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• Calculate initial velocity to move a set distance with inertia

  - by Bodyscanner

  Hello, I want to move something a set distance. However in my system there is inertia/drag/negative accelaration. I'm using a formula like this for it: velocity = oldVelocity + ((velocity - oldVelocity * inertia) where inertia is a fractional value like 0.25 So to move the item a set distance, I need to calculate what the initial velocity should be (I know what all the other values are). I've been looking at Equations of motion (http://en.wikipedia.org/wiki/Equations_of_motion) but can't work out what the correct one for my problem is... Any ideas? Thanks!

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• Connecting Flash AS2 (or AS3) to BlazeDS

  - by mattstuehler

  All, I'm looking for some information on connecting a Flash (not Flex) application to Blaze DS. (A Google search is surprisingly unhelpful...) Adobe's mini-site about BlazeDS (http://opensource.adobe.com/wiki/display/blazeds/Overview) mentions: Blockquote Welcome to BlazeDS! BlazeDS is the server-based Java remoting and web messaging technology that enables developers to easily connect to back-end distributed data and push data in real-time to Adobe® Flex™ and Adobe AIR™ applications for more responsive rich Internet application (RIA) experiences. ... which notably omits "Flash". Any insights or pointers would be greatly appreciated. Cheers, Matt

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• reStructuredText tool support

  - by Chen Levy

  I love reStructuredText, however the tools that support it are scattered all over the Internet. The official tool list is incomplete and/or outdated, and can be updated only via commit privileges. For some time there was a comprehensive list at the Wikipedia reStructuredText page, but this apparently "may not meet the notability guideline for web content" and is scheduled for removal. So to put it in a question form: What tool support can one expect to find when working with reStructuredText, e.g. text editors, Wiki software, converters to and from reStructuredText etc.?

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• Why Chrome does not show CSS3 ::-webkit-scrollbar scrollbar for iframe?

  - by Binyamin

  Why Chrome does not show CSS3 ::-webkit-scrollbar scrollbar for iframe? Demo http://jsfiddle.net/laukstein/C9s3P/ <iframe scrolling="yes" style="overflow-x:hidden; overflow-y:scroll; width:150px; height:50px;" src="http://en.wikipedia.org/wiki/Web_browser"></iframe> CSS ::-webkit-scrollbar{ width:0.8em; height:0.8em; background-color:#fff; } ::-webkit-scrollbar:hover{ background-color:#eee; } ::-webkit-resizer{ -webkit-border-radius:4px; background-color:#666; } ::-webkit-scrollbar-thumb{ min-height:0.8em; min-width:0.8em; -webkit-border-radius:4px; background-color: #ddd; } ::-webkit-scrollbar-thumb:hover{ background-color: #bbb; } ::-webkit-scrollbar-thumb:active{ background-color:#888; }

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• binary protocols v. text protocols

  - by der_grosse

  does anyone have a good definition for what a binary protocol is? and what is a text protocol actually? how do these compare to each other in terms of bits sent on the wire? here's what wikipedia says about binary protocols: A binary protocol is a protocol which is intended or expected to be read by a machine rather than a human being (http://en.wikipedia.org/wiki/Binary_protocol) oh come on! to be more clear, if I have jpg file how would that be sent through a binary protocol and how through a text one? in terms of bits/bytes sent on the wire of course. at the end of the day if you look at a string it is itself an array of bytes so the distinction between the 2 protocols should rest on what actual data is being sent on the wire. in other words, on how the initial data (jpg file) is encoded before being sent. any coments are apprecited, I am trying to get to the essence of things here. salutations!

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• SyntaxError using gdata-python-client to access Google Book Search Data API

  - by isbadawi

  >>> import gdata.books.service >>> service = gdata.books.service.BookService() >>> results = service.search_by_keyword(isbn='0434003484') Traceback (most recent call last): File "<pyshell#4>", line 1, in <module> results = service.search_by_keyword(isbn='0434003484') ... snip ... File "C:\Python26\lib\site-packages\atom\__init__.py", line 127, in CreateClassFromXMLString tree = ElementTree.fromstring(xml_string) File "<string>", line 85, in XML SyntaxError: syntax error: line 1, column 0 This is a minimal example -- in particular, the book service unit tests included in the package also fail with the exact same error. I've looked at the wiki and open issue tickets on Google Code to no avail (and this seems to me more apt to be a silly error on my end rather than a problem with the library). I'm not sure how to interpret the error message. If it matters, I'm using python 2.6.5.

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• What's your take on the programming language Go?

  - by fbrereto

  I've just been told about a new programming language, Go, developed at Google by such notables as Ken Thompson and Rob Pike. Does anyone have any experience with it so far? What are your thoughts about how viable small- and large-scale applications could be developed with it? Relevant links (thanks to Lance Roberts; feel free to update these as necessary): Ars-Technica PC World Google Open Source Blog Tech Talk Video Go Mailing List

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• No IDLE for Python 3?

  - by NotSuper

  I installed Python 3.1 yesterday on my Windows Vista PC, and was surprised to find that the version of IDLE is 2.6.4, for "Python 2.6.4 (r264:75708, Oct 26 2009, 08:23:19) [MSC v.1500 32 bit (Intel)] on win32" I was hoping to use IDLE to investigate some of the new features of Python 3... I guess I'm stuck with the command line... Anyone know what's up with Python 3's IDLE? Thanks

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• how to get trac to run with apache?

  - by ajsie

  i have some problems getting trac to be running with apache. have no idea of how to do and the tutorial i followed doesnt work. i have an empty /etc/apache2/httpd.conf. should it be empty? then i followed the tutorial (http://trac.edgewall.org/wiki/TracModPython) and typed in: LoadModule python_module modules/mod_python.so so now it contains one row. i have ubuntu and i installed mod_python with: apt-get install libapache2-mod-python libapache2-mod-python-doc however, when i run a2enmod mod_python it says: ERROR: Module mod_python does not exist! but i have checked that it exists in /usr/lib/apache2/modules/mod_python.so. so whats the problem?

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• Facebook Canvas Apps, New API

  - by James

  I'm having some trouble with switching to the new JS API for a number of things with creating applications within FB, specifically the "Tab". <!-- function do_perm() { Facebook.showPermissionDialog('publish_stream,email,offline_access', null); } //--> This no longer works for me when called via an onclick command. Also, with the new API and an FBML app. How does this exactly work? The documentation is really poor so I am confused when looking at the old wiki, and the new developer site. Apologies for being pretty vague, but I'm just generally confused with the lack of clear direction with the new API and help would be greatly appreciated. I'm simply just trying to create a call that prompts for the new style user permission dialog, and oncomplete calls another JS function.

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• Embedded Linux for total beginner

  - by sasayins

  Hi, I want to learn how to develop in embedded linux. What materials should I need? I don't have the actual embedded device so I plan to use some device emulator for the PC. I want to know how to load the kernel and the filesystem in the device. Many thanks.

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• Large data processing in x86 C# gives System.OutOfMemory exception

  - by Cool

  I am processing XML coming from server which contains both images and data in one C# function (compiled 32 bit). When I try to parse this xml in memory it gives me System.OutOfMemory exception. Is there any way to avoid this error? My guess is, system cannot find contiguous block of 50-100MB memory. (my pc hv 8Gig ram and its quad core)

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• ASP.NET MVC View Engine Comparison

  - by McKAMEY

  EDIT: added a community wiki to begin capturing people's experience with various View Engines. Please respectfully add any experiences you've had. I've been searching on SO & Google for a breakdown of the various View Engines available for ASP.NET MVC, but haven't found much more than simple high-level descriptions of what a view engine is. I'm not necessarily looking for "best" or "fastest" but rather some real world comparisons of advantages / disadvantages of the major players (e.g. the default WebFormViewEngine, MvcContrib View Engines, etc.) for various situations. I think this would be really helpful in determining if switching from the default engine would be advantageous for a given project or development group. Has anyone encountered such a comparison?

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• Using Valgrind tool how can I detect which object trying to access 0x0 address ?

  - by Davit Siradeghyan

  I have this output when trying to debug Program received signal SIGSEGV, Segmentation fault 0x43989029 in std::string::compare (this=0x88fd430, __str=@0xbfff9060) at /home/devsw/tmp/objdir/i686-pc-linux-gnu/libstdc++-v3/include/bits/char_traits.h:253 253 { return memcmp(__s1, __s2, __n); } Current language: auto; currently c++ Using valgrind I getting this output ==12485== Process terminating with default action of signal 11 (SIGSEGV) ==12485== Bad permissions for mapped region at address 0x0 ==12485== at 0x1: (within path_to_my_executable_file/executable_file)

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• Is "map" a loop?

  - by DVK

  While answering this question, I came to realize that I was not sure whether Perl's map can be considered a loop or not? On one hand, it quacks/walks like a loop (does O(n) work, can be easily re-written by an equivalent loop, and sort of fits the common definition = "a sequence of instructions that is continually repeated"). On the other hand, map is not usually listed among Perl's control structures, of which loops are a subset of. E.g. http://en.wikipedia.org/wiki/Perl_control_structures#Loops So, what i'm looking for is a formal reason to be convinced of one side vs. the other. So far, the former (it is a loop) sounds a lot more convincing to me, but I'm bothered by the fact that I never saw "map" mentioned in a list of Perl loops.

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• How to Tortoise to move repository without losing history

  - by carter-boater

  I have a repository on my PC. Now I want to move some project to a online svn server. This server doesn't provide ftp access, so I couldn't copy svn folder there.... Does anybody know how to move my project there without losing history. Thanks very much

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• DateTimePicker replacement that "respects" e.g. the CurrentUICulture

  - by S.C. Madsen

  Apparently the DateTimePicker does not "respect" or adhere to the CurrentUICulture of a .NET application, because DateTimePicker is a "Native" Common-control with a .NET wrapper (I think). I have a requirement to display "AM/PM" regardless of the regional settings of the PC running my .NET Winforms application. I would rather not re-implement my own DateTimePicker control, which adheres to the CurrentIUCulture. So does anybody know of a work-around or have a link to DateTimePicker control re-implementation?

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• Rate limiting Django admin login with Nginx to prevent dictionary attack

  - by shreddies

  I'm looking into the various methods of rate limiting the Django admin login to prevent dictionary attacks. One solution is explained here: simonwillison.net/2009/Jan/7/ratelimitcache/ However, I would prefer to do the rate limiting at the web server side, using Nginx. Nginx's limit_req module does just that - allowing you to specify the maximum number of requests per minute, and sending a 503 if the user goes over: http://wiki.nginx.org/NginxHttpLimitReqModule Perfect! I thought I'd cracked it until I realised that Django admin's login page is not in a consistent place, eg /admin/blah/ gives you a login page at that URL, rather than bouncing to a standard login page. So I can't match on the URL. Can anyone think of another way to know that the admin page was being displayed (regexp the response HTML?)

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• Creating an admin user in Devise on Rails beta 3

  - by erskingardner

  Ok, I'm probably going to feel quite dumb when someone answers this one with a simple thing that I'm missing but... here goes: I've got a brand new app on rails 3 beta and I'm using devise for the authentication. I've run all the comments and everything is working perfectly at the moment. I've created a user role and an admin role (following these instructions: http://wiki.github.com/plataformatec/devise/adding-an-admin-role) and I've registered myself as the first user but how to do I register or create an admin role user? The directions from the devise guys setup the admin role to not be registerable but I'm unsure how you're supposed to create the admin if you can't register?! Any help would be appreciated! Thanks!

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• Could it be that the stack size of a Web Service is smaller than that of a Window Application?

  - by mouthpiec

  Hi, I have a program that includes a recursive function. This function when executed in a Windows Application works just fine, and when used in a Webservice, it works fine when the webservice is initiated by the VS (it assigns a random port), but this function return a stackoverflow error when the webservice is published. (note that the machine used is the same, hence it is published on my pc). Could it be that the stack size of a Web Service is smaller than that of a Window Application?

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• Most mind-blowing C++ hack you've ever seen?

  - by sblom

  In the same spirit as the "Hidden features of X?" series, what are the most mind-blowingly well-executed "I didn't even think the language could do that!" hacks that you've ever seen in C++. For example, my recent favorite is an implementation of the "operator" --> for pre-C++0x lambdas. Another fantastic example is Multi-dimensional analog literals. (Note: this is a community wiki question to avoid the appearance of reputation-whoring.)

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• Soap Delphi Client end with a timeout for a 1MB call

  - by Cédric Girard

  Hi, we are developing a SOAP webservice (Apache/PHP). All run well for small size calls, but with a 1Mb soap call (the HTTPS call size is 1MB) our Delphi Soap client stop with a timeout on all PC but one, and our PHP clients run well with a default_socket_timeout=300, but stop with a "Error Fetching http headers" with default_socket_timeout=60. How can we change the timeout for Delphi? In fact this timeout seem to be in a Windows XP network library (wininet.dll called by soaphttptrans.pas) Thanks Cédric

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• Quickest way to find the oldest file in a directory using Delphi

  - by Pieter van Wyk

  HI We have a large number of remote computers that capture video onto disk drives. Each camera has it's own unique directory and there can be up to 16 directories on any one disk. I'm trying to locate the oldest video file on the disk but using FindFirst/FindNext to compare the File Creation DateTime takes forever. Does anybody know of a more efficient way of finding the oldest file in a directory? We remotely connect to the pc's from a central HO location. Regards, Pieter

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• Code::Blocks invalid compiler problem

  - by salifu

  i have installed successfully codeblock on my pc but when i try to run "hello world" or even another code, i get this messege of bluild log "name-Debug uses an invalid compiler. Skipping... nothing to be done" so please help me!

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• Purpose of Zope Interfaces?

  - by Nikwin

  I have started using Zope interfaces in my code, and as of now, they are really only documentation. I use them to specify what attributes the class should possess, explicitly implement them in the appropriate classes and explicitly check for them where I expect one. This is fine, but I would like them to do more if possible, such as actually verify that the class has implemented the interface, instead of just verifying that I have said that the class implements the interface. I have read the zope wiki a couple of times, but still cannot see much more use for interfaces than what I am currently doing. So, my question is what else can you use these interfaces for, and how do you use them for more.

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