Hi everyone,
I have a dataset of friendship with this format:

     ego alter
4746    1     2
9742    1     3
14738   1    NA
4747    2    NA
9743    2    3
14739   2    1
4748    3    13
9744    3   5
14740   3    14
4749    4    NA
9745    4    NA
14741   4    NA
4750    5    NA
9746    5    13
14742   5    10
4751    6   12
9747    6     7
...


NA means that individuals don't select any friend. Does anyone know how to format this dataset to use sna or igraph packages? I don't know how to convert it into a matrix or a edgelist in R without losing isolated individuals .

Next question, anyone knows if there is a package to perform a Moody's Crowds routine to identify groups using R, or other algorithms designed to search groups by maximizing modularity scores?

Thank  you in advance!

--
Sebastián Daza
sebastian.d...@gmail.com

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