Re: [graph-tool] Generating random graphs with arbitrary specified degree distribution
"Rui Carvalho" <rui.carvalho@ucl.ac.uk> writes:
Hello,
I'd like to use graph-tool to generate random graphs obeying example (d) from Newman et al., PRE 64, 026118.
Basically, there are 1000 people and each person knows between zero and five others, the number of people in each category being from zero to five:{86,150,363,238,109,54} -this is the histogram.
Can I use graph-tool to generate graphs with this pdf a la Newman et al.? Did I miss an example in the documentation detailing how to do this?
Also can I use graph tool to generate random graphs *exactly* with this degree sequence as in the configurational model?
With graph-tool you can specify the sampling function for the degrees, so you could (inside your function) simply sample one degree from each bucket, and subtract from one from it, and stop when it's empty. This implies also that you could supply a function which "samples" in a specific sequence, and thus achieves what you asked for in the second question. For details on how to implement this see this part of the documentation: http://projects.forked.de/graph-tool/wiki/RandomGraphGeneration#Moreelaborat... Cheers, Tiago -- Tiago de Paula Peixoto <tiago@forked.de>
Hi Tiago, The reason why I want to do this is I have a "real world" network and would like to benchmark it against random networks. I had a look at the documentation and it didn't seem oriented towards this task -correct me if I'm wrong, but it sounds too difficult? I'm not sure whether this would be of interest to others, but if the answer would be yes, than perhaps we could have it easier in a future release? Or maybe I'm just missing the point -anyway, graph-tool is a great program :) Cheers, Rui -----Original Message----- From: graph-tool-bounces@forked.de [mailto:graph-tool-bounces@forked.de] On Behalf Of Tiago de Paula Peixoto Sent: 07 March 2008 23:42 To: Main discussion list for the graph-tool project Subject: Re: [graph-tool] Generating random graphs with arbitrary specified degree distribution "Rui Carvalho" <rui.carvalho@ucl.ac.uk> writes:
Hello,
I'd like to use graph-tool to generate random graphs obeying example (d) from Newman et al., PRE 64, 026118.
Basically, there are 1000 people and each person knows between zero and five others, the number of people in each category being from zero to five:{86,150,363,238,109,54} -this is the histogram.
Can I use graph-tool to generate graphs with this pdf a la Newman et al.? Did I miss an example in the documentation detailing how to do this?
Also can I use graph tool to generate random graphs *exactly* with this degree sequence as in the configurational model?
With graph-tool you can specify the sampling function for the degrees, so you could (inside your function) simply sample one degree from each bucket, and subtract from one from it, and stop when it's empty. This implies also that you could supply a function which "samples" in a specific sequence, and thus achieves what you asked for in the second question. For details on how to implement this see this part of the documentation: http://projects.forked.de/graph-tool/wiki/RandomGraphGeneration#Moreelaborat edistributions Cheers, Tiago -- Tiago de Paula Peixoto <tiago@forked.de> _______________________________________________ graph-tool mailing list graph-tool@forked.de http://lists.forked.de/mailman/listinfo/graph-tool
participants (2)
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Rui Carvalho -
Tiago de Paula Peixoto