Add weighted transitivity

[Gábor Csárdi]

Based on the Watts (?) paper..... or possibly there is another definition...

[Gábor Csárdi (gabor.csardi)]

There are actually several definition, see www.maths.strath.ac.uk/~aas96106/rep03_2006.pdf
See start with the 'Barrat' version.

[Gábor Csárdi (gabor.csardi)]

Ok, Barrat type weighted transitivity is done, maybe other will follow, maybe not.

[h0cked (timobj)]

It might be me not understanding the code structure... but I can't find Barrat weighted transitivity in the python interface. I do see the c code (igraph_transitivity_barrat1, etc), and I saw the R code does make a reference to the weighted transitivity, however, I can't find the corresponding functions in the python version.

Thanks!

[Tamás Nepusz (ntamas)]

Yup, you're right, this is missing from the Python interface yet. I will add this tomorrow.

[Tamás Nepusz (ntamas)]

Python interface now added as well; Graph.transitivity_local_undirected() and Graph.transitivity_avglocal_undirected() now have an extra keyword argument called "weights". When "weights" is not None, the weighted transitivity as defined by Barrat et al is calculated.

[Gábor Csárdi (gabor.csardi)]

The development of igraph has moved to github, so please do not comment on this bug here. You are of course welcome to comment on github, here:
https://github.com/igraph/igraph/issues/310