Jul 24 '14 at 13:31
Has the issue been soved at the end? Because I'm having the same malfunctioning behaviour right now. – Andrea Ianni Apr 22 '16 at 12:56

How to rename igraph node id when writing to file

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