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Topic: String (computer science)


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In the News (Mon 23 Nov 09)

  
  string - Search Results - MSN Encarta
String, in computer science, a data structure composed of a sequence of characters, usually representing human-readable text.
In computer programming and formal language theory, (and other branches of mathematics), a string is an ordered sequence of symbols.
A string is the vibrating element that is the source of vibration in string instruments, such as the guitar, harp, piano, and members of the violin family
encarta.msn.com /string.html   (237 words)

  
  String (computer science) - Wikipedia, the free encyclopedia
Another issue is that if strings are joined together (especially after having their ends truncated by code not aware of the encoding), the first string may not leave the encoder in a state suitable for dealing with the second string.
The length of a string can be stored implicitly by using a special terminating character; often this is the null character having value zero, a convention used and perpetuated by the popular C programming language.
String functions are used to manipulate a string or change or edit the contents of a string.
en.wikipedia.org /wiki/String_(computer_science)   (2313 words)

  
 ipedia.com: Character string (computer science) Article   (Site not responding. Last check: )
In computer science, the term string may refer to the data type used to represent strings, the data structures used to store them, or the actual data itself (e.g.
Older string implementations were designed to work with the character repertoire and encoding defined by ASCII, or more recent extensions like the ISO 8859 series.
The length of a string can be stored implicitly by using a special terminating character (often NUL, ASCII code 0)—the C programming language uses this convention (see C string)—or explicitly, for example by prefixing the string with integer value (convention used in Pascal).
www.ipedia.com /character_string__computer_science_.html   (1076 words)

  
 SparkNotes: Examples of Recursion: Recursion with the String Library
The manipulation of strings is a perfect testing ground for recursive and iterative techniques, due to their repetitive nature (a sequence of successive characters in memory, terminated by a '\0').
String copy with length restriction: strncpy() This function is to strcpy() as strncmp() is to strcmp(): it will copy from the source string to the destination string no more than the specified number of characters.
String search: strstr() This function searches for one string embedded within another string and returns a pointer in the larger string to the location of the smaller string, returning NULL if the search string was not found.
www.sparknotes.com /cs/recursion/examples/section1.html   (1342 words)

  
 Reference.com/Encyclopedia/String (computer science)
The final issue is that if strings are joined together (especially after having their ends truncated by code not aware of the encoding) the first string may not leave the encoder in a state suitable for dealing with the second string.
The length of a string can also be stored explicitly, for example by prefixing the string with integer value (convention used in Pascal, consequently some people call it a P-string).
On the other hand it does not involve the heap manager and therefore cannot cause a memory leak problem and since string lengths are fixed at compile time it is easy for the compiler to generate code that enforces them.
www.reference.com /browse/wiki/String_(computer_science)   (1876 words)

  
 Category:Computer science - Wikipedia, the free encyclopedia
Computer science is the study of the theoretical foundations of information and computation, and their implementation and application in computer systems.
In practice, computer science includes a variety of topics relating to computers, which range from the abstract analysis of algorithms, formal grammars, etc. to more concrete subjects like programming languages, software, and computer hardware.
As a scientific discipline, it is distinct from mathematics, programming, software engineering, informatics, and computer engineering, although there are significant overlaps and no clear demarcation.
en.wikipedia.org /wiki/Category:Computer_science   (181 words)

  
 String | English | Dictionary & Translation by Babylon
Generally, string is a thin, flexible piece of rope or twine which is used to tie, bind, or hang other objects.
To deprive of strings; to strip the strings from; as, to string beans.
To furnish with strings; as, to string a violin.
www.babylon.com /definition/String   (353 words)

  
 When Is A String Like A String?
Strings and languages are central to computer science and related problems occur in file comparison for example.
The odds-ratio of the strings' being related against their not being related is equal to the binary exponential of the null-theory length minus the r-theory length.
The data for figure 1 were generated by mutating strings with homology one (identical) or zero by various amounts using a mutation model in which changes, inserts and deletes occur in the ratio 2:1:1.
www.csse.monash.edu.au /~lloyd/tildeStrings/Alignment/90.AIM.html   (4458 words)

  
 Department of Computer Science
Computational topology is a classical algorithmic theory going back at least to Dehn (1912).
A string graph is the intersection graph of a set of curves in the plane.
The string graph problem was shown to be decidable by Pach and Toth and independently by Schaefer and the speaker in 2002; both papers put the problem in NEXP.
www.cs.uchicago.edu /events/371   (371 words)

  
 String (computer science) - Psychology Central   (Site not responding. Last check: )
Generally, a string can be placed directly in the code usually by surrounding it with some form of quote marks (usually ' or ", as these are typeable on most keyboards worldwide).
Representations of strings depend heavily on the choice of character repetoire and the method of character encoding.
There are several serious memory management issues with strings, depending on the language theese may be either handled invisiblly by the language or left up to the programmer.
psychcentral.com /psypsych/Literal_string   (2018 words)

  
 What is a string? -- definition by The Linux Information Project (LINFO)
In computer science a string is any finite sequence of characters (i.e., letters, numerals, symbols and punctuation marks).
How strings and string data types are represented depends largely on the character set (e.g., an alphabet) for which they are defined and the method of character encoding (i.e., how they are represented by bits on a computer).
Among these utilities are cat, which is used for concatenating, sort, used for sorting, expand, used to convert tabs to spaces, grep, used for searching, split, used for cutting into pieces, tr used to translate or delete characters, unexpand, used to convert spaces to tabs, and wc, used for counting characters or words.
www.linfo.org /string.html   (724 words)

  
 [No title]
It is believed that these computations are carried out by network of neurons in cortical microcircuits, where each microcircuit is composed of rather stereotypical circuit of neurons within a cortical column.
However it is demonstrated through computer simulations that feedback also provides a significant gain in computational power for quite detailed models of cortical microcircuits with in-vivo-like high levels of noise.
In contrast to previous attractor-based computational models for neural networks, these flexible internal states are {\em high-dimensional} attractors of the circuit dynamics, that still allow the circuit state to absorb new information from online input streams.
www.klab.caltech.edu /~joshi/joshi.bib   (869 words)

  
 String (Advanced Placement Computer Science Java Subset Specification)
If there is a character that differs at the same valid index for both strings, then the character at the smallest such index determines the value returned.
If all valid characters are equal in both strings, then the length of the strings determines the value returned.
0 if the strings are equal, a negative value if this string is less than the argument string, a positive value if this string is greater than the argument string.
www.cs.duke.edu /csed/ap/subset/doc/ap/java/lang/String.html   (502 words)

  
 Laboratory Exercises For Computer Science 151   (Site not responding. Last check: )
While much work with strings does not require access to individual characters within a string, some procedures reference positions in a string.
Since many modern computer systems use passwords as a means to provide protection and security for users, a major issue can be the identification of appropriate passwords.
One approach searches subsequent characters in the string until either an uppercase letter is found or until all letters have been checked.
www.math.grin.edu /~walker/courses/151.fa00/lab-strings.html   (1024 words)

  
 Computer Science News   (Site not responding. Last check: )
Computer Science News continually updated from thousands of sources around the net.
The Association for Computing Machinery announced Wednesday that this year's winner is Peter Naur, who carried out key work in defining the Algol...
Computer scientists in Microsoft have developed a color-coded "dance pad" with buttons you can tap with your feet -- or jump on -- to scroll through electronic files.
www.topix.net /science/computer-science   (624 words)

  
 [No title]
Next, we argue that the lack of system integration exhibited by user-level threads is a consequence of the lack of kernel support for user-level threads provided by contemporary multiprocessor operating systems; we thus argue that kernel threads or processes, as currently conceived, ar the wrong abstraction on which to support user-level management of parallelism.
NAMOS is intended to be used in an environment where unreliable components, such as communication lines and processors, and autonomous control of resources occasionally cause certain objects to become inaccessible, perhaps in the middle of an atomic transaction.
Computations may also suddenly halt (perhaps as the result of a system crash) never to be restarted.
www.cis.upenn.edu /~mbgreen/thesis/nbs.bib   (4848 words)

  
 Citations: Optimal off-line detection of repetitions in a string - Apostolico, Preparata (ResearchIndex)
40] In computer science and molecular biology many algorithms depend on a solution to the following problem: given a word X and a set of arbitrary b 1 suffixes S 1, S b 1 of X, what is the longest common prefix of these suffixes (cf.
A linear algorithm for computing all the squares of a..
Apostolico, A. and Preparata, F. Optimal off-line detection of repetitions in a string, Theoretical Computer Science 22, 297-315.
citeseer.ist.psu.edu /context/45538/0   (3160 words)

  
 [No title]
on Foundations of Computer Science"} @string{focs77 = "Proc.
on Foundations of Computer Science"} @string{focs78 = "Proc.
Computer Science Logic - CSL '93 }, editor={E. Boerger and Y. Gurevich and K. Meinke}, year=1994, publisher = {Springer-Verlag, Lecture Notes in Computer Science 832}, pages={318--333} } @article{Ste95, author={I.~A. Stewart}, title={Complete problems for monotone {NP}}, journal = {Theoretical Comp.
www-mgi.informatik.rwth-aachen.de /FMT/BibTeXDB/ALL.bib   (1653 words)

  
 LHS Computer Science - Programming Assignments   (Site not responding. Last check: )
The null byte that terminates a string is considered to be part of the string.
Space for the new string is obtained from the heap.
It returns a pointer to the string found in the String1 parameter, or a null pointer if the string was not found.
www.onr.com /user/mitchell/lhs/99-00/cs2/programs.html   (655 words)

  
 CiteULike: Algorithms on Strings, Trees, and Sequences: Computer Science and Computational Biology
Algorithms on Strings, Trees, and Sequences: Computer Science and Computational Biology
Traditionally an area of study in computer science, string algorithms have, in recent years, become an increasingly important part of biology, particularly genetics.
TY - BOOK ID - gusfield1997 TI - Algorithms on Strings, Trees, and Sequences: Computer Science and Computational Biology PB - {Cambridge University Press} SN - 0521585198 N2 - {Traditionally an area of study in computer science, string algorithms have, in recent years, become an increasingly important part of biology, particularly genetics.
www.citeulike.org /user/creswick/article/163533   (525 words)

  
 Dynamic programming and sequence alignment
For purposes of answering some important research questions, genetic strings are equivalent to computer science strings — that is, they can be thought of as simply sequences of characters, ignoring their physical and chemical properties.
This, and the fact that two zero-length strings is a local alignment with score of 0, means that in building up a local alignment you don't need to "go into the red" and have partial scores that are negative.
Dynamic programming is maybe the most important use of computer science in biology, but certainly not the only one.
www.ibm.com /developerworks/java/library/j-seqalign/index.html?S_TACT=105AGY01&S_CMP=PODCAST   (5642 words)

  
 Computer Science 311
In the following, "string" means "string of non-terminals and terminals".
A string derives another string in one step by replacing one of the non-terminals in the string with the string on the right-hand side of one of the productions in the grammar.
A sentential form is a string of non-terminals and terminals that can be derived from the start symbol.
www.cs.ubc.ca /spider/norm/cs311/syntax.html   (882 words)

  
 Computational Biology Group
The Computational Biology Group at Columbia develops and applies computational techniques for modeling and understanding biological processes at the molecular level.
String kernel package: implementation of mismatch and profile string kernel code for SVM classification of protein sequences.
"The spectrum kernel: A string kernel for SVM protein classification." Proceedings of the Pacific Symposium on Biocomputing, January 2-7, 2002.
www.ccls.columbia.edu /compbio   (992 words)

  
 Algorithms on Strings, Trees and Sequences - Cambridge University Press
This volume is a comprehensive look at computer algorithms for string processing.
In addition to pure computer science, Gusfield adds extensive discussions on biological problems that are cast as string problems and on methods developed to solve them.
With over 400 exercises to reinforce the material and develop additional topics, the book is suitable as a text for graduate or advanced undergraduate students in computer science, computational biology, or bio-informatics.
www.cambridge.org /us/catalogue/catalogue.asp?isbn=9780521585194   (307 words)

  
 Computer Science - C++   (Site not responding. Last check: )
The include statement tells the compiler that we want acces to all functions and objects in the libraries string and fstream, that handles, respectively, operations on strings (sequences of characters) and operations on file streams (in,out,formatting etc).
But this an allowed and frequently used feature in C. What happens is that every time the conditional is checked a new line from the file is read into the string s, if the length of this string is greater than zero then condition is true, if it is zero the condition is false.
What it does is: it appends the newly read string from our file to the string s.
www.greenman.dk /simple/cs/cpp2.html   (243 words)

  
 Physicists Tackle Knotty Puzzle
A piece of string was dropped into the box and tumbled around like clothes in a dryer.
It notes whether the crossing is under or over, and whether the string follows a path to the left or to the right.
A computer simulation based on this model produced a similar pattern of simple and complex knots as observed in their experiments.
www.sciencedaily.com /releases/2007/10/071003130736.htm   (1189 words)

  
 Computer Science 153 Laboratory Exercises: Strings   (Site not responding. Last check: )
Literal Strings: A string is a sequence of characters.
In this code, characters are examined by moving from the beginning of the string to the end of the string.
A palindrome is a string which reads the same from front to back and from back to front.
www.math.grin.edu /~walker/courses/153.sp02/lab-strings.html   (1087 words)

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