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• Generic Data Structure Description Language

  - by Jon Purdy

  I am wondering whether there exists any declarative language for arbitrarily describing the format and semantics of a data structure, that can be compiled to a specific implementation of that structure in any of a set of target languages. That is, something like a generic data definition language but geared toward describing arbitrary data structures such as vectors, lists, trees, etc., and the semantics of operations on those structures. I ask because I had an idea for a feasible implementation of this concept, and I'm just wondering whether it's worth it, and, consequently, whether it's been done before. Another, slightly more abstract question: is there any real difference between the normative specification of a data structure (what it does) and its implementation (how it does it)?

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• Is there a calculator with LaTeX-syntax?

  - by Jørgen Fogh

  When I write math in LaTeX I often need to perform simple arithmetic on numbers in my LaTeX source, like 515.1544 + 454 = ???. I usually copy-paste the LaTeX code into Google to get the result, but I still have to manually change the syntax, e.g. \frac{154,7}{25} - (289 - \frac{1337}{42}) must be changed to 154,7/25 - (289 - 1337/42) It seems trivial to write a program to do this for the most commonly used operations. Is there a calculator which understand this syntax? EDIT: I know that doing this perfectly is impossible (because of the halting problem). Doing it for the simple cases I need is trivial. \frac, \cdot, \sqrt and a few other tags would do the trick. The program could just return an error for cases it does not understand.

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• Setting session timezone with spring jdbc oracle

  - by user337620

  Hello I have a spring/jdbc/oracle 10g application. The Oracle server database timezone is set to GMT + 2 JVM timezone is GMT + 2 (even though it doesn't matter in my case). I have a stored procedure that performs some date operations. The problem is that session timezone is different(GMT) than database timezone even though I do not set session timezone explicit in my code/configuration. As far as I know the session timezone is by default equal to database timezone. Any idea why is the session timezone different than database timezone or how can I configure it in spring configuration (org.apache.commons.dbcp.BasicDataSource) ? Thank you.

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• Sitemaps on multiple front end servers using a http handler, is that a good idea?

  - by Rihan Meij

  Question 1 We would like to generate a site map for our CMS site We have multiple front end servers with approx a million articles. Environment multiple MS SQL servers multiple front end servers (load balanced) ASP.net - and IIS 6 Windows 2003 To have the site maps (the site map index file, and the site map files) physically on the front end servers will be a operations nightmare and error prone. So we are considering using http handlers instead so that it does not matter what server gets the request, it will be able to serve the correct xml file. Question 2 If we ping Google each time we publish a new article will that effect us negatively if that happens more than once a hour. Thanks!

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• which is best algorithm?

  - by Lopa

  Consider two algorithms A and B which solve the same problem, and have time complexities (in terms of the number of elementary operations they perform) given respectively by a(n) = 9n+6 b(n) = 2(n^2)+1 (i) Which algorithm is the best asymptotically? (ii) Which is the best for small input sizes n, and for what values of n is this the case? (You may assume where necessary that n0.) i think its 9n+6. guys could you please help me with whether its right or wrong?? and whats the answer for part b. what exactly do they want?

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• Computational geometry: find where the triangle is after rotation, translation or reflection on a mi

  - by newba

  I have a small contest problem in which is given a set of points, in 2D, that form a triangle. This triangle may be subject to an arbitrary rotation, may be subject to an arbitrary translation (both in the 2D plane) and may be subject to a reflection on a mirror, but its dimensions were kept unchanged. Then, they give me a set of points in the plane, and I have to find 3 points that form my triangle after one or more of those geometric operations. Example: 5 15 8 5 20 10 6 5 17 5 20 20 5 10 5 15 20 15 10 I bet that have to apply some known algorithm, but I don't know which. The most common are: convex hull, sweep plane, triangulation, etc. Can someone give a tip? I don't need the code, only a push, please!

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• SSRS 2005 - Usability analysis - Is SSRS a good option for this scenario?

  - by Sach

  How practical is it to consider SSRS 2005 or SSRS 2008 as a reporting solution for a report that has to show reports with millions of records (records vary from 3 to 10 million)? Is there any threshold on the size of report in SSRS? How do I know that for a huge report, wheather SSRS will consume the whole memory and start paging the operations to disk or it will give a memory leak error? Even if I keep on increasing the memory how can I be sure that certain memory will be sufficient for such huge reports for the report server? All the above questions are haunting me because I have a dedicated report server with a decent hardware and OS configuration (8 processors, 8GB RAM, 64 bit OS and 64 bit SQL Server 2005). Still my report with around 2 million records is taking more than 6 minutes and going from one page to another takes 3 minutes!!! My datasource is on separate server and when I execute only the stored proc there, it returns the results in less than 2 minutes.

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• Implementing a pager for asp.net's DataList/Repeater

  - by emre

  I have a DataList showing the results, and a Repeater that is supposed to be the pager. I decided to use the page number by redirecting with a QueryString parameter, so it will also be bookmarkable ... My problem is mainly in the UI actually. If I put DIV's with their onclick calling a JS function that does window.location = url + pagenumber , then somehow I have to deal with QueryString operations via JS which is a bit messy. If I use LinkButton objects within the ItemTemplate, then the Redirecting happens only when the linkbutton is clicked while whole div has cursor: pointer , you what I mean. What would be the best approach to this? Thanks in advance. Note: I really want to spend the time and effort implementing my own server-side paging. I think its more fun than reading 3rd party manuals.

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• SPGridView current item in Sharepoint

  - by pistacchio

  Hi, I'm making a custom webpart. I takes some items from a list and display them with a SPGridView. I bound the fields like this: // Grab data from a SP List into dvwTickets SPGridView grdMyTickets = new SPGridView(); grdMyTickets.DataSource = dvwTickets; [..] BoundField colTicketTypology = new BoundField(); colTicketTypology.DataField = "ID"; colTicketTypology.HeaderText = ticketList.Fields.GetFieldByInternalName("ID").Title; grdMyTickets.Columns.Add(colTicketTypology); [..] This works. Now, what a grid does behind the scene when binding data to it is cycling through the binded data. How can I access the "Current Item" to make operations on each item while binding? Thanks

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• Transactions not working for SubSonic under Oracle?

  - by Fervelas

  The following code sample works perfectly under SQL Server 2005: using (TransactionScope ts = new TransactionScope()) { using (SharedDbConnectionScope scope = new SharedDbConnectionScope()) { MyTable t = new MyTable(); t.Name = "Test"; t.Comments = "Comments 123"; t.Save(); ts.Complete(); } } But under Oracle 10g it throws a "ORA-02089: COMMIT is not allowed in a subordinate session" error. If I only execute the code inside the SharedDbConnectionScope block then everything works OK, but obviously I won't be able to execute operations under a transaction, thus risking data corruption. This is only a small sample of what my real application does. I'm not sure as to what may be causing this behavior; anyone out there care to shed some light on this issue please? Many thanks in advance.

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• Visual Studio Database Professional GDR R2 takes a long time to serialize DBMDL file

  - by Nicolas Webb

  The amount of time it takes to completely serialize the DBMDL (to finish "Your project will be available after 10000 operations are completed) is becoming a hindrance to productivity. I've done what I can to optimize disk activity (excluding my personal TEMP folder from the virus scanner, along with my local source repository). Short of getting a SSD I'm not sure what else I can do along those lines. I believe it has something to do with how the project is organized. The finished DBMDL file is roughly 150MB. Others throughout our organization do not seem to have this issue. Anyone had to deal with this?

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• WCF Self-hosted service, client clean-up on service stop

  - by Sentax

  Hi everyone, I'm curious to know how I would go about setting up my service to stop cleanly on the server the service will be installed on. For example when I have many clients connecting and doing operations every minute and I want to shut-down the service for maintenance, how can I do this in the "OnStop" event of the service to then let the main service host to deny any new client connections and let the current connections finish before it actually shuts down its services to the client, this will ensure data isn't corrupted on the server as the server shuts down. Right now I'm not setup as a singleton because I need scalability in the service. So I would have to somehow get my service host to do this independently of knowing how many instances are created of the service class. I hope I explain myself good enough, if not, let me know, I'll try to explain better. Thanks, Scott

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• Is generic Money<T_amount> a good idea?

  - by jdk

  I have a Money Type that allows math operations and is sensitive to exchange rates so it will reduce one currency to another if rate is available to calculate in a given currency, rounds by various methods. It has other features that are sensitive to money, but I need to ask if the basic data type used should be made generic in nature. I've realized that the basic data type to hold an amount may differ for financial situations, for example: retail money might be expressed as all cents using int or long where fractions of cents do not matter, decimal is commonly used for its fixed behaviour, sometimes double seems to be used for big finance and large values sometimes a special BigInteger or 3rd-party type is used. I want to know if it would be considered good form to turn Money into Money<T_amount> so it can be used in any one of the above chosen scenarios?

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• What sense does asynchronous IO make if the thread is blocked anyway (see example)

  - by codymanix

  Hello, I found an example for async ftp upload on msdn which does the following (snippet): // Asynchronously get the stream for the file contents. request.BeginGetRequestStream( new AsyncCallback (EndGetStreamCallback), state ); // Block the current thread until all operations are complete. waitObject.WaitOne(); The thing what I do not understand here is, which sense does asynchronous IO make if the thread is blocked anyway with an explicit waithandle. I always thought the advantage of asynchronous IO was that the user/programm does not have to wait.

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• Optimize SQL databases by adding index columns

  - by Viktor Sehr

  This might be implementation specific so the question regards how SQL databases is generally implemented. Say I have a database looking like this; Product with columns [ProductName] [Price] [Misc] [Etc] Order with columns [OrderID] [ProductName] [Quantity] [Misc] [Etc] ProductName is primary key of Product, of some string type and unique. OrderID is primary key and of some integer type, and ProductName being a foreign key. Say I change the primary key of Product to a new column of integer type ie [ProductID] Would this reduce the database size and optimize lookups joining these two tables (and likewise operations), or are these optimizations performed automatically by (most/general/main) SQL database implementations?

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• Passing object from PHP to Mysql Stored procedure

  - by user268982

  Hi All, Scenario :- I have to call MYSQL stored procedure from PHP and do some operations ( around 15 commands ) on the database Problem :- I have to call stored procedure with 36 parameters. Lot of parameters . I don't think it is a good idea to pass these many individual parameters and even heard passing individul parameters increases network traffic. Looking for :- I created a Data Object at PHP side and is there any way I can create similar kind of Object in MYSQL and pass this object as a parameter and extract the data from the object in MYSQL stored procedure Thanks for your help Regards Kiran

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• Perl/Tk : Giving alert to the user

  - by kiruthika

  Hi all, I am learning Perl/Tk. I want to give alert to the user whenever he/she receives the mail. I have planned to use message box in Tk,but it is expecting the user to click ok or cancel button. Until user clicked the any one button it wont do any further operations. But I want ,it just needs to give alert to the user and user can continue with the further process. Please help me.. Thanks in advance.

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• Building Visual studio like application, need inputs..

  - by akjoshi

  Hi, I am working on a Visual studio like application i.e. hava a tolbox, an editor and property grid similar to VS. ser can drag and drop the controls(custom and third party) to the editor window and perform operations like resize, move, align, group etc.; Properties of that control needs to be displayed in property grid and user can update them from there. As per my current understanding I will have to extend the Canvas to create my own editor and and Interface for controls which it supports; Each supported control will have to implemnt this interface so that it can be placed in our editor. Something similar to this - http://www.codeproject.com/KB/WPF/WPFDiagramDesigner_Part4.aspx Looking forward for any kind of help, comment or links.

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• Set Theory and .NET

  - by MasterMax1313

  Recently I came across a situation where set theory and set math fit what I was doing to the letter (granted there was an easier way to accomplish what I needed - i.e. LINQ - but I didn't think of that at the time). However I didn't know of any generic set libraries. Granted IEnumerables provide some set operations (Union, etc.), but nothing like Intersection or set comparison. Can anyone point out something that fits here? Something that implements set math using a generic type?

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• Using Static methods or none static methods in Dao Class ?

  - by dankyy1

  Hi I generate Dao classes for some DB operations in this manner making methods of Dao class as static or none static is better? Using sample dao class below ,If more than one client got to use the AddSampleItem method in same time?how this may result? public class SampleDao { static DataAcessor dataAcessor public static void AddSampleItem(object[] params) { dataAcessor =new DataAcessor(); //generate query here string query="..." dataAcessor.ExecuteQery(query); dataAcessor.Close(); } public static void UpdateSampleItem(object[] params) { dataAcessor =new DataAcessor(); //generate query here string query="..." dataAcessor.ExecuteQery(query); dataAcessor.Close(); } }

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• Selective PHP autoload

  - by Extrakun

  I am writing a add-on module which is integrated with an existing PHP application; Because I am using a MVC pattern, and which may requires lot of inclusion of classes (which might not be used at all depending on the action of the user), I decide to use autoloading of classes. However, I have to ensure that the autoload function does not interferes with the normal operations of the existing applications. Does autoload only kicks in if a class name is not defined? Say I have to write another module which uses its own autoload functions (say, I have an autoload for a module, since they each reside in their own folder), how do I differentiate which module is it for? For #2, I thought of 2 options. Either prefix the class name with the module name (Such as 'MyNewModule_View_Default' and 'AnotherModule_View_Default'), or use file_exists to check the include file exists. Other suggestions are welcomed too!

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• Matrix inversion in OpenCL

  - by buchtak

  Hi, I am trying to accelerate some computations using OpenCL and part of the algorithm consists of inverting a matrix. Is there any open-source library or freely available code to compute lu factorization (lapack dgetrf and dgetri) of matrix or general inversion written in OpenCL or CUDA? The matrix is real and square but doesn't have any other special properties besides that. So far, I've managed to find only basic blas matrix-vector operations implementations on gpu. The matrix is rather small, only about 60-100 rows and cols, so it could be computed faster on cpu, but it's used kinda in the middle of the algorithm, so I would have to transfer it to host, calculate the inverse, and then transfer the result back on the device where it's then used in much larger computations.

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• SubSonic-based app that connects to multiple databases

  - by Fervelas

  Hello there, I currently developed an app that connects to SQL Server 2005 database, so my DAL objects where generated using information from that DB. It will also be possible to connect to an Oracle and MySQL db, all with the same table structures (aside from the normal differences in fields, such as varbinary(max) in SQL Server and BLOB in Oracle, and so on). For this purpose, I already defined multiple connection strings and multiple SubSonic providers for the different DB's the app will run on. My question is, if I generated my objects using a SQL Server database, should the generated objects work transparently with the other DB's or do I need to generate a different DAL for each database engine I use? Should I be aware of any possible bugs I may encounter while performing these operations? Thanks in advance for any advice on this issue.

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• How to implement a graph-structured stack?

  - by Emil

  Ok, so I would like to make a GLR parser generator. I know there exist such programs better than what I will probably make, but I am doing this for fun/learning so that's not important. I have been reading about GLR parsing and I think I have a decent high level understanding of it now. But now it's time to get down to business. The graph-structured stack (GSS) is the key data structure for use in GLR parsers. Conceptually I know how GSS works, but none of the sources I looked at so far explain how to implement GSS. I don't even have an authoritative list of operations to support. Can someone point me to some good sample code/tutorial for GSS? Google didn't help so far. I hope this question is not too vague.

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• Why is FxCop warning about an overflow (CA2233) in this C# code?

  - by matt

  I have the following function to get an int from a high-byte and a low-byte: public static int FromBytes(byte high, byte low) { return high * (byte.MaxValue + 1) + low; } When I analyze the assembly with FxCop, I get the following critical warning: CA2233: OperationsShouldNotOverflow Arithmetic operations should not be done without first validating the operands to prevent overflow. I can't see how this could possibly overflow, so I am just assuming FxCop is being overzealous. Am I missing something? And what steps could be taken to correct what I have (or at least make the FxCop warning go away!)?

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