cltoSim function

Compute Similarity Matrix for a Clustering and vice versa

A similarity matrix is a symmetric matrix whose entry $[i,j]$ is 1 if observation i

and j are in the same cluster and 0 otherwise.

cltoSim(cl)
Simtocl(Sim)

Arguments

• cl: vector of cluster memberships
• Sim: similarity matrix

Warning

Simtocl does not check whether Sim is a valid similarity matrix, e.g. that Sim[i,j]==1 if Sim[i,k]==1 and Sim[j,k]==1.

Author(s)

Arno Fritsch, arno.fritsch@tu-dortmund.de

See Also

comp.psm for an average similarity matrix.

Examples

cl <- c(3,3,1,2,2)
(Sim <- cltoSim(cl))
Simtocl(Sim) 

# not a valid similarity matrix
(Sim2 <- matrix(c(1,0,1,0,1,1,1,1,1), ncol=3))
Simtocl(Sim2) # no warning