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Detecting Approximate Periodic Patterns

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Part of the Lecture Notes in Computer Science book series (LNTCS,volume 7659)

Abstract

Given ε ∈ [0, 1), the ε-Relative Error Periodic Pattern Problem (REPP) is the following:

INPUT: An n-long sequence S of numbers s i  ∈ ℕ in increasing order.

OUTPUT: The longest ε-relative error periodic pattern, i.e., the longest subsequence \(s_{i_1}, s_{i_2},\ldots, s_{i_k}\) of S, for which there exists a number p such that the absolute difference between any two consecutive numbers in the subsequence is at least p and at most p(1 + ε).

The best known algorithm for this problem has O(n 3) time complexity. This bound is too high for large inputs in practice. In this paper we give a new algorithm for finding the longest ε-relative error periodic pattern (the REPP problem). Our method is based on a transformation of the input sequence into a different representation: the ε-active maximal intervals list L, defined in this paper. We show that the transformation of S to the list L can be done efficiently (quadratic in n and linear in the size of L) and prove that our algorithm is linear in the size of L. This enables us to prove that our algorithm works in sub-cubic time on inputs for which the best known algorithm works in O(n 3) time. Moreover, though it may happen that our algorithm would still be cubic, it is never worse than the known O(n 3)-algorithm and in many situations its complexity is O(n 2) time.

Keywords

  • Input Sequence
  • Arithmetic Progression
  • Periodic Pattern
  • Maximal Interval
  • Active Interval

These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Amir, A., Apostolico, A., Eisenberg, E., Landau, G.M., Levy, A., Lewenstein, N. (2012). Detecting Approximate Periodic Patterns. In: Even, G., Rawitz, D. (eds) Design and Analysis of Algorithms. MedAlg 2012. Lecture Notes in Computer Science, vol 7659. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-34862-4_1

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  • DOI: https://doi.org/10.1007/978-3-642-34862-4_1

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-34861-7

  • Online ISBN: 978-3-642-34862-4

  • eBook Packages: Computer ScienceComputer Science (R0)