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  • initial conditions in coupled systems

    - by Alireza
    how should i write the initial conditions and solve two coupled differential equation? for ex. like: s1 := diff(n[D](t), t) = a-b*n[D](t)^2-c*n[D](t)-e*n[D](t)*n[T](t) s2 := diff(n[T](t), t) = b*n[D](t)^2-c*n[D](t)-e*n[D](t)*n[T](t) dsolve({s1, s2});

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  • bind 2 exe into one

    - by Oghenero
    Hello, i want to bind two exe files into one exe file, and when executed it should only create 1 process. For example you can try to bind windows calc.exe and notepad.exe to binded.exe and when executed it should just see binded.exe in process list and both calc.exe and notepad.exe should start.

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  • References between ASP.NET web applications.

    - by mcoolbeth
    I have a Visual Studio solution containing two web applications. I would like the first to depend on the second (pages in the first may contain links to, or possibly post to pages in the second). Furthermore, I would like to be able to launch the first project on a development server (standard debugging procedure for web apps in VS) and have the references to the second project be fully functional. Does anyone know the best way to achieve this? Thanks.

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  • Export list as .txt (Python)

    - by Nimbuz
    My Python module has a list that contains all the data I want to save as a .txt file somewhere. The list contains several tuples like so: list = [ ('one', 'two', 'three'), ('four', 'five', 'six')] How do I print the list so each tuple item is separated by a tab and each tuple is separated by a newline? Thanks

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  • How to generate custom JSESSIONID, based on some hash of user's data in order to replicate session

    - by Shaman
    Is it possible to override Tomcat's embedded generator of JSESSIONID, to be able to create custom values of this cookie, based on user's login? Why do I need this: I have a load balancer with "sticky sessions", configured to route requests with the same JSESSIONID to the same server, and I want to prevent situation, when same user can start two different sessions on different servers.

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  • How automatically fill a form with jQuery ?

    - by Shady
    Hi, I have a website that changes his inputs ids, and I'm trying to make a semi auto-login, filling automatically the email and the password part... I'm doing this with greasemonkey and jQuery... I'm trying something like this $("input[@type=text]").setValue("[email protected]"); but had no success... The Page has only the login part, two text type inputs... What am I missing here?

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  • Clojure best way to achieve multiple threads?

    - by user286702
    Hello! I am working on a MUD client written in Clojure. Right now, I need two different threads. One which receives input from the user and sends it out to the MUD (via a simple Socket), and one that reads and displays output from the MUD, to the user. Should I just use Java Threads, or is there some Clojure-specific feature I should be turning to?

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  • MVC2 Clientside Validation and duplicate ID's problem

    - by Dusty Roberts
    I'm using MVC2 with VS2010 I have a view that has two partial views in it: "Login" and "Register" both partial views contains the Email address field i use the following in both partial views: <%: Html.TextBoxFor(model => model.EmailAddress ) %><br /><%: Html.ValidationMessageFor(model => model.EmailAddress) %> if i use both partial views on one page, it ends up having duplicate id's so validation happens across both views (even thopugh they are in seperate forms) how can i go about eliminating this

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  • C++ enum in foreach

    - by Spencer
    I've have a card class for a blackjack game with the following enums: enum Rank { Ace, Two, Three, Four, Five, Six, Seven, Eight, Nine, Ten, Jack, Queen, King }; enum Suit { Clubs, Diamonds, Hearts, Spades }; When I create the deck I want to write the code like this: // foreach Suit in Card::Suit // foreach Rank in Card::Rank // add new card(rank, suit) to deck I believe there is no foreach in c++. However, how do I traverse an enum? Thanks, Spencer

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  • Make a jqGrid moveable

    - by Dave
    As it appears that jqGrid is based on the jQuery dialog, is it possible to make it movable (like a dialog)? I've been able to put it inside of a dialog but it looks odd with two title bars and such. I'd "think" that the necessary class could be added to it to make it movable but I'm still fairly new at both jQuery and jqGrid.

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  • Importing a SQL Server 2005 Profile Trace Template into SQL 2008

    - by David Stein
    I'm using SQL Server 2008, but my ERP Vendor only offers a SQL 2005 trace template that they'd like me to run on my system. When I attempt to import it, I receive confirmation that it was successfully imported. However, it does not show up in the list of available templates. I've done this on two separate servers to the same effect. Is this a known problem with SQL Server 2008? I Googled unsuccessfully.

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  • How to change easily between ajax-based website and basic HTML website?

    - by A.S al-shammari
    Hi, I have a website ( based on JSP/Servlets ,using MVC pattern), and I want to support AJAX-based website and basic HTML-based website. website visitors should be able to change the surfing mode from Ajax to basic HTML and vise versa, - as it applies in Google-mail. The Questions : What is the best way to achieve this goal easily? Should I design two views for each page? I use JQuery and JSON as the result of this answer.

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  • dates and times in emacs lisp

    - by Stephen
    Hi, I understand emacs lisp is great for handling dates and times, but does it have a function to convert strings to internal representation of integers using formats like %Y, %m, %d, %H, %M, %S, and so on? And also, in the emacs reference manual, it says that times are lists of two or three integers, but is there a more formal specification or description? ~ Thanks ~

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  • Normalizing URI to make it work correctly with MakeRelativeUri

    - by dr. evil
    Dim x AS New URI("http://www.example.com/test//test.asp") Dim rel AS New URI("http://www.example.com/xxx/xxx.asp") Console.Writeline(x.MakeRelativeUri(rel).Tostring()) In here output is: ../../xxx/xxx.asp Which looks correct almost all web servers will process the two of the following as same request: http://www.example.com/test//test.asp http://www.example.com/test/test.asp What's the best way to fix this behaviour is there any API to do this, or shall manually create a new URI and remove all // in the path?

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  • Hotel Reservation system Database schema

    - by SpikETidE
    Hi Everyone.... I am about to develop a online hotel reservation system...using php and mysql... I have some doubts about my current database schema and the business logic to get the hotels in which rooms are free between two particular dates... Does anyone know of some kind of tutorial where i can get some idea about the hotel reservation schema and the business logics that should be used in the system...? Thanks for your suggestions....

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  • Zend_Paginator - Increase querys

    - by poru
    Hello, I started using Zend_Paginator, it works everything fine but I noticed that there is one more query which slows the load time down. The additional query: SELECT COUNT(1) AS `zend_paginator_row_count` FROM `content` The normal query: SELECT `content`.`id`, `content`.`name` FROM `content` LIMIT 2 PHP: $adapter = new Zend_Paginator_Adapter_DbSelect($table->select()->from($table, array('id', 'name'))); $paginator = new Zend_Paginator($adapter); Could I merge the two querys into one (for better performance)?

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  • Lifetime issue of IDisposable unmanaged resources in a complex object graph?

    - by stakx
    This question is about dealing with unmanaged resources (COM interop) and making sure there won't be any resource leaks. I'd appreciate feedback on whether I seem to do things the right way. Background: Let's say I've got two classes: A class LimitedComResource which is a wrapper around a COM object (received via some API). There can only be a limited number of those COM objects, therefore my class implements the IDisposable interface which will be responsible for releasing a COM object when it's no longer needed. Objects of another type ManagedObject are temporarily created to perform some work on a LimitedComResource. They are not IDisposable. To summarize the above in a diagram, my classes might look like this: +---------------+ +--------------------+ | ManagedObject | <>------> | LimitedComResource | +---------------+ +--------------------+ | o IDisposable (I'll provide example code for these two classes in just a moment.) Question: Since my temporary ManagedObject objects are not disposable, I obviously have no control over how long they'll be around. However, in the meantime I might have Disposed the LimitedComObject that a ManagedObject is referring to. How can I make sure that a ManagedObject won't access a LimitedComResource that's no longer there? +---------------+ +--------------------+ | managedObject | <>------> | (dead object) | +---------------+ +--------------------+ I've currently implemented this with a mix of weak references and a flag in LimitedResource which signals whether an object has already been disposed. Is there any better way? Example code (what I've currently got): LimitedComResource: class LimitedComResource : IDisposable { private readonly IUnknown comObject; // <-- set in constructor ... void Dispose(bool notFromFinalizer) { if (!this.isDisposed) { Marshal.FinalReleaseComObject(comObject); } this.isDisposed = true; } internal bool isDisposed = false; } ManagedObject: class ManagedObject { private readonly WeakReference limitedComResource; // <-- set in constructor ... public void DoSomeWork() { if (!limitedComResource.IsAlive()) { throw new ObjectDisposedException(); // ^^^^^^^^^^^^^^^^^^^^^^^ // is there a more suitable exception class? } var ur = (LimitedComResource)limitedComResource.Target; if (ur.isDisposed) { throw new ObjectDisposedException(); } ... // <-- do something sensible here! } }

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  • Can a memory page be moved by modifying the page table?

    - by Adam
    Is it possible (on any reasonable OS, preferably Linux) to swap the contents of two memory pages by only modifying the page table and not actually moving any data? The motivation is a dense matrix transpose. If the data were blocked by page size it would be possible to transpose the data within a page (fits in cache) then swap pages to move the blocks into their final place. A large matrix would have many many pages moved, so hopefully flushing the TLB wouldn't cause trouble.

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  • Segmentation fault in std function std::_Rb_tree_rebalance_for_erase ()

    - by Sarah
    I'm somewhat new to programming and am unsure how to deal with a segmentation fault that appears to be coming from a std function. I hope I'm doing something stupid (i.e., misusing a container), because I have no idea how to fix it. The precise error is Program received signal EXC_BAD_ACCESS, Could not access memory. Reason: KERN_INVALID_ADDRESS at address: 0x000000000000000c 0x00007fff8062b144 in std::_Rb_tree_rebalance_for_erase () (gdb) backtrace #0 0x00007fff8062b144 in std::_Rb_tree_rebalance_for_erase () #1 0x000000010000e593 in Simulation::runEpidSim (this=0x7fff5fbfcb20) at stl_tree.h:1263 #2 0x0000000100016078 in main () at main.cpp:43 The function that exits successfully just before the segmentation fault updates the contents of two containers. One is a boost::unordered_multimap called carriage; it contains one or more struct Infection objects that contain two doubles. The other container is of type std::multiset< Event, std::less< Event EventPQ called ce. It is full of Event structs. void Host::recover( int s, double recoverTime, EventPQ & ce ) { // Clearing all serotypes in carriage // and their associated recovery events in ce // and then updating susceptibility to each serotype double oldRecTime; int z; for ( InfectionMap::iterator itr = carriage.begin(); itr != carriage.end(); itr++ ) { z = itr->first; oldRecTime = (itr->second).recT; EventPQ::iterator epqItr = ce.find( Event(oldRecTime) ); assert( epqItr != ce.end() ); ce.erase( epqItr ); immune[ z ]++; } carriage.clear(); calcSusc(); // a function that edits an array cout << "Done with sync_recovery event." << endl; } The last cout << line appears immediately before the seg fault. I hope this is enough (but not too much) information. My idea so far is that the rebalancing is being attempting on ce after this function, but I am unsure why it would be failing. (It's unfortunately very hard for me to test this code by removing particular lines, since they would create logical inconsistencies and further problems, but if experienced programmers still think this is the way to go, I'll try.)

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  • creating child process

    - by rishabh
    Write a program to creates two childs by using send –pipe and receive –pipe primitives.Each child Process reads from a different serial line and sends the character read back to parent process through a pie. The parent process outputs all characters received. A child terminates when exclamation point character is received.The parent process terminates after both children have terminate.

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