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Computes Jaccard distances between the columns of a 0-1-matrix.
jaccard(mat)
0-1-matrix.
A distance matrix
Missing values are allowed, and are excluded from all computations involving the cols within which they occur.
Jaccard, P. (1908), Nouvelles recherches sur la distribution lorale, Bull. Soc. Vaud. Sci. Nat., 44, 223-270.