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  • Generics and Constrained Polymorphism versus Subtyping

    - by Rahul G
    Hullo all. In this (Warning: PDF) presentation on Haskell Type Classes, on slide #54, there's this question: Open Question: In a language with generics and constrained polymorphism, do you need subtyping too? My questions are: How do generics and constrained polymorphism make subtyping unnecessary? If generics and constrained polymorphism make subtyping unnecessary, why does Scala have subtyping?

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  • Multithreaded Haskell

    - by Ingdas
    Hi I'm learning Haskell and I'd like to write some multithreaded programs now to see the performance gains from that in a functional language. I can find some references to it on the internet but never a proper introduction to it. Can anyone point me to a guide which is understandable for someone who knows the syntax fairly well, but is not a wizard in Haskell?

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  • how to use quad core CPU in application

    - by Mayank
    For using all the cores of a quad core processor what do I need to change in my code is it about adding support of multi threading or is it which is taken care by OS itself. I am having FreeBSD and language I am using is C++. I want to give complete CPU cycles to my application at least 90%.

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  • Automatic translation from fortran 90 to f77

    - by osgx
    Hello Is there an converter from fortran 90 downto fortran 77 ? I have a fortran77 only compiler and want to run NAS Parallel Benchmark (NPB for short) on it. But NPB uses some features of F90, like do enddo, smth else. All features are rather simple. Is there A way to translate NPB to F77 strict language? Tags: fortran parallel convert programming-languages

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  • When to address managed heap fragmentation

    - by emddudley
    I was reading a blog entry by Josh Smith where he used a cache mechanism in order to "reduce managed heap fragmentation". His caching reduces the number of short-lived objects being created at the cost of slightly slower execution speed. How much of a problem is managed heap fragmentation in a managed language like C#? How can you diagnose if it's an issue? In what situations would you typically need to address it?

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  • GCD function in matlab

    - by SalemFayad
    hi, i am looking for a way to implement the "gcd" function used in matlab in another language but i really cant understand the way it functions. it says in http://www.mathworks.com/access/helpdesk/help/techdoc/ref/gcd.html that: "[G,C,D] = gcd(A,B) returns both the greatest common divisor array G, and the arrays C and D, which satisfy the equation: A(i).*C(i) + B(i).*D(i) = G(i)." but it says nothing about how it calculates C and D. i would be grateful if someone has a clearer idea about this subject! thanks:)

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  • How can ported code be detected?

    - by NiallJG
    If you port code over from one language to another, how can this be detected? Say you were porting code from c++ to Java, how could you tell? What would be the difference between a program designed and implemented in Java, and a near identical program ported over to Java?

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  • Software Engineering Papers

    - by kunjaan
    Please recommend me software engineering/methodology/practices paper. So far I have enjoyed: 1968 Dijkstra : Go To Statement Considered Harmful Nikalus Wirth : Program Development by Stepwise Refinement 1971 David Parnas : Information Distribution Aspects of Design Methodology 1972 Liskov : Design Methodology for Reliable Software Systems Extensible Language : Schuman and P Jourrand R. Balzer Structured Programming : Dahl - Hierarchical Program StructuresImplementation Patterns 1971 Jim Morris Protection in Programming Languages 1973 Bill Wulf and Mary Shaw Global Variable Considered Harmful 1974 : Lisko and Zilles ADTs

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  • Deserializing classes from XML generated using XSD.exe

    - by heap
    I have classes generated (using xsd.exe) from an .xsd that I can serialize just fine, but when I try and deserialize it, I get the error: {"<XMLLanguages xmlns='http://tempuri.org/XMLLanguages.xsd'> was not expected."} I've searched for a couple of hours and found most peoples problems lie in not declaring namespaces in their xsd/xml, not defining namespaces in their classes, etc, but I can't find a solution for my problem. Here are code snippets for the relevant classes. <?xml version="1.0" encoding="utf-8"?> <xs:schema id="SetupData" targetNamespace="http://tempuri.org/XMLLanguages.xsd" elementFormDefault="qualified" xmlns="http://tempuri.org/XMLLanguages.xsd" xmlns:xs="http://www.w3.org/2001/XMLSchema" > <xs:element name="XMLLanguages"> <xs:complexType> <xs:sequence> <xs:element name="Tier" minOccurs="1" maxOccurs="unbounded"> <xs:complexType> <xs:sequence> <xs:element name="L" minOccurs="1" maxOccurs="unbounded" type="Language"/> </xs:sequence> <xs:attribute name="TierID" type="xs:int"/> </xs:complexType> </xs:element> </xs:sequence> </xs:complexType> </xs:element> <xs:complexType name="Language"> <xs:sequence> <xs:element name="LangID" type="xs:int"/> <xs:element name="Tier" type="xs:int"/> <xs:element name ="Name" type="xs:string"/> </xs:sequence> <xs:attribute name ="PassRate" type="xs:int"/> </xs:complexType> </xs:schema> And the class: /// <remarks/> [System.CodeDom.Compiler.GeneratedCodeAttribute("xsd", "4.0.30319.1")] [System.SerializableAttribute()] [System.Diagnostics.DebuggerStepThroughAttribute()] [System.ComponentModel.DesignerCategoryAttribute("code")] [System.Xml.Serialization.XmlTypeAttribute(Namespace = "http://tempuri.org/XMLLanguages.xsd")] [System.Xml.Serialization.XmlRootAttribute(Namespace = "http://tempuri.org/XMLLanguages.xsd", IsNullable = false)] public partial class XMLLanguages { private List<XMLLanguagesTier> tierField; /// <remarks/> [System.Xml.Serialization.XmlElementAttribute("Tier")] public List<XMLLanguagesTier> Tiers { get { return this.tierField; } set { this.tierField = value; } } } And a the line in XML causing the error: <XMLLanguages xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://tempuri.org/XMLLanguages.xsd">

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  • Enable PostBack for a ASP.NET User Control

    - by Steven
    When I click my "Query" the values for my user controls are reset. How do I enable PostBack for my user control? myDatePicker.ascx <%@ Control Language="vb" CodeBehind="myDatePicker.ascx.vb" Inherits="Website.myDate" AutoEventWireup="false" %> <%@ Register assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" tagprefix="asp" %> <asp:TextBox ID="DateTxt" runat="server" ReadOnly="True" /> <asp:Image ID="DateImg" runat="server" ImageUrl="~/Calendar_scheduleHS.png" EnableViewState="True" EnableTheming="True" /> <asp:CalendarExtender ID="DateTxt_CalendarExtender" runat="server" Enabled="True" TargetControlID="DateTxt" PopupButtonID="DateImg" DefaultView="Days" Format="ddd MMM dd, yyyy" EnableViewState="True"/> myDatePicker.ascx Partial Public Class myDate Inherits System.Web.UI.UserControl Public Property SelectedDate() As Date? Get Dim o As Object = ViewState("SelectedDate") If o = Nothing Then Return Nothing End If Return Date.Parse(o) End Get Set(ByVal value As Date?) ViewState("SelectedDate") = value End Set End Property End Class Default.aspx <%@ Page Language="vb" AutoEventWireup="false" CodeBehind="Default.aspx.vb" Inherits="Website._Default" EnableEventValidation="false" EnableViewState="true" %> <%@ Register TagPrefix="my" TagName="DatePicker" Src="~/myDatePicker.ascx" %> <%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajax" %> <%@ Register Assembly="..." Namespace="System.Web.UI.WebControls" TagPrefix="asp" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> ... <body> <form id="form1" runat="server"> <div class="mainbox"> <div class="query"> Start Date<br /> <my:DatePicker ID="StartDate" runat="server" EnableViewState="True" /> End Date <br /> <my:DatePicker ID="EndDate" runat="server" EnableViewState="True" /> ... <div class="query_buttons"> <asp:Button ID="Button1" runat="server" Text="Query" /> </div> </div> <asp:GridView ID="GridView1" ... > </form> </body> </html> Default.aspx.vb Imports System.Web.Services Imports System.Web.Script.Services Imports AjaxControlToolkit Protected Sub Page_Load(ByVal sender As Object, _ ByVal e As EventArgs) Handles Me.Load End Sub Partial Public Class _Default Inherits System.Web.UI.Page Protected Sub Button1_Click(ByVal sender As Object, _ ByVal e As EventArgs) Handles Button1.Click GridView1.DataBind() End Sub End Class

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  • 'javadoc' look-a-like, using parser generator?

    - by wvd
    Hello all, I'm going to create a javadoc look-a-like for the language I'm mainly using, but I was wondering - is it worth to use a parser generator for this? The main idea to use a parser generator was because I could use templates for the HTML code which could be exported then. Also I could also use PDF templates if I need it. Thanks, William v. Doorn

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  • Can I write for .Net 4 using VS2008?

    - by chillitom
    Can I write code against .Net 4 and its libraries using VS2008? If so how should I configure it? I realise that VS2008 will probably struggle with language changes such as the dynamic keyword but can I install the version 4 and target it anyway? My only real interest is in being able to use some of the new libraries, in particular I'm interested in the TPL (http://en.wikipedia.org/wiki/Parallel_Extensions)

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  • what is the difference between declarative and imperative programming

    - by Brad
    I have been searching the web looking for a definition for declarative and imperative programming that would shed some light for me. However the language used at some of the resources that I have found is daunting - for instance at wikipedia. Does any one have a real world example that they could show me that might bring some perspective to this subject...perhaps in c# thanks

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  • Why does using ASP.NET OutputCache keep returning a 200 OK, not a 304 Not Modified?

    - by Pure.Krome
    Hi folks, i have a simple aspx page. Here's the top of it:- <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Foo.aspx.cs" Inherits="Foo" %> <%@ OutputCache Duration="3600" VaryByParam="none" Location="Any" %> Now, every time I hit the page in FireFox (either hit F5 or hit enter in the url bar) I keep getting a 200 OK response. Here's a sample reply from FireBug :- Request Headers:- GET /sitemap.xml HTTP/1.1 Host: localhost.foo.com.au User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-GB; rv:1.9.2) Gecko/20100115 Firefox/3.6 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-au,en-gb;q=0.7,en;q=0.3 Accept-Encoding: gzip,deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive: 115 Connection: keep-alive Cookie: <snipped> If-Modified-Since: Tue, 01 Jun 2010 07:35:17 GMT If-None-Match: "" Cache-Control: max-age=0 Response Headers:- HTTP/1.1 200 OK Cache-Control: public Content-Type: text/xml; charset=utf-8 Expires: Tue, 01 Jun 2010 08:35:17 GMT Last-Modified: Tue, 01 Jun 2010 07:35:17 GMT Etag: "" Server: Microsoft-IIS/7.5 X-Powered-By: UrlRewriter.NET 2.0.0 X-AspNet-Version: 4.0.30319 Date: Tue, 01 Jun 2010 07:35:20 GMT Content-Length: 775 Firebug Cache tab:- Last Modified Tue Jun 01 2010 17:35:20 GMT+1000 (AUS Eastern Standard Time) Last Fetched Tue Jun 01 2010 17:35:20 GMT+1000 (AUS Eastern Standard Time) Expires Tue Jun 01 2010 18:35:17 GMT+1000 (AUS Eastern Standard Time) Data Size 775 Fetch Count 105 Device disk Now, if i try it in Fiddler using the Request Builder (and no extra data) I also keep getting the same 200 OK reply. Request Headers:- GET http://localhost.foo.com.au/sitemap.xml HTTP/1.1 User-Agent: Fiddler Host: foo.com.au Response Headers:- HTTP/1.1 200 OK Cache-Control: public Content-Type: text/xml; charset=utf-8 Expires: Tue, 01 Jun 2010 07:58:00 GMT Last-Modified: Tue, 01 Jun 2010 06:58:00 GMT ETag: "" Server: Microsoft-IIS/7.5 X-Powered-By: UrlRewriter.NET 2.0.0 X-AspNet-Version: 4.0.30319 Date: Tue, 01 Jun 2010 06:59:16 GMT Content-Length: 775 It looks like it's asking to cache it but it's not :( Server is a localhost IIS7.5 on Win7. (as listed in the Response data). Can anyone see what I'm doing wrong?

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  • How to load photoshop action with JavaScript?

    - by Elena
    Hello! How do I load photoshop's action using its javascript scripting language? Mostly curious in this action steps: Add Noise Distribution: gaussian Percent: 2% With Monochromatic Texturizer Texture Type: Canvas Scaling: 100 Relief: 3 Without Invert Texture Light Direction: Top Left

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  • Screen-scraping a site with a asp.net form login in C#?

    - by Ajit
    Hi Friends, i've created a web application in asp.net so far. where i've tried to get some data(site scraping) from secure page of a web site.I've used the HttpWebRequest class for this functionality but i haven't accessed the secure page yet. Every time the login pages was scraped not secure page.I have the site user id and password and don't know that which language site has been developed in. Please advice what should i do ?

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  • Is there any working implementation of reverse mode automatic differentiation for Haskell?

    - by Ian Fiske
    The closest-related implementation in Haskell I have seen is the forward mode at http://hackage.haskell.org/packages/archive/fad/1.0/doc/html/Numeric-FAD.html. The closest related related research appears to be reverse mode for another functional language related to Scheme at http://www.bcl.hamilton.ie/~qobi/stalingrad/. I see reverse mode in Haskell as kind of a holy grail for a lot of tasks, with the hopes that it could use Haskell's nested data parallelism to gain a nice speedup in heavy numerical optimization.

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  • What container is eaziest for combining Jpegs and MP3s as video?

    - by Ole Jak
    So I have N (for example 1000) Jpeg frames and 10*N ( for ex 100) seconds of MP3 sound I need some conteiner for Joining them into one Video file (10 frames/second) (beter popular like FLV or AVI or MOV). So what I need is algorithm or code example of combining my data into some popular format. (code example beter be in some language like C# Java or ActionScript or PHP, Algorithm should be theoreticly Implementable with ActionScript or PHP) Can any one, please help me with that?)

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  • Komodo Double Indentation with Tab

    - by T. Stone
    In Komodo Edit, if I name the file *.django.html it gives me django syntax highlighting BUT it also indents with a tab character (8 spaces) instead of giving me the usual 4 space indent. How can I fix this? I've tried changing the value in Edit Preferences Editor Indentation Language Settings, but that seems to have no effect on it. The indentation works as normal (4 spaces) if I'm using any other extension (.py, .html, etc.). Ideas?

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