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Topic: Concatenation


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  Dr. Dobb's | Fast, Nonintrusive String Concatenation | May 1, 2004
Before conducting the tests, my expectation was that using the concatenator for sequences of one or two concatenations would actually result in a performance hit, with only longer sequences feeling the benefit of the optimization.
Though the data points for 16 and 32 concatenations are merely academic—if you're writing code with 32 concatenations, you probably need to take a holiday—the savings to be had for up to, say, 8 concatenations are considerable, up to 80 percent.
The concatenation operators of extant string classes can be "upgraded" simply and safely by replacing the existing operators with equivalent versions incorporating the concatenator.
www.ddj.com /dept/cpp/184401816   (3460 words)

  
  Concatenation - Wikipedia, the free encyclopedia
Concatenation is a standard operation in computer programming languages (a subset of formal language theory).
In programming languages, string concatenation is a binary operation usually accomplished by putting a concatenation operator between two strings (operands).
Concatenation of two strings, a and b is denoted as ab or ab.
en.wikipedia.org /wiki/Concatenation   (578 words)

  
 Dictionary.com/Word of the Day Archive/concatenation
She invested a variety of significances in the word "there," a concatenation of linked associations with space, time, and place too.
To most people the point she plays most brilliantly is the episode, which in the novel is merely one of the links in the concatenation of the plot, but in the short story is the form and substance, the very thing itself.
Concatenation is from Late Latin concatenatio, from concatenare, "to chain together," from Latin con-, "with, together" + catena, "a chain, a series."
dictionary.reference.com /wordoftheday/archive/2006/08/03.html   (158 words)

  
 Concatenation   (Site not responding. Last check: 2007-10-26)
The longer name might be the name of a function, variable or type, or a C keyword; it might even be the name of another macro, in which case it will be expanded.
It is also possible to concatenate two numbers (or a number and a name, such as `1.5' and `e3') into a number.
Therefore, you cannot create a comment by concatenating `/' and `*': the `/*' sequence that starts a comment is not a lexical unit, but rather the beginning of a "long" space character.
docs.freebsd.org /info/cpp/cpp.info.Concatenation.html   (442 words)

  
 BCC Concatenation Method - paper for ICSLP '98 Speech Synthesis Workshop
Concatenative synthesis is capable of producing very natural sounding speech which, moreover, closely models the voice quality of the speaker who recorded the corpus from which the concatenation units are drawn.
This makes diphone concatenation an attractive approach for applications which must share limited system resources with other processes and where it is undesirable or impossible to record large speech corpora to support the synthesis.
Although the concatenation unit in BCC is the diphone, the primary unit of speech storage and retrieval is the biphone (i.e., two complete adjacent phonetic segments).
www.asel.udel.edu /speech/workshop.htm   (4522 words)

  
 PHP: String Operators - Manual
The first is the concatenation operator ('.'), which returns the concatenation of its right and left arguments.
The second is the concatenating assignment operator ('.='), which appends the argument on the right side to the argument on the left side.
My example of concatenation and array methods of string building does not include the interstitial logic, which is expected to include conditionals.
www.php.net /manual/en/language.operators.string.php   (360 words)

  
 Efficient String Concatenation in Python
The test case I used is to concatenate a series of integers from zero up to some large number.
Concatenations using this class aren't going to be any faster than normal immutable string operations, and indeed the extra overhead of interpreting the MutableString class methods make this approach a good deal slower.
In the first test 20,000 integers were concatenated into a string 86kb long.
www.skymind.com /~ocrow/python_string   (2212 words)

  
 Virtual concatenation, LCAS benefit next-gen Sonet/SDH nets
Virtual concatenation significantly improves the efficiency of data transport, as well as the scalability of legacy Sonet networks, by grouping the synchronous payload envelopes (SPEs) of Sonet frames in a nonconsecutive manner to create virtual concatenation groups.
This virtual concatenation method allows finer granularity for provisioning of bandwidth services and is an extension of an existing concatenation method, contiguous concatenation, in which groups are presented in a consecutive manner and with gross granularity.
Different granularities of virtual concatenated groups are required for different parts of the network, such as the metro core or metro edge.
www.commsdesign.com /printableArticle/?articleID=16505142   (1311 words)

  
 @ Head : The & operator (Concatenation)
To make string concatenation simpler, for the purposes of operator resolution, all conversions to String are considered to be widening, regardless of whether strict semantics are used.
The dilemma facing VB was the CLI specifications didn't differentiate between Addition and Concatenation.
VB decided that Concatenation and Addition differentiation was important enough that the team forged ahead with their own operator overloading.
msmvps.com /blogs/bill/archive/2006/04/23/92280.aspx   (1040 words)

  
 Concatenation -- from Wolfram MathWorld
Thus the concatenation of the strings "book" and "case" is the string "bookcase".
The concatenation of two or more numbers is the number formed by concatenating their numerals.
For example, the concatenation of 1, 234, and 5678 is 12345678.
mathworld.wolfram.com /Concatenation.html   (108 words)

  
 concatenation - a Whatis.com definition   (Site not responding. Last check: 2007-10-26)
Concatenation (from Latin concatenare, to link together) is taking two or more separately located things and placing them side-by-side next to each other so that they can now be treated as one thing.
In computer programming and data processing, two or more character strings are sometimes concatenated for the purpose of saving space or so that they can be addressed as a single item.
Sometimes new words can be made by concatenating two existing words - for example, "airline" is a concatenation of the words "air" and "line" into a new word.
whatis.techtarget.com /gDefinition/0,294236,sid13_gci214438,00.html   (197 words)

  
 StringBuilder and String Concatenation   (Site not responding. Last check: 2007-10-26)
String concatenation is one of the commonly used operations among programmers.
If you don't handle the string concatenation properly, it may be decrease the performance of an application.
When you add a string to an existing string, the Framework copies both the existing and new data to the memory, deletes the existing string, and reads data in a new string.
www.vbdotnetheaven.com /Code/Jun2003/2011.asp   (824 words)

  
 Copying and Concatenation - The GNU C Library
are concatenated or appended to the end of
Just imagine that ten strings of 100 bytes each have to be concatenated.
For the second string we search the already stored 100 bytes for the end of the string so that we can append the next string.
www.gnu.org /software/libc/manual/html_node/Copying-and-Concatenation.html   (2080 words)

  
 Atlas and more : Are StringBuilders always faster than concatenation?
While it's certainly a very good thing that more and more developers are aware of the performance problems of string concatenation and of how StringBuilder can solve them, it's not as simple as switching to StringBuilder every time you're concatenating more than five strings.
So if you repeatedly concatenate a large number of strings, the memory you're going to spend on that is going to grow roughly with the square of the number of strings.
But as long as you keep your concatenation instructions all in the same instruction (which doesn't prevent you from making it readable using carriage returns and indentations - our VB friends can use the underscore to continue on the next line -), concatenation should be faster in the fixed number of concatenations case.
weblogs.asp.net /bleroy/archive/2005/01/07/348831.aspx   (1149 words)

  
 String concatenation
Space concatenation is performed when two terms are separated by an intervening space.
In the above example the caption and the computation result were concatenated with an intervening space.
Space concatenation is also performed implicitly when an instruction is continued across a line boundary.
www.kilowattsoftware.com /tutorial/rexx/Concatenation.htm   (286 words)

  
 Concatenation Tool
The concatenation tools provides a easy way to concatenate theese files and store it on tape using SAM (Sequential Access via Metadata), a new Data Handling System for CDF.
First of all the script samConcListGenerator tries to determinate which files are to be concatenated and which files are already concatenated: it finds out all the children of a specific file and looks whether al least one child belongs to the outputdataset.
Files with at least one child in the output datset are coniderated already concatenated while file without children in the output datset are put in a list of file to be concatenated.
wwwcdf.pd.infn.it /skim/concatenation.html   (679 words)

  
 Efficient Type Inference for Record Concatenation and Subtyping
Record concatenation, multiple inheritance, and multiple-object cloning are closely related and part of various language designs.
For example, in Cardelli's untyped Obliq language, a new object can be constructed from several existing objects by cloning followed by concatenation; an error is given in case of field name conflicts.
Type systems for record concatenation have been studied by Wand, Harper and Pierce, Remy, and others; and type inference for the combination of record concatenation and subtyping has been studied by Sulzmann and by Pottier.
www.cs.purdue.edu /homes/tzhao/record-concatenation/arrow.htm   (296 words)

  
 SAS Catalogs : Catalog Concatenation
is a concatenation that is specified by the global CATNAME statement in which the catalogs to be concatenated are specifically (or explicitly) named.
In implicit concatenation, any catalogs that happen to have the same name in their respective libraries are concatenated when those libraries are concatenated.
The rules for catalog concatenation are the same, whether the the catalogs are implicitly or explicitly concatenated.
www.asu.edu /sas/sasdoc/sashtml/lrcon/z1050164.htm   (557 words)

  
 sci.crypt: Re: Making a weak Hash stronger until a fix comes along -- concatenation of hash functions... .2: ...
Making a weak Hash stronger until a fix comes along -- concatenation of hash functions...
Also the approach string concatenation leaves a lot to be desired (see...
>that it is the concatenation of the languages these sets represent...
www.derkeiler.com /Newsgroups/sci.crypt/2005-09/1204.html   (410 words)

  
 VC: Virtual Concatenation   (Site not responding. Last check: 2007-10-26)
Virtual Concatenation is a technique that allows SONET channels to be multiplexed together in arbitrary arrangements.
All the intelligence to handle virtual concatenation is located at the endpoints of the connections, so each SONET channel may be routed independently through the network without it requiring any knowledge of the virtual concatenation.
In this manner, virtually concatenated channels may be deployed on the existing SONET/SDH network with a simple endpoint upgrade.
www.javvin.com /protocol/VC.html   (155 words)

  
 [tw] : Optimal String Concatenation in UserTalk
Warning: If you don't write software, or at least use Radio UserLand or Userland Frontier on a regular basis, this essay is likely to bore you to death.
A new string is created that is the the concatenation of s and cr.
There are two goals when concatenating strings: trigger the secret "in-place append" by making our string concatenation look like a simple "x = x + y", and make as few copies of our strings as possible.
www.truerwords.net /articles/ut/optimalstringconcat.html   (635 words)

  
 concatenation - OneLook Dictionary Search
Concatenation : A Glossary of Mathematical Terms [home, info]
Phrases that include concatenation: a concatenation, concatenation sequences, string concatenation, tandem or concatenation
Words similar to concatenation: chain, concatenate, mesh, more...
www.onelook.com /?w=concatenation   (239 words)

  
 What is concatenate? - A Word Definition From the Webopedia Computer Dictionary
For example, concatenating the three words in, as, and much yields the single word inasmuch.
Computer manuals often refer to the process of concatenating strings, a string being any series of characters.
You can also concatenate files by appending one to another.
www.webopedia.com /TERM/C/concatenate.html   (67 words)

  
 GAP Manual: 27.19 Concatenation   (Site not responding. Last check: 2007-10-26)
Each list may also contain holes, in which case the concatenation also contains holes at the corresponding positions.
gap> Concatenation([ 1, 2, 3 ], [ 4, 5 ]); [ 1, 2, 3, 4, 5 ] gap> Concatenation([2,3,,5,,7], [11,,13,,,,17,,19]); [ 2, 3,, 5,, 7, 11,, 13,,,, 17,, 19 ]
The result is a new list, that is not identical to any other list.
www-groups.dcs.st-and.ac.uk /~gap/Gap3/Manual3/C027S019.htm   (160 words)

  
 String Concatenation/Performance and Improving Java I/O Performance
An implementation may choose to perform conversion and concatenation in one step to avoid creating and then discarding an intermediate String object.
To increase the performance of repeated string concatenation, a Java compiler may use the
For more information about this topic, see Section 15.18.1, String Concatenation Operator +, in "The Java Language Specification Second Edition", and Chapter 5, Strings, in "Java Performance Tuning" by Jack Shirazi.
java.sun.com /developer/JDCTechTips/2002/tt0305.html   (2182 words)

  
 In the line of Fire.. : How StringBuilder string concatenation affects performance , string builder vs string ...   (Site not responding. Last check: 2007-10-26)
There is a major flaw in using string concatenation as against the String builders append concerning performance only.
lets take a case where we are concatenating 2 strings and assigning the output to a 1
Note :- The point to remember here is that using StringBuilder for a concatenation of 2-3 strings doesnt make a significant difference in the performance but when you have numerous strings then the usage of StringBuilder has a big positive Impact on the performance
dotnetjunkies.com /WebLog/shaunakp/articles/59532.aspx   (385 words)

  
 Understanding String Concatenation in VBScript - adOpenStatic.com
Recently on the Wrox Pro-ASP list there was some discussion on which was faster: multiple string concatenations followed by a single Response.Write() call, multiple concatenations within a Response.Write() call, or multiple calls of Response.Write().
Because VBScript uses arrays to handle string concatenation, and redimensioning arrays in VBScript is extremely inefficient.
Steps 2 and 6 are very expensive and basically result in the entire concatenated result being copied twice with additional overhead to allocate and de-allocate memory.
www.adopenstatic.com /experiments/stringconcatenation.asp   (332 words)

  
 SQL Server DataTypes and Conversion and Concatenation 2 - dBforums
If you would prefer not to see any double-underlined words and corresponding advertisements, please click here.
I want to be able to concatenate the first 11 into the
The problem is I am converting the 10th and 11th fields into varchar(1500) fields.
www.dbforums.com /showthread.php?t=354320   (1247 words)

  
 HOW TO: Improve String Concatenation Performance in JScript .NET
When strings are being concatenated, the + concatenation operator builds a new string each time.
A large amount of string concatenation that uses the + operator may affect performance.
If your computer is in an environment that supports streaming the data (such as in an ASPX Web Form), or your application is writing the data to a hard disk, you can avoid the buffer overhead of concatenation or the StringBuilder class by writing the data directly to the stream.
support.microsoft.com /default.aspx?kbid=306823   (481 words)

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