graph_from_adjacency_matrix function from the igraph package to convert the network in sparse adjacency matrix format into igraph network object.sparseAdjMat.to.igraph(sparseAdjMat, mode = "directed")dgCMatrix from package Matrix).
NOTE: for directed graphs the friend IDs pointing into vertex i are assumed to be listed in the column i
igraph::graph_from_adjacency_matrix, specifies how igraph should interpret the supplied matrix.
See ?igraph::graph_from_adjacency_matrix for details.DAG.net.network; igraph.to.sparseAdjMat; sparseAdjMat.to.NetInd; NetInd.to.sparseAdjMat;