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  • What technologies to use for a particle system with enormous calculation demand?

    - by Amir Rezaei
    I have a particle system with X particles. Each particle tests for collision with other particles. This gives X*X = X^2 collision tests per frame. For 60f/s, this corresponds to 60*X^2 collision detection per second. What is the best technological approach for these intensive calculations? Should I use F#, C, C++ or C#, or something else? The following are constraints The code is written in C# with the latest XNA Multi-threaded may be considered No special algorithm that tests the collision with the nearest neighbors or that reduces the problem The last constraint may be strange, so let me explain. Regardless constraint 3, given a problem with enormous computational requirement what would be the best approach to solve the problem. An algorithm reduces the problem; still the same algorithm may behave different depending on technology. Consider pros and cons of CLR vs native C.

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  • Why is '\x' invalid in Python?

    - by Paul McGuire
    I was experimenting with '\' characters, using '\a\b\c...' just to enumerate for myself which characters Python interprets as control characters, and to what. Here's what I found: \a - BELL \b - BACKSPACE \f - FORMFEED \n - LINEFEED \r - RETURN \t - TAB \v - VERTICAL TAB Most of the other characters I tried, '\g', '\s', etc. just evaluate to the 2-character string of a backslash and the given character. I understand this is intentional, and makes sense to me. But '\x' is a problem. When my script reaches this source line: val = "\x" I get: ValueError: invalid \x escape What is so special about '\x'? Why is it treated differently from the other non-escaped characters?

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  • Drupal removing javascript from Full HTML link

    - by Jen
    I am new to Drupal and am trying to create a node (let's call it child) that will only really be accessed when clicked on from another node (we'll call it parent). When closing the child window, I want to parent window to refresh. Outside of Drupal, that's easy: <a onclick="window.close(); window.opener.location.reload();" href="#">Click to close this window</a> However, when I type this into the body of a node using Full HTML, it still strips the onclick text from my post. How can I include javascript in the body of a node like this? Is there a special module I need. Thanks!

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  • How to set full control to a directory??

    - by smwikipedia
    I am using the following simple code to add full control to a directory, but it doesn't work. String dir_name = @"folder_full_path"; DirectorySecurity dir_security = Directory.GetAccessControl(dir_name); FileSystemAccessRule access_rule = new FileSystemAccessRule(@"AccountName", FileSystemRights.FullControl, AccessControlType.Allow); dSecurity.AddAccessRule(access_rule); Directory.SetAccessControl(dir_name, dir_security); But this code only set special permissions to the target folder. This code is almost the same as the MSDN sample. I am scratching my head for a reasonable explanation... Hope someone could shed some light on me. Many thanks.

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  • Development Applications on big devices vs mobile phones: Similarities/Disimilarities

    - by Richard77
    Hello, I saw a news document on applications running in mobile devices. And, I believe that might be interesting for people where I live (Internet is not developed - but the cellphone networks are much better). So here are my questions: Where can I find documentation for beginners on that matter (And most importantly) Am I gonna be able to take advantage of acquired knowledge in .NET framework (C#, MVC, JQuery, XHTML, ...)? Am I gonna need my laptop or a special device to develop applications? Am I gonna need Visual Studio? And so on... Bref, What are similarities/dissimilarities between developments for applications running in big machines and those running on mobile phones? Thanks for helping

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  • Function to identify problematic datatypes

    - by Zach
    I just spent several hours debugging some R code, only to discover that the error was due to an Inf that had sneaked in during my calculations. I had checked for NA, but hadn't thought to check for Inf. I wrote the following function to help prevent this situation in the future: is.bad <- function(x){ is.na(x) | is.nan(x) | is.infinite(x) } > is.bad(c(NA, NaN, Inf, -Inf, 0, 1, 1000, 1e6)) [1] TRUE TRUE TRUE TRUE FALSE FALSE FALSE FALSE Are there any other special data types in R I should be aware of?

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  • Storing a big xml string in a xml document in java

    - by shyam R
    Hi All, I Have a Java object which I am converting into a xml file. I am getting a big xml file here after converting java object. I am capturing that converted xml file in a string like below String ouputXML = xmlfile; Noe If I pring the ouputXML on the console of IBM RSA in the proper format only it is printing but my requirement is I need to redirect outputXML in to an XML instead of printing in IBm RSA console. I am able to do this but the problem is if I open the craetd XML file the xml structure is not proper , it is showing so many special characters . Please help me !!

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  • Feedly "Login with Google" system

    - by AR
    I'm trying to figure out how Feedly does their login with Google link. Based on the redirect URL it passes I'd think it was a google service, but at the same time, the login page says it's not associated "Note: Google is not affiliated with feedly. Your password will not be shared with the feedly service". Anyone know what exactly powers this? Is it Federated login with some special domain trickery allowing them to upload a site screenshot and description? Or is it something else.

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  • Reading Connection String from a class Library

    - by devnet247
    Hi all I have a .net class library 2.0 with an app.config with a connectionString section. I have 01 Method that this class library exposes " string GetConnectionString(string name) However even though the app.config in this class library has 3 connstrings it does not read this config.exe.How can I make it read the app.config that resides withing this dll? Again, Usually you will have a web or windows app with a config and it will all work. Mine is a special case I need to read the connectionstring within this class library. How can I do it? thanks a lot

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  • WCF Diagnostics tracing and WAS hosting?

    - by Per Salmi
    I have a WAS hosted set of services configured to use net.tcp running under an IIS AppPool user account. When hosting the services with WAS I have a hard time getting any diagnostic tracing out of them to track down problems. The same services with tracing set to use i.e. c:\logs\trace.svclog as trace output works fine when using self-hosting in a console application. I don't seem to get any trace output at all when hosting with WAS, are there any special settings I need to get trace output under WAS? I have set a fixed output path for tracing and assigned permissions to the folder for the IIS AppPool\MyAppPool-user. /Per Salmi

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  • Comparing Design Patterns

    - by Lijo
    Hi, I am learning design patterns using C#. One of the challenges that I am facing is that they look similar. Could you please help me to distinguish them – basically when to use them? - Why not the other? Bridge and Strategy State and Strategy Façade and Strategy Composite and Strategy I understand that there are lots of resources available in the web. However they does not treat this special question. [Note: I am looking for implementation examples and rationale behind the selection; not mere explanations] It would be great if you are taking examples from any of the following 1) E-Commerce 2) Payroll system 3) Banking 4) Retailing Thanks for your understanding.. Thanks Lijo

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  • Upgrading IIS web sever framework 2.0 to 3.5 considerations

    - by Grant
    Hi, i will be responcible for upgrading an IIS web server from the Microsoft .NET framework v2.0 to v3.5. I am wondering if there is anything special i need to know or any caveats i should be aware of before proceding? The site gets a fair number of hits per day and I will be taking it down and performing the upgrade at an off-peak time. Aside from double clicking the installer is there anything i need to know? Will the server need to be rebooted afterwards, does the installer handle all of the configuration changes? etc.. Thanks.

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  • What is the best software to write and organize written copy / content for a website?

    - by johnqtaxpayer
    I'm a newbie product manager, looking for tips on how to write and organize text copy for my company's website. I need to be able to prepare the content for our public site and turn it over to the web designer who publishes it to our live site. I want our UI team to be able to quickly glance at the copy I write and immediately know where on the page I intend for it to go. Currently, I'm using microsoft word to write and color code different text to signify where I want specific text to go. It is difficult for the UI guy to immediately know if something goes into the nav bar or into a header or a description below a header. In addition to that, it would be helpful for me to be able to write the copy in such a way that the web designer could copy and paste it into the XHTML without having to go back and manually replace special punctuation characters with the XHTML entities. What software is out there that will allow a comprehensive solution to these web copywriting issues?

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  • How to temporarily change all default user settings without destroying the original?

    - by mystify
    My app is based strongly on a lot of NSUserDefault keys and values. I want to implement a temporary defaults profile which the user can activate to get a special task done easily. For this, some of the user defaults must be changed temporarily so the app adjusts it's interface appropriately. I started to just manually change those NSUserDefaults settings, but this also destroys the user's original settings. Is it possible to keep a backup of the user's NSUserDefault settings and restore them after the user quits the temporary mode or the app? Like I see it, NSUserDefaults actually is just an NSMutableDictionary which is generated out of a plist file. So I would just make a deep copy of that and later assign that copy somehow back to NSUserDefaults?

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  • Do encryption algorithms provide really unique results?

    - by Mikulas Dite
    I was wondering whether md5, sha1 and anothers return unique values. For example, sha1() for test returns a94a8fe5ccb19ba61c4c0873d391e987982fbbd3, which is 40 characters long. So, sha1 for strings larger than 40 chars must be the same (of course it's scrambled, because the given input may contain whitespaces and special chars etc.). Due to this, when we are storing users' passwords, they can enter either their original password or some super-long one, which nobody knows. Is this right, or do these hash algorithms provide really unique results - I'm quite sure it's hardly possible.

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  • asp.net drop down list viewstate issue after client side Ajax update

    - by DSharper
    In my aspx page I have drop down list that initialy in page load event loads up with list of values which is shown to client(drop down list "A") and in client side, depending on client selecion of another drop down list(drop down list "B") I have written a javascript to update drop down list "A" with corresponding values with Ajax behaviour(without full page postback). But when we post page to the server, in server side page load event shows initialy sent list of values for drop down list "A" but not the values that were loaded by Ajax calls due to ViewState not being updated correctly due to Ajax call. I could fix this easily with update panel but it increased Ajax request size to 44KB which is much higher than what currently is for hand made Ajax script I have written( 0.5KB) Is there special way of fixing this rather than using update panel?

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  • Change save to file name but from the client

    - by Rhythmic Algorithm
    This question asks about file name the servers sends and the fix was quite simply a content-disposition header in the http response. What I interested in is does anyone know of any way to do this from the client side if the file name is already known? Is there any special javascript to do this for example? A site I have to use but not mine has a FileDownload.aspx but it doesn't send the content-disposition header. I know the filename and would like to be able to create a firefox extensions to use for the poorly coded web site. Thanks

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  • How do I split Chinese characters one by one?

    - by Nano HE
    If there is no special character(such as white space, : etc) between firstname and lastname. Then how to split the Chinese characters below. use strict; use warnings; use Data::Dumper; my $fh = \*DATA; my $fname; # ??; my $lname; # ? ; while(my $name = <$fh>) { $name =~ ??? ; print $fname"/n"; print $lname; } __DATA__ ??? Output ?? ?

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  • How do I programmatically add a widget to a container created from GtkBuilder?

    - by Warner Young
    I've created a window that has some containers and widgets in it, and I want to add a new widget dynamically at run-time to one of the Vboxes in this window. So I have this code, which brings up the window: gtk_builder_add_from_file( g_builder, "window.xml", NULL ); mainwindow = GTK_WIDGET( gtk_builder_get_object( g_builder, "window" )); gtk_widget_show( mainwindow ); Then I create a new label, for example, and add it to one of the existing Vboxes, called "vbox_mid", like this: label = gtk_label_new( "Test label" ); vbox = GTK_WIDGET( gtk_builder_get_object( g_builder, "vbox_mid" )); gtk_box_pack_end( GTK_BOX( vbox ), label, TRUE, TRUE, 0 ); But this doesn't seem to work. I don't see a new label in the vbox. I have a feeling I'm missing something here, but I can't see what it is. I thought perhaps there was a special GtkBuilder call to add a widget dynamically, but I don't see anything that looks like that. I would really appreciate any help on this.

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  • Tabular.vim : how to align on the first occurrence of 2 different delimiters placed at the beginning of Words?

    - by ThG
    I have installed the Tabular plugin, which works very well for me, as long as there are no complicated regexes involved… But I have this list : one @abc @rstuvw &foo three @defg &bar four @mn @opq &kludge &hack twelve @hijkl &baz &quux I wish to align it that way (on @… first, then on &…) : one @abc @rstuvw &foo three @defg &bar four @mn @opq &kludge &hack twelve @hijkl &baz &quux which means I have 3 problems at the same time : align on the first occurrence of 2 different delimiters (@ and &) which are not really delimiters but "special characters" at the beginning of Words This is far beyond my understanding of both regexes and Tabular.vim How should I proceed ?

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  • What tools do people use to make programming tutorial videos?

    - by Pure.Krome
    Hi folks, I'm wanting to make some yee-run-o-the-mill tutorial video's about some programming concepts and stuff i've been doing. Nothing special ... lots of peeps been doing it. What tools are people using to record and edit these videos? What resolutions / fonts / sizes do people generally use/set? The only tool I've had experience with is Camtasia - and i didn't mind it. But i've seen vid's (or live demo's) where people zoom in to code sections.. how do they do that? For final editing, do most people just do some simple power point presentation with some video snippets mashed in. cheers!

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  • How can you prevent a window being captured by Print-Screen?

    - by John
    I noticed a few times than when I print-screen while Media Player is running, the content is replaced with a grey rectangle. I've no idea if it's deliberate due to DRM, or some technical issue, but it struck me that being able to deliberately block screen-capture might be a useful feature in some scenarios. Is there some specific message each HWND gets for print-screen - does Windows do a special repaint or simply dump buffers to the clipboard? I guess I'd prefer to focus this on Win32 specifically, but as long as it's Windows-related then fine.

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  • Writing a simple incrementer counter in rails

    - by Trip
    For every Card, I would like to attach a special number to them that increments by one. I assume I can do this all in the controller. def create @card = Card.new(params[:card]) @card.SpecNum = @card.SpecNum ++ ... end Or. I can be blatantly retarded. And maybe the best bet is to add an auto-incremement table to mysql. The problem is the number has to start at a specific number, 1020. Any ideas?

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  • Safe ASCII char to replace whitespace before storing

    - by AngryWhenHungry
    My code passes a big bunch of text data to a legacy lib, which is responsible for storing it. However, it tends to remove trailing whitespace. This is a problem when I read the data back. Since I cannot change the legacy code, I thought about replacing the all spaces with some uncommon ASCII character. When I read back the text, I can replace them back. Is this a bad idea, considering that I cannot touch the legacy storage code? Which character can I use as a substitute? I was considering some char upwards of 180. There will only be spaces - no tabs or newlines - in the data. The data is alphanumeric, with special characters.

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  • Passing a String from PHP to a JavaScript function

    - by user635614
    Hello. am trying to write a code to pass a php string when clicked on the table : <?php . . . echo("<td onclick = 'print_("$file[$i]->Name");' >". $files[$i]->Name."</td>"); ... ?> where files[] is an array, and each element is a class with Name as a String, and it is put in a ''for'' loop, Am trying to pass it to a JavaScript function where i need the name there,and it's not working,i tried passing the i variable and it was passed correctly so i thought there should be a special syntax for dealing with strings... function print_(var x) { alert(x);}

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