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• Django Project Done and Working. Now What?

  - by Rodrogo

  Hi, I just finished what I would call a small django project and pretty soon it's going live. It's only 6 models but a fairly complex view layer and a lot of records saving and retrieving. Of course, forgetting the obvious huge amount of bugs that will, probably, fill my inbox to the top, what would it be the next step towards a website with best performance. What could be tweaked? I'm using jmeter a lot recently and feel confident that I have a good baseline for future performance comparisons, but the thing is: I'm not sure what is the best start, since I'm a greedy bastard that wants to work the least possible and gather the best results. For instance, should I try an approach towards infrastructure, like a distributed database, or should I go with the code itself and in that case, is there something that specifically results in better performance? In your experience, whats pays off more? Personal anecdotes are welcome, but some fact based opinions are even more. :) Thanks very much.

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• C++ methods which take templated classes as argument.

  - by Nils

  I have a templated class Vector<class T, int N> Where T is the type of the components (double for example) and n the number of components (so N=3 for a 3D vector) Now I want to write a method like double findStepsize(Vector<double,2> v) {..} I want to do this also for three and higher dimensional vectors. Of course I could just introduce further methods for higher dimensions, but the methods would have a lot of redundant code, so I want a more generic solution. Is there a way to create a method which takes a templated class without further specializing it (in this case without specifying T or N)? Like double findStepsize(Vector<T,N> v) ?

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• Implemention of scattering in this paper

  - by pelb

  Hi, For some time I tried implementing the scattering model described in this paper: Salama Paper The BRDF part of this paper is pretty clear and straightforward. Where I am hanging is the scattering part. When scattering at the first hitpoint once only, I'm just not getting the same results as proposed by the images in the very same paper. Of course I'm scattering multiply rays inside the proposed scattering cone and averaging the results of the different rays. Does anyone have more or less concrete ideas on the implementation of this nice and beautiful illustrative rendering method. I am glad and thankful for any hints.

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• Optimizing MySQL queries with IN operator

  - by Arkadiusz Kondas

  I have a MySQL database with a fairly large table where the products are. Each of them has its own id and categoryId field where there is a category id belongs to this product. Now I have a query that pulls out products from given categories such as: SELECT * FROM products WHERE categoryId IN ( 1, 2, 3, 4, 5, 34, 6, 7, 8, 9, 10, 11, 12 ) Of course, come a WHERE clause and ORDER BY sort but not in this thing. Let's say that these products is 250k and the visits are over 100k per day. Under such conditions in the table slow_log registered weight of these queries with large generation time. Do you have any ideas how to optimize the given problem? Table engine is MyISAM.

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• GIT sharing configuration data

  - by user569980

  Hi, I just started using GIT for my versioning and I want to program some tools that work on top of it. Here is my question: Which information in the .git/config is shared to a remote repo? Is any? Is there a special way to push information to that repo? The reason I am asking is that I would like to add a "unique stamp" to the config of a repo. Also the remote repo and everybody pulling that project should have the stamp. Is that possible? If not, is there any other way to identify a repository? Having a .git folder, I want to decide whether this git repo is the same as a previously specified remote repo (the same means created by pulling the remote repo, changes are okay, of course).

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• Error including errno.h

  - by TechWiz

  Every time I try to compile a project that includes errno.h in linux, I get issues using the error codes. GCC spits out errors saying the error codes aren't declared and I get the same issue with 3rd party projects that are, of course, known to compile. I have the Linux headers for my kernel installed. Any suggestions as to what else it could be? edit: Snippet at error code: if ((res != 0) && (errno == EEXIST)) Snippet of includes: ... #include <dirent.h> #include <errno.h> #include <stdarg.h> ... as is with no ifdef edit: Well I'm convinced my system's Linux headers are hosed somehow... that, or I'm missing some environment vars.

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• Paginator (Migration from Cake 1.3 to 2.0

  - by Christian Waschke

  i am struggling with the paginator in cakephp 2.0. While i am trying to migrate my application to 2.0 i cant find any solution to jump directly to the last page. In 1.3 it was quiet to do that from outside like this: echo $this->Html->link(__('Flights'), array('controller' => 'flights', 'action' => 'index','page' => 'last')); but this little trick putting 'page:last' in does not work anymore in 2.0. Of course there is a Paginator function called last, but this would only help if i would be already inside the app. My Problem is to access from an outside link directly the last page of the paginator. Thank you for reading, cdjw

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• CouchDB: How to change view function via javascript?

  - by osti

  Hello Guys, I am playing around with CouchDB to test if it is "possible" [1] to store scientific data (simulated and experimental raw data + metadata). A big pro is the schema-less approach of CouchDB: we have to be very flexible with the metadata, as the set of parameters changes very often. Up to now I have some code to feed raw data, plots (both as attachments), and hierarchical metadata (as JSON) into CouchDB documents, and have written some prototype Javascript for filtering and showing. But the filtering is done on the client side (a.k.a. browser): The map function simply returns everything. How could I change the (or push a second) map function of a specific _design-document with simple browser-JS? I do not think that a temporary view would yield any performance gain... Thanks for your time and answers. [1]: of course it is possible, but is it also useful? feasible? reasonable?

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• Merge 2 lines into one

  - by shantanuo

  I have a text file starts with 9 digits college code and ends with of 5 digits course code. 512161000 EN5121 K. K. Jorge Institute of Engineering Education and Research, Nashik 61220 Mechanical Engineering [Second Shift] XOPENH 1 116 16978 517261123 EN5172 R. C. Rustom Institute of Technology, Shirpur 61220 Mechanical Engineering [Second Shift] YOPENH 1 100 29555 617561234 EN6175 abc xyz Education Trust, abc xyz College of Engineering, Pune 61220 Mechanical Engineering [Second Shift] ZOPENH 2 105 25017 There are some entries where there is a line break as shown in the 3 example above. I need to merge 3rd and 4th line into one just like 1st and 2nd line, so that I can easily use command like grep, awk etc.

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• Is there any way around the Chrome 5 breakage of Ajax for local files?

  - by nikow

  The recent Chrome 5.0 release completely blocks XMLHTTPRequest requests for local files comming from a local file. Here is just one of the many related bug reports and here is the code change (there is also a SO question caused by this). This breaks a lot of production code, e.g. for documentation systems. Users must be able to browse local documentation without the need to install anything or run executables. My question is if there is any way around this restriction? I'm only interested in solutions that don't require any fancy actions on the users side (nothing beyond a confirmation dialog). Is there any way the HTML5 File API could be used, or maybe postMessage()? Of course this whole issue is very frustrating for many people. Firefox takes a fare more reasonable approach and allows requests inside the directory. So it seems unlikely that other browser vendors will follow Chrome.

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• increasing speed and efficiency of ajax call

  - by user1048824

  I'm not the most disciplined dev, dont know standards and am self-taught so bear with me. I create stuff very logically and fast but not always using 'programming standards'. I have a mobile app using geolocation API. it gets thousands of places from my db and makes gmaps v3 markers for the ones around the user's current location. there is an ajax call from my JS to an aspx page that calls the database, makes a json string, and sends the json string to the javascript that then creates the google map markers. would i save time if the json string was in a flat file? im not sure if, generally speaking, accessing a sql db from an aspx page is faster than c# file i/o on a flat file with pre-rendered JSON. (of course, using the flat file, it would update everytime the db is updated)

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• Neural network for aproximation function for board game

  - by Pax0r

  I am trying to make a neural network for aproximation of some unkown function (for my neural network course). The problem is that this function has very many variables but many of them are not important (for example in [f(x,y,z) = x+y] z is not important). How could I design (and learn) network for this kind of problem? To be more specific the function is an evaluation function for some board game with unkown rules and I need to somehow learn this rules by experience of the agent. After each move the score is given to the agent so actually it needs to find how to get max score. I tried to pass the neighborhood of the agent to the network but there are too many variables which are not important for the score and agent is finding very local solutions.

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• port an iOS (iPhone) app to mac?

  - by William Jockusch

  Is there a preferred way to go about this? The app in question is not too large . . . single-player game that I wrote over the course of a couple of months. EDIT: I should add that I have no experience with mac development . . . outside of what comes naturally with being an iOS developer. EDIT: Classes heavily used in the game: subclasses of NSObject, UIView, and UIViewController. I don't know much about NSView, but I'm pretty sure all the UIView stuff will work in that class. Also some use of UITableViewController. I do also have Game Center, but I can leave that part out for now. There is no multi-touch.

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• How to detect if an element exists in Watir

  - by Rijksband

  Hi, I'm relatively new to Watir but can find no good documentation (examples) regarding how to check if an element exists. There are the API specs, of course, but these make precious little sense to me if I don't find an example. I've tried both combinations but nothing seems to work... if browser.image (:src "/media/images/icons/reviewertools/editreview.jpg").exists then... if browser.image (:src "/media/images/icons/reviewertools/editreview.jpg").exists? then... If anyone has a concrete suggestion as per how to implement this, please help! Thanks!

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• Creating a CD auto-start dialog

  - by emilyshaun

  For me, compact discs and these customized auto-start dialogs are somewhat outdated and waste... However, I have to create such a dialog as an index for a CD consisting of a few PDF files. Making one to work on Microsoft Windows is quite easy. As there might be users from different platforms (Unix, Apple,...), the question raises how to offer them such a (auto-starting) dialog as well. Java is of course an option, but I think it's overloaded and naturally too slow for this purpose. Now, I think of a single webpage that will appear in the local browser. Using all these web standards this could a very creative, light-weight approach working on most systems. Do you see any problems that might occur here? Probably, there is a different and more elegant solution to this issue?

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• How can I get my app ready for the iPhone 5

  - by RazorSharp

  Apple just announced the iPhone 5 with a 4 inch screen and a 16:9 aspect ratio. Of course, they only give developers two weeks to scramble to update their apps without being able to test. I'd like to update my app for the iPhone 5's new big screen, but there's nothing on Apple's developer site about the iPhone 5 or making your apps ready for a larger screen. It would be a pain to have to write my own logic for testing whether the device is an iPhone 5 and then displaying a custom storyboard file for it. Does anyone know how the new sizing works or if there are any hidden Xcode for this?

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• scope of variables java

  - by qxc

  Is a variable inside the main, a public variable? public static void main(String[] args) { ......... for(int i=0;i<threads.length;i++) try { threads[i].join(); } catch (InterruptedException e) { e.printStackTrace(); } long time=0; .... } i and time are they both public variables? Of course if my reasoning is correct, also any variable belonging to a public method should be considered public.. am i right? Thanks

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• How can I loop through all the open instances of a particular form?

  - by raz3r

  I need to update a ListBox of a Form2 created dinamically. Let's say that in the event where I have to update this ListBox (in Form1 of course) I don't have a reference of this Form2 so I can't call the UpdateList method (and no, I can't make it static). I don't even know if there is a Form2 opened, it could be or not. What do you suggest? Is there a way to loop through all the open istances of Form2? Code Sample: //Form1 public void event() { //UPDATE FORM2 LISTBOX } //SOMEWHERE IN FORM1 Form2 runTime = new Form2(); //Form2 public void UpdateList() { //UPDATE LISTBOX }

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• SVN update a working copy when parents are updated

  - by ruckuus

  I have two SVN branches and I plan to partially copy the first working copy to another. I did this: Libs /home/user/projects/libs/{lib1, lib2, lib3} Core /home/user/projects/Apps/{libs,core} svn copy --parents /home/user/projects/libs/lib1/* /home/user/projects/Apps/libs/1 svn copy --parents /home/user/projects/libs/lib2/* /home/user/projects/Apps/libs/2 svn copy --parents /home/user/projects/libs/lib3/* /home/user/projects/Apps/libs/3 The question: My peers are still working on /home/user/projects/libs/lib1, and when this repository is updated with new codes, I want my /home/user/projects/Apps/libs also updated. Is there any way to do that "automatically"? I tried to do with the same svn copy command, and of course it fails with: svn: Path '/home/user/projects/Apps/libs/1' already exists

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• ActionScript - One Button Limit (Exclusive Touch) For Mobile Devices?

  - by TheDarkIn1978

  two years ago, when i was developing an application for the iPhone, i used the following built-in system method on all of my buttons: [button setExclusiveTouch:YES]; essentially, if you had many buttons on screen, this method insured that the application wouldn't be permitted do crazy things when several button events firing at the same time. problematic: ButtonA and ButtonB are available. each button has a mouse up event which fire a specific reorganization/layout of the UI. if both button's events are fired at the same time, their events will likely conflict, causing a strange new layout, perhaps a runtime error. solution: application buttons cancel any current pending mouse up events when said button enters mouse down. private function mouseDownEventHandler(evt:MouseEvent):void { //if other buttons are currently in a mouse down state ready to fire //a mouse up event, cancel them all here. } of course it's simple to manually handle this if there are only a few buttons on stage, but managing buttons becomes more and more complicated / bug-prone if there are several / many buttons available. is there a convenience method available in AIR specifically for this functionality?

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• name of the class that contains the method code

  - by kdlp

  I'm trying to find the name of the class that contains method code. In the example underneath I use self.__class__.__name__, but of course this returns the name of the class of which self is an instance and not class that contains the test() method code. b.test() will print 'B' while I would like to get 'A'. I looked into the inspect module documentation but did not find anything directly useful. class A: def __init__(self): pass def test(self): print self.__class__.__name__ class B(A): def __init__(self): A.__init__(self) a = A() b = B() a.test() b.test()

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• Inventory Management OOP design

  - by rgamber

  This was an OOP design and implementation interview question, which I came across on glassdoor.com. Design and implement a inventory management system to minimize the number of missed delivery dates while keeping costs to the company low. Of course there is no right answer to this, but I am not sure I understand the question correctly and am wondering what would be a good answer. Is this as simple as creating an undirected graph with nodes as the delivery points, and edges having weights as the cost of the delivery, and then use a single-source-shortest-path algorithm (like Dijkstras, or Bellman-Ford) on the graph? Not sure if this type of question should be asked here,so let me know and I will delete it.

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• PHP] How can I connect to MySQL on wamp server?

  - by user294359

  This might be ridiculously easy for you.. but I've been struggling with this for an hour.. :( <?php $connect = mysql_connect("localhost:8080", "root", "mypassword"); echo($connect);?> This is the code that I'm trying to run - you can see that I'm using 8080 as my port number and, of course, I have html codes as well. However, it gives me the following error msgs whenever I try to open the php file. ==================================================================================== Warning: mysql_connect() [function.mysql-connect]: MySQL server has gone away in C:\wamp\www\php_sandbox\index.php on line 2 Warning: mysql_connect() [function.mysql-connect]: Error while reading greeting packet. PID=4932 in C:\wamp\www\php_sandbox\index.php on line 2 Warning: mysql_connect() [function.mysql-connect]: MySQL server has gone away in C:\wamp\www\php_sandbox\index.php on line 2 ===================================================================================== I don't know... what's wrong with this. Is it because of the port number?

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• Button top increase with multiple lines

  - by NeTeInStEiN

  Some very very strange behaviour was appearing in my Android application. I was extending Button to replace the standard. In my own button I set: - TextAppearence (text 16px, bold..) - BackgroundDrawable (to an selector that replaced the standard button, that used images of 60px) - Gravity: LEFT|CENTER_VERTICAL. Whenever the text was enough to make the button have 2 text lines, if it had the property Gravity.CENTER_VERTICAL, a top padding would appear! This kept me overflowing and googling for weeks... (set paddingTop, singleLine, and other simple solutions didn't work of course!) Finally got the solution!!! @Override protected boolean setFrame(int l, int t, int r, int b) { int fixedTopSize = 5; return super.setFrame(l,fixedTopSize, r, b-t); } By overriding this method on the extended Button finally i got it to work without the irritating top padding... still i don't understand why this happens. Any ideia?

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• How to make my JavaScript code unusable by anyone else? [closed]

  - by egasimus

  Heh, that's something that many plugin authors do without needing help, isn't it? :) Here's the rub -- I'm coding a jQuery plugin which I have the intent to sell. I want to provide a live demo of it; of course, I don't want anyone just using the demo code. I know it's dumb, and it certainly doesn't bring any good karma, but what are some naughty things I can do in the demo script that would make life reasonably difficult for anyone trying to use it? Setting undefined = true comes to mind, as well as overriding jQuery methods. Any suggestions beyond that?

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