> file, then use dotty or dot to visualize. You may need > to tweak the GXL to get gxl2dot to succeed with the > toGXL dump. > > example: > > library(graph) > example(graphNEL) > cat(saveXML(toGXL(gR)),file="goo.gxl") Let me be a bit more explicit about this. if you issue the commands mentioned here, goo.gxl will have the following contents, if you are using an XML built with libxml 1.*: (see also XML2 below if you are a libxml2 user, which you can determine by running libxmlVersion() and noting the major element) <gxl> <graph id="graphNEL"> <node id="A"/> <node id="B"/> <node id="C"/> <node id="D"/> <edge id="e1" from="A" to="D"/> <edge id="e2" from="B" to="C"/> <edge id="e3" from="C" to="B"/> <edge id="e4" from="D" to="A"/> </graph> </gxl> this will not be processed by gxl2dot because it lacks an edgemode attribute in the graph node. in fact, on my machines it causes a segmentation fault to lack the edgemode attribute. so change the third record to <graph id="graphNEL" edgemode="directed"> and now gxl2dot will emit digraph graphNEL { A -> D [_gxl_id=e1]; B -> C [_gxl_id=e2]; C -> B [_gxl_id=e3]; D -> A [_gxl_id=e4]; } save that to a file and run dotty on the file, and you can reorient and modify the graph interactively. this functionality is at an early stage -- if people are finding that features of their graph objects are not properly propagated, let us know and we will try to cover the needs. --- XML2: if you have an XML package installation based on libxml2, the result will also contain a second record sadly, R::XML has emitted a defective DTD reference (it should be ), and this is flagged as a "syntax error" by gxl2dot. just remove the DOCTYPE node, you don't need it.