simcausal network IDs matrix (NetInd_k).sparseAdjMat.to.NetInd(sparseAdjMat)dgCMatrix from package Matrix).
NOTE: The friends (row numbers) of observation i are assumed to be listed in column i
(i.e, which(sNetInd_k; 2) nF; and 3) Kmax.
1) NetInd_k - matrix of network IDs of dimension (n=nrow(sparseAdjMat),Kmax), where each row i consists of the network IDs (friends) for observation i.
Remainders are filled with NAs.
2) nF - integer vector of length n specifying the number of friends for each observation.
3) Kmax - integer constant specifying the maximum observed number of friends in input sparseAdjMat (this is the column dimension for the output matrix NetInd_k).network; NetInd.to.sparseAdjMat; sparseAdjMat.to.igraph; igraph.to.sparseAdjMat;