How proc optgraph works with graphs with weight?

[LauraMunozCalvo]

I would like to know how proc optgraph acts when you give it a graph with weights. I am doing community detection using Louvain method and community option. I have several pairs of nodes with more tan one link and different weigths. I would want to know if the algorithm adds the weights or what it does with them.

Thanks!

[RobPratt · Accepted solution]

If you have multiple links between the the same pair of nodes, only the first one is used:

https://go.documentation.sas.com/?docsetId=procgralg&docsetTarget=procgralg_optgraph_details01.htm&d...

The log displays a warning in that case:

WARNING: Link (A,B) in observation 2 of the DATA_LINKS= data set is a duplicate and is ignored.

In the next release of PROC NETWORK (the SAS Viya counterpart to PROC OPTGRAPH), multiple links are handled directly in the algorithm.