Can & Ozkarahan (1990) formula for approximating the number of clusters for a text matrix: (m * n)/t where m and n are the dimensions of the matrix and t is the length of the non-zero elements in matrix A.
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Returns an integer.
Can, F., Ozkarahan, E. A. (1990). Concepts and effectiveness of
the cover-coefficient-based clustering methodology for text databases.
ACM Transactions on Database Systems 15 (4): 483. doi:10.1145/99935.99938.
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