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• question about complex values in java

  - by davit-datuashvili

  We know that the general form of complex numbers is like this: z=a+i*b, where i is sqrt(-1). I have a question about how to express this in Java ?

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• Is it bad to explicitly compare against boolean constants e.g. if (b == false) in Java?

  - by polygenelubricants

  Is it bad to write: if (b == false) //... while (b != true) //... Is it always better to instead write: if (!b) //... while (!b) //... Presumably there is no difference in performance (or is there?), but how do you weigh the explicitness, the conciseness, the clarity, the readability, etc between the two? Note: the variable name b is just used as an example, ala foo and bar.

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• Can I call DbDataAdapter.Fill with a DbDataAdapter.SelectCommand that has a inner join to populate

  - by matti

  or do I have to use 2 separate DbDataAdapters with single-table Selects and then use DataRelations? like: SELECT Persons.LastName, Persons.FirstName, Orders.OrderNo FROM Persons INNER JOIN Orders ON Persons.P_Id=Orders.P_Id ORDER BY Persons.LastName I can't yet try this. I'm designing a xml config file schema for a general program so it would help a lot! -cheers & BR: Matti

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• Drawbacks of Dynamic Query in Sqlserver 2005 ?

  - by KuldipMCA

  I have using the many dynamic Query in my database for the procedures because my filter is not fix so i have taken @filter as parameter and pass in the procedure. Declare @query as varchar(8000) Declare @Filter as varchar(1000) set @query = 'Select * from Person.Address where 1=1 and ' + @Filter exec(@query) Like that my filter contain any Field from the table for comparison. It will affect my performance or not ? is there any alternate way to achieve this type of things

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• Installing ExcelPackage with Visual Studio 2008 with C#

  - by Napoli

  I need to install the ExcelPackage library on Visual Studio 2008. The .zip file I downloaded from their website (http://excelpackage.codeplex.com) contains a .dll, a .xml file, a "GacReg.exe" and a file called ExcelPackage (with this description: "Program Debug Database"). What are the steps to installing this library, or any library in general? I appreciate the help.

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• Thinking-sphinx and relevance or similarity score

  - by Sohan

  Does someone know if there is a way to get the raw relevance or similarity score between a query and a result when using sphinx in general or thinking-sphinx as a wrapper? Any help is greatly appreciated.

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• Is it bad to explicitly compare against boolean constants?

  - by polygenelubricants

  Is it bad to write: if (b == false) //... while (b != true) //... Is it always better to instead write if (!b) //... while (!b) //... Presumably there is no difference in performance (or is there?), but how do you weigh the explicitness, the conciseness, the clarity, the readability, etc between the two?

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• Git for Local Branches

  - by Rachel

  How can I differentiate between two local branches in git ? How can I copy one local branch to another local branch ? In general how can I perform difference operation between two local branches on my server using git. I tried looking it up online but there is not enough documentation on that or there is not clear documentation on that. Any suggestions or links to useful material would be highly appreciated. Thanks.

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• OpenMP implementations in VC++ 2008, 2010

  - by John

  Depending on implementation, OMP can be quite useful to parallelize fairly arbitrary bits of code - e.g a parallel section inside a method that calls two independent methods - or it can be bad. It depends on how threads are created/cached, I think. How does the VC++ 2008 implementation work? And is the 2010 implementation significantly different in terms of features and performance/flexibility?

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• What is the equivalent of REGEXP_SUBSTR in mysql?

  - by KandadaBoggu

  I want to extract a word from a string column of a table. description =========================== abc order_id: 2 xxxx yyy aa mmm order_id: 3 nn kk yw Expected result set order_id =========================== 2 3 Table will at most have 100 rows, text length is ~256 char and column always has one order_id present. So performance is not an issue. In Oracle, I can use REGEXP_SUBSTR for this problem. How would I solve this in MySQL?

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• Does generation of debug information to JSP classes add much to javac execution time?

  - by Rich

  Hi I am looking looking into the options for tweaking the performance of JBoss 5.1.0 and one of the options available to me is to disable the generation of debug information when compiling JSPs. I know that the presence/absence of debug information for the JVM makes no real difference, but does the generation of that debug information add much to compile time? Thanks in advance Richard

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• Unicode Regex; Invalid XML characters

  - by Ambush Commander

  The list of valid XML characters is well known, as defined by the spec it's: #x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD] | [#x10000-#x10FFFF] My question is whether or not it's possible to make a PCRE regular expression for this (or its inverse) without actually hard-coding the codepoints, by using Unicode general categories. An inverse might be something like [\p{Cc}\p{Cs}\p{Cn}], except that improperly covers linefeeds and tabs and misses some other invalid characters.

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• Are there any .net classes/functions that are optimized for multiple cores?

  - by diamandiev

  I know that the developer is supposed to do this himself. But seeing how we are getting cpu's with more and more cores and there are still many developers who do not use multithreading, if we have this functionality built in, it could increase performance dramatically in some scenarios. One particular example where this could be quite useful is in image processing. I doubt that the built in GDI+ classes are multithreaded.

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• Will HTML5 support the access of offline cached audio?

  - by milesmeow

  We want to make an audio based web based app that will have many sound snippets. We want to cache these files so that performance is good and not dependent on network speed. Can HTML5 cache audio for offline mode?

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• Is ImageX needed after Sysprep when preparing a Virtual PC for copying?

  - by Toddintr

  I have researched this question and there seems to be two methods: 1) Run Sysprep, and 2) Run Sysprep followed by ImageX (this is what Microsoft says should be done). What does ImageX do and any pointers on the general process to follow? Thanks, -Todd

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• compare windows server for patch/update/hotfix installs

  - by user12002221

  Are there any tools that can be used to connect to windows 2008 servers, and get a comparison of the installed patches/updates on the servers, showing what is installed on one and not on the other? This is to help isolate an issue we are seeing on a specific windows server, in a load balanced setup. There is a certain performance/locking issue, which is mitigated whenever one of the servers is disabled. Please share, if you have any suggestions. Thanks in advance!

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• C# Check for missing number in sequence

  - by Jon

  I have an List<int> which contains 1,2,4,7,9 for example. I have a range from 0 to 10. Is there a way to determine what numbers are missing in that sequence? I thought LINQ might provide an option but I can't see one In the real world my List could contain 100,000 items so performance is key

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• Octave / Matlab: Extend a vector making it repeat itself?

  - by Tom

  Hi everyone, Is there a way to extend a vector by making it repeat itself? >v = [1 2]; >v10 = v x 5; %x represents some function. Something like "1 2" x 5 in perl Then v10 would be: >v10 1 2 1 2 1 2 1 2 1 2 This should work for the general case, not just for [1 2] Thanks in advance !

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• cannot assign <null> to implicit types local variable using asp.net

  - by rockers

  I have this var result = general.GetInformation(int.Parse(ID), F_account, F_Info, Types); this GetInformation is my Entity.Getinformation class.. when I am trying to assign result globly I am getting Cannot Assign to implicit typed local variable? var result = ? what should I assign in global? thanks

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• When should we delete the cache data in an iPhone apps?

  - by athanhcong

  Hi all, We often cache image and data to improve our iPhone app's performance. But what strategy do you use to manage the cache data, such as delete or update it? When should we trigger to delete the cache data: when the iPhone apps starts, or quits, or in idle time?

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• What are the benefits of using IronPython over IronRuby or F#?

  - by Aim Kai

  Well aware that DLR is here!! I have recently reading up on all of these and was wondering if there were any specific benefits of using one language over another? For example performance benefits! and available functionality through standard libaries!!

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• Java2D: Capturing an event on a Line object

  - by Algorist

  I have a JPanel which has a line, circle etc..Now when I click on the line, will the event get reported as a line event or a general jframe event. I need to be able to move the line, if the user clicks on the line and moves it. Is this possible in Java2d. Thank you.

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• Windows must have utilities [closed]

  - by Marcus

  What are your must have Windows utilities to help you with development? For me it's Unlocker This is about general Windows utilities, nothing specific to any language.

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• I'm trying to ressurrect UnderC C/C++ interpreter [closed]

  - by Domingo

  Hello ! I'm trying to ressurrect UnderC C/C++ interpreter https://code.google.com/p/underc-fltk/ and I got it to compile with modern mingw compilers 3.4.5 and up, I need some experts advice on some topics: -Yacc/Bison grammar (example some problems with recognizing "unsigned" alone and "friend class") -ARM assembler only one function to call native os functions (X86 already there for windows and linux) -General improvements I expect it to work on WINCE, IPHONE, SYMBIAN in the near future. Thanks in advance for your expertize, time and attention !

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• Best free, online Python tutorials and references for an experienced programmer?

  - by Jacques Bosch

  I have been doing Java, and C# for many years. Starting on my first big Python program now. I have written a few, very small, text processing scripts in Python years ago. I would like to know what is the best, free, online Python tutorial for experienced programmers. Python in general, but then also web programming with Python. Will be using Django. Thanx much.

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