Remove Elements from a Network Object
delete.edges removes one or more edges (specified by their internal ID numbers) from a network;
delete.vertices performs the same task for vertices (removing all associated edges in the process).
an object of class
a vector of edge IDs.
a vector of vertex IDs.
Note that an edge's ID number corresponds to its order within
x$mel. To determine edge IDs, see
get.edgeIDs. Likewise, vertex ID numbers reflect the order with which vertices are listed internally (e.g., the order of
x$iel, or that used by
as.matrix.network.adjacency). When vertices are removed from a network, all edges having those vertices as endpoints are removed as well. When edges are removed, the remaining edge ids are NOT permuted and
NULL elements will be left on the list of edges, which may complicate some functions that require eids (such as
set.edge.attribute). The function
valid.eids provides a means to determine the set of valid (non-NULL) edge ids.
Edges can also be added/removed via the extraction/replacement operators. See the associated man page for details.
Invisibly, a pointer to the updated network; these functions modify their arguments in place.
Carter T. Butts email@example.com
Butts, C. T. (2008). “network: a Package for Managing Relational Data in R.” Journal of Statistical Software, 24(2). http://www.jstatsoft.org/v24/i02/
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#Create a network with three edges m<-matrix(0,3,3) m[1,2]<-1; m[2,3]<-1; m[3,1]<-1 g<-network(m) as.matrix.network(g) delete.edges(g,2) #Remove an edge as.matrix.network(g) delete.vertices(g,2) #Remove a vertex as.matrix.network(g) #Can also remove edges using extraction/replacement operators g<-network(m) g[1,2]<-0 #Remove an edge g[,] g[,]<-0 #Remove all edges g[,]
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