Figure 2

(A) Initial Similarity matrix of 1329 × 1329 dimensions. The similarity colour scale is shown at the right of the matrix. S is obtained from the set of co-occurrence vectors. Note that S is symmetric, positive, and its values are ranked between 0 and 1. (B) Distribution of the similarity values. The distribution shows that S is sparse and depicts a general view of the structure of the search space for the clustering of S.