cluster_est_pear(c)n. c[[j]][i] is
the cluster allocation of observation i=1...n at iteration
j=1...N.list:
c_est: a vector of length n. Point estimate of the partition
pear: a vector of length N. pear[j] is the
posterior expected adjusted Rand index associated to partition c[[j]]
similarity: matrix of size n x n. Similarity matrix
(see similarityMat)
opt_ind: the index of the optimal partition
among the MCMC iterations.
similarityMat similarityMatC