Download or read book A Comparison of Approximate String Matching Algorithms written by Petteri Jokinen and published by . This book was released on 1991 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "Experimental comparison of the running time of approximate string matching algorithms for the k differences problem is presented. Given a pattern string, a text string and an integer k, the task is to find all approximate occurrences of the pattern in the text with at most k differences (insertions, deletions, changes). Besides a new algorithm based on suffix automata, we consider six other algorithms based on different approaches including dynamic programming, Boyer-Moore string matching and the distribution of characters. It turns out that none of the algorithms is the best for all values of the problem parameters, and the speed differences between the methods can be large."
Download or read book Theoretical and Empirical Comparisons of Approximate String Matching Algorithms written by University of California, Berkeley. Computer Science Division and published by . This book was released on 1991 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: We study in depth a model of non-exact pattern matching based on edit distance, which is the minimum number of substitutions, insertions, adn deletions needed to transform one string of symbols to another. More precisely, the k differences appr oximate string matching problem specifies a text string of length n, a pattern string of length m, the number k of differences (substitutions, insertions, deletions) allowed in a match, and asks for all locations in the text where a match occurs. We have carefully implemented and analyzed various O(kn) algorithms based on dynamic programming (DP), paying particular attention to dependence on b the alphabet size. An empirical observation on the average values of the DP tabulation makes apparent each algori thm's dependence on b. A new algorithm is presented that computes much fewer entires of the DP table. In practice, its speedup over the previous fastest algorithm is 2.5X for binary alphabet; 4X for four-letter alphabet; 10X for twently- letter alphabet. W e give a probabilistic analysis of the DP table in order to prove that the expected running time of our algorithm (as well as an earlier "cut-off" algorithm due to Ukkonen) is O (kn) for random text. Furthermore, we give a heuristic argument that our algo rithm is O (kn/((the square root of b) -1 )) on the average, when alphabet size is taken into consideration.
Download or read book String Searching Algorithms written by Graham A Stephen and published by World Scientific. This book was released on 1994-10-17 with total page 257 pages. Available in PDF, EPUB and Kindle. Book excerpt: String searching is a subject of both theoretical and practical interest in computer science. This book presents a bibliographic overview of the field and an anthology of detailed descriptions of the principal algorithms available. The aim is twofold: on the one hand, to provide an easy-to-read comparison of the available techniques in each area, and on the other, to furnish the reader with a reference to in-depth descriptions of the major algorithms. Topics covered include methods for finding exact and approximate string matches, calculating ‘edit’ distances between strings, finding common sequences and finding the longest repetitions within strings. For clarity, all the algorithms are presented in a uniform format and notation.
Download or read book Flexible Pattern Matching in Strings written by Gonzalo Navarro and published by Cambridge University Press. This book was released on 2002-05-27 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents recently developed algorithms for searching for simple, multiple and extended strings, regular expressions, exact and approximate matches.
Download or read book A Comparison of String Matching Algorithms written by Eric Lee Hensley and published by . This book was released on 1989 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Automatic Information Organization and Retrieval written by Gerard Salton and published by New York : McGraw-Hill. This book was released on 1968 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: Textbook on methodology of automation in documentation work - covers EDP, computerisation, dictionary construction and operations, storage of and research for information, mathematical analysis and statistical method, evaluation of methodology, etc. Bibliography pp. 485 to 498, and flow diagrams.
Download or read book Practical Methods for Approximate String Matching written by Heikki Hyyrö and published by . This book was released on 2003 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "Given a pattern string and a text, the task of approximate string matching is to find all locations in the text that are similar to the pattern. This type of search may be done for example in applications of spelling error correction or bioinformatics. Typically edit distance is used as the measure of similarity (or distance) between two strings. In this thesis we concentrate on unit-cost edit distance that defines the distance between two strings as the minimum number of edit operations that are needed in transforming one of the strings into the other. More specifically, we discuss the Levenshtein and the Damerau edit distances. Aproximate [sic] string matching algorithms can be divided into off-line and on-line algorithms depending on whether they may or may not, respectively, preprocess the text. In this thesis we propose practical algorithms for both types of approximate string matching as well as for computing edit distance. Our main contributions are a new variant of the bit-parallel approximate string matching algorithm of Myers, a method that makes it easy to modify many existing Levenshtein edit distance algorithms into using the Damerau edit distance, a bit-parallel algorithm for computing edit distance, a more error tolerant version of the ABNDM algorithm, a two-phase filtering scheme, a tuned indexed approximate string matching method for genome searching, and an improved and extended version of the hybrid index of Navarro and Baeza-Yates. To evaluate their practicality, we compare most of the proposed methods with previously existing algorithms. The test results support the claim of the title of this thesis that our proposed algorithms work well in practice."
Download or read book Combinatorial Pattern Matching written by Zvi Galil and published by Lecture Notes in Computer Science. This book was released on 1995-06-21 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents the proceedings of the 6th International Symposium on Combinatorial Pattern Matching, CPM '95, held in Espoo, Finland in July 1995. CPM addresses issues of searching and matching strings and more complicated patterns such as trees, regular expressions, extended expressions, etc. The aim is to derive non-trivial combinatorial properties in order to improve the performance of the corresponding computational problems. This volume presents 27 selected refereed full research papers and two invited papers; it addresses all current aspects of CPM and its applications such as the design and analysis of algorithms for pattern matching problems in strings, graphs, and hypertexts, as well as in biological sequences and molecules.
Download or read book Pattern Matching written by Source Wikipedia and published by University-Press.org. This book was released on 2013-09 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 38. Chapters: Approximate string matching, Backtracking, Comparison of regular expression engines, Compressed pattern matching, Delimiter, Diff, Escape character, Findstr (computing), Find (command), Glob (programming), International Components for Unicode, List of regular expression software, Metacharacter, Parser Grammar Engine, Perl Compatible Regular Expressions, Ragel, ReDoS, RegexBuddy, ReteOO, Rete algorithm, Terminal and nonterminal symbols, Tom (pattern matching language), Wildcard character, Wildmat.
Download or read book An Improved Approximate String Matching Algorithm Based Upon the Boyer moore Algorithm written by 謝一功 and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Approximate String Matching Algorithms in Art Media Archives written by Fernando Casanovas Martín and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Approximate String Matching with Suffix Automata written by Esko Ukkonen and published by . This book was released on 1990 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Animated Comparison of String Matching Algorithms written by Jianyu Zhong and published by . This book was released on 1999 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Algorithms for Approximate String Matching written by Esko Ukkonen and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Combinatorial Pattern Matching written by Alberto Apostolico and published by Lecture Notes in Computer Science. This book was released on 1993-05-18 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: The papers contained in this volume were presented at the Fourth Annual Symposium on Combinatorial Pattern Matching, held in Padova, Italy, in June 1993. Combinatorial pattern matching addresses issues of searching and matching of strings and more complicated patterns such as trees, regular expressions, extended expressions, etc. The goal is to derive nontrivial combinatorial properties for such structures and then to exploit these properties in order to achieve superior performance for the corresponding computational problems. In recent years, a steady flow of high-quality scientific studies of this subject has changed a sparse set of isolated results into a full-fledged area of algorithmics. The area is expected to grow even further due to the increasing demand for speedand efficiency that comes especially from molecular biology and the Genome project, but also from other diverse areas such as information retrieval, pattern recognition, compilers, data compression, and program analysis.
Download or read book Genome Scale Algorithm Design written by Veli Mäkinen and published by Cambridge University Press. This book was released on 2023-10-12 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: Guided by standard bioscience workflows in high-throughput sequencing analysis, this book for graduate students, researchers, and professionals in bioinformatics and computer science offers a unified presentation of genome-scale algorithms. This new edition covers the use of minimizers and other advanced data structures in pangenomics approaches.
Download or read book Algorithms ESA 95 written by Paul Spirakis and published by Springer Science & Business Media. This book was released on 1995-09-13 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book consitutes the proceedings of the Third Annual European Symposium on Algorithms, ESA '95, held in Corfu, Greece in September 1995. The volume presents 42 full revised papers selected during a careful refereeing process from a total of 119 submissions; in addition, there is a prominent keynote address. This year, the scope has been further expanded to new areas of computational endeavour in science; the book covers many aspects of algorithms research and application ranging from combinatorial mathematics to hardware design.
