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## [igraph] Problems with constraint calculation in igraph python library

**From**: |
Eytan Bakshy |

**Subject**: |
[igraph] Problems with constraint calculation in igraph python library |

**Date**: |
Tue, 26 Feb 2008 00:22:31 -0500 |

Hello,

`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.
`
For example, in python, if I take some graph, say,
In[66]: g = Graph.Barabasi(100,3)

`and take the union (set) of the list returned by g.constraint(), the
``only values returned are 0 and 1:
` In[67]: set(g.constraint())
Out[67]: set([0, 1]))
But in R, if I do a similar sequence of commands,
> g <- barabasi.game(100,1,m=3)
> unique(constraint(g))
I get a good 70-80 unique values.

`Is there something wrong with the way I am invoking constraint in
``python, or are there some known issues with the method?
`
Thanks,
Eytan

**[igraph] Problems with constraint calculation in igraph python library**,
*Eytan Bakshy* **<=**