Two-mode network conversions

Description

Coverting two mode networks from two to one mode matrix representation and vice versa. If a two-mode matrix is converted in-to a one-mode matrix, the original two-mode matrix lies in the upper right corner of the one-mode matrix.

Usage

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Arguments

M

A matrix representing the (usually valued) network.

clu

A partition. Each unique value represents one cluster. This should be a list of two vectors, one for each mode.

Value

Functions returns list with elemets: a mode mode matrix with the two mode network in its upper left corner.

M

The matrix

clu

The partition, in form appropriate for the mode of the matrix

Author(s)

Aleš Žiberna

See Also

crit.fun, opt.par, opt.random.par, plot.mat

Examples

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#generating a simple network corresponding to the simple Sum of squares
#structural equivalence with blockmodel:
# null com
# null null
n<-c(7,13)
net<-matrix(NA,nrow=n[1],ncol=n[2])
clu<-list(rep(1:2,times=c(3,4)),rep(1:2,times=c(5,8)))
tclu<-lapply(clu,table)
net[clu[[1]]==1,clu[[2]]==1]<-rnorm(n=tclu[[1]][1]*tclu[[2]][1],
   mean=0,sd=1)
net[clu[[1]]==1,clu[[2]]==2]<-rnorm(n=tclu[[1]][1]*tclu[[2]][2],
   mean=4,sd=1)
net[clu[[1]]==2,clu[[2]]==1]<-rnorm(n=tclu[[1]][2]*tclu[[2]][1],
   mean=4,sd=1)
net[clu[[1]]==2,clu[[2]]==2]<-rnorm(n=tclu[[1]][2]*tclu[[2]][2],
   mean=0,sd=1)
plot.mat(net,clu=clu) #two mode matrix of a two mode network
#converting to one mode network
M1<-two2one(net)$M
plot.mat(M1,clu=two2one(net)$clu) #plotting one mode matrix
plot.mat(one2two(M1,clu=clu)$M,clu=clu)
#converting one to two mode matix and ploting