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Re: [igraph] Problems with constraint calculation in igraph python libra

From: Tamas Nepusz
Subject: Re: [igraph] Problems with constraint calculation in igraph python library
Date: Tue, 26 Feb 2008 07:57:01 +0100

Dear Eytan,

I am using the latest version of igraph for python 2.5 (v0.5) under mac os x 10.5, and the Burt constraint calculation only seems to yield 0's or 1's for each node's constraint, for both synthetic and empirical networks.

Thanks for reporting that, this is definitely a bug. However, it's easy to fix. If you are able to recompile the Python interface from scratch, you'll only have to search for igraphmodule_Graph_constraint in src/graphobject.c and replace the following line at the end of the function:

list = igraphmodule_vector_t_to_PyList(&result, IGRAPHMODULE_TYPE_INT);

The correct version is:

list = igraphmodule_vector_t_to_PyList(&result, IGRAPHMODULE_TYPE_FLOAT);

If you are not able to re-compile it, just tell me and I'll send you a patched version.

Best regards,

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