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On the possible patterns of inputs for block sorting in the Burrows-Wheeler transformation
Authors:Takashi Saso  Atsuyoshi Nakamura
Affiliation:a Graduate School of Engineering, Soka University, 1-236, Tangi-cho, Hachioji-shi, Tokyo, 192-8577, Japan
b Graduate School of Information Science and Technology, Hokkaido University, Kita 14, Nishi 9, Kita-ku, Sapporo, Hokkaido, 060-0814, Japan
Abstract:Block sorting in the Burrows-Wheeler transformation is to sort all of the n circular shifts of a string of length n lexicographically. We introduce a notion called the width of a sequence of n strings of length n and show that the values of widths are very different between the two types of sequences of strings; (1) a sequence of n randomly generated strings of length n, and (2) the sequence of n circular shifts of a randomly generated string of length n.
Keywords:Burrows-Wheeler transformation   Block sorting   Suffix arrays   Data compression   Analysis of algorithms
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