Combine Networks by Edge Value Addition
Given a series of networks, sum.network
attempts to form a new
network by accumulation of edges. If a non-null attrname
is given,
the corresponding edge attribute is used to determine and store edge values.
## S3 method for class 'network' sum(..., attrname = NULL, na.rm = FALSE)
... |
one or more |
attrname |
the name of an edge attribute to use when assessing edge values, if desired. |
na.rm |
logical; should edges with missing data be ignored? |
The network summation method attempts to combine its arguments by addition
of their respective adjacency matrices; thus, this method is only applicable
for networks whose adjacency coercion is well-behaved. Addition is
effectively boolean unless attrname
is specified, in which case this
is used to assess edge values – net values of 0 will result in removal of
the underlying edge.
Other network attributes in the return value are carried over from the first element in the list, so some persistence is possible (unlike the addition operator). Note that it is sometimes possible to “add” networks and raw adjacency matrices using this routine (if all dimensions are correct), but more exotic combinations may result in regrettably exciting behavior.
A network
object.
Carter T. Butts buttsc@uci.edu
Butts, C. T. (2008). “network: a Package for Managing Relational Data in R.” Journal of Statistical Software, 24(2). https://www.jstatsoft.org/v24/i02/
#Create some networks g<-network.initialize(5) h<-network.initialize(5) i<-network.initialize(5) g[1,,names.eval="marsupial",add.edges=TRUE]<-1 h[1:2,,names.eval="marsupial",add.edges=TRUE]<-2 i[1:3,,names.eval="marsupial",add.edges=TRUE]<-3 #Combine by addition pouch<-sum(g,h,i,attrname="marsupial") pouch[,] #Edge values in the pouch? as.sociomatrix(pouch,attrname="marsupial") #Recover the marsupial
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