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• La cinématique 2D et 3D, un article de Thibaut Cuvelier

  Bonjour, La physique, ce n'est pas seulement utiliser un moteur qui fait tous les calculs sans qu'on doive y réfléchir un tant soit peu. Comment un tel moteur peut-il fonctionner ? Sur quoi se base-t-il ? Cet article ne répondra pas aux questions techniques sur la conception du moteur, juste sur les notions qu'il modélise. Avant d'entamer des concepts plus avancés, voici la cinématique, la base de la mécanique, avec une seule dimension. La cinématique, des mouvements monodimensionnels Bonne lecture !...

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• DVC101 Video Capture Device on USB hub - Ubuntu Server 12.04

  - by John

  I have a Dell Inspiron 8600 laptop I use as a media server/video capture system. It only has 2 USB ports and I have a total of 3 devices I need to connect. The DVC101 works perfectly while plugged directly into the USB port in back of the laptop. Unfortunately it does not get recognized when plugged into a passive or powered USB hub. Questions: Is there something I am missing on the Ubuntu side? Something I need to do that will allow the device to be recognized through the hub? If not, will the extra USB ports on a dell laptop dock (port replicator) act the same as the aftermarket hubs? I know this one is off topic of Ubuntu but any input appreciated.

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• Google Maps API Office Hours

  Google Maps API Office Hours Interested in knowing more about the Google Maps API announcements that were made at I/O? During this week's Google Maps API Office Hours, +Josh Livni and +Paul Saxman will give an overview of the Google Maps API features that were announced at I/O, and will talk about the I/O session content that is now available online. The next Office Hours will be this Tuesday at 11am, Pacific Time. Bring your questions, and join us there! From: GoogleDevelopers Views: 167 9 ratings Time: 21:25 More in Science & Technology

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• April 25th Online Forum -- Oracle Solaris 11: What's New Since the Launch

  - by Larry Wake

  It's been a few months since we released Oracle Solaris 11, so we thought it was time to check in and let you know how things are going. On April 25th, at 9:00 PT, we'll host an online forum, featuring Markus Flierl, the VP for Solaris core engineering, as well as engineers, customers and partners. During the forum, Markus and his crew will give an update on the release, recap Oracle's OS strategy, and give you a peek at what the engineers are working on for future updates. I think one of the more interesting parts of this event will be the chance for some of our customers to share why they've moved to Oracle Solaris 11 and what benefits it has already given them.  We'll also have an online chat, so you can ask Solaris engineers any questions about what you've heard, or other thoughts you've had.  It should be a worthwhile event -- hope you can join us. Online Forum: Oracle Solaris 11: What’s New Since the LaunchApril 25th 9:00 a.m. PDT – 11:30 a.m. PDTRegister today!

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• Why I LOVE Dell

  - by Robert May

  We recently ordered a laptop for an employee.  It was delivered yesterday and we realized it had no web cam and wasn’t the 1080p resolution.  He wasn’t happy. So, this morning, I sent an e-mail to our rep and asked him what we could do.  Within an hour or two, he called me, arranged a replacement laptop with the corrected specs, set up a return and had everything arranged and charged us only for the difference.  No pain, no silly questions.  We won’t loose use of the laptop either.  The return and the new laptop will overlap so that we can just pack up the old laptop in the box of the new one, slap some labels on and away we go. This has been my experience with Dell over the past 10 years.  Their corporate service has always been fantastic, and it’s made me a huge fan.  Keep up the good work, Dell! Technorati Tags: Dell

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• Options for secure git -repo hosting?

  - by hhh

  I need a secure git -repo host, either by third-party or by myself. I am not sure how so outlining some ideas. Please, answer how you manage git -repos securely -- do you use some service or do you use only your 'legs' -approach? Afaik Bitbucket.org and Github.com are missing Gmail -style second-verification. Now I need this kind of login-system with password and mobile-phone to access the administration things in the git -hosting or ability to disable this kind of access without private -key. Host it oneself (not sure about details) other? Perhaps related http://stackoverflow.com/questions/11007679/how-can-i-host-git-repositories-and-manage-my-content-hosting-myself

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• Checking whether the user input is a str in Python [migrated]

  - by Sahil Babbar

  I checked various questions on Stack Overflow but one thing every logic lacks. Let me demonstrate using Python: while True: user_input = raw_input() if type(user_input) == str: print 'ERROR' else: print 'BINGO' Also, we cannot use input() in place of raw_input() as it gives the error:Traceback (most recent call last): File ".\test.py", line 3, in <module> user_input = int(input()) File "<string>", line 1, in <module> NameError: name 'asdf' is not defined The problem here is that raw_input converts the user input into string so it always prints 'ERROR' and if I change the second line to user_input = int(raw_input) then, it gives an error: Traceback (most recent call last): File ".\test.py", line 3, in <module> user_input = int(raw_input()) ValueError: invalid literal for int() with base 10: 'asdf' I tried this with try and except but it shall work fine to check integer but not a string. I feel that this question may be marked as a duplicate but I think that this query is important, if logically taken.

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• Windows Phone 8 detected as mass storage

  - by legends2k

  From version 8 onwards Windows Phone supports MTP (media transfer protocol) to transfer audio and I thought I could use Rhythmbox to upload music onto my device. Thing is Rhythmbox doesn't display the device under Devices pane (there's no Device pane for that matter). I searched other questions here and tried out installing mtp-tools, mtpfs and also tried gMTP, which doesn't seem to detect the device as a portable player. I see that the device's icon looks like a Camera in dash bar and when I see the address location, it shows gphoto2://[usb:002,013]/, which makes me doubt that it's detected as a camera or as a mass storage device. /.gvfs/gphoto2 mount on usb%3A002,003 is where the actual mount is. What do I do to fix this? I tried creating .is_audio_player too.

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• Question about server usage, big community platform

  - by Json

  I’m working on a community platform writen in PHP, MySQL. I have some questions about the server usage maybe someone can help me out. The community is based on JQuery with many ajax requests to update content. It makes 5 - 10 AJAX(Json, GET, POST) requests every 5 seconds, the requests fetch user data like user notifications and messages by doing mySQL queries. I wonder how a server will handle this when there are for more than 5000 users online. Then it will be 50.000 requests every 5 seconds, what kind of server you need to handle this? Or maybe even more, when there are 15.000 users online, 150.000 requests every 5 seconds. My webserver have the following specs. Xeon Quad 2048MB 5000GB traffic Will it be good enough, and for how many users? Anyone can help me out or know where to find such information, like make a calculation?

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• How do I increase the touchpad sensitivity on Acer Aspire One 532h?

  - by Yossi Farjoun

  I got a cheap netbook and put ubuntu on it without even booting into the windows it came with. I am now slightly regretting it since the trackpad is very annoying, it only registers when I press quite hard on it, and even then the motion is so slow that I must drag me poor finger 3 times to get the pointer to move up or down that tiny screen. OK. enough rant. now business: I went into the setting and increase sensitivity and acceleration to high. No difference. the behaviour did not change at all. So now my questions are: Is this a hardware problem? Is there a program I can run to see what input the trackpad is receiving? so I know if it can, in theory, read the light touch and not only the heavy, sandpaper-your-fingertips-off touch? is there some manual setting that the system might not be setting correctly and which I could change from the terminal?

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• How to change the default desktop environment?

  - by Kshitiz Sharma

  I wanted to try out different desktop environments so I installed XFCE, KDE, GNOME, etc on top of Unity in Ubuntu 12.04 After a while I decided that I didn't like those other DEs and would stick to Unity. So I changed my default DE to Unity by configuring gdm. > sudo dpkg-reconfigure gdm Now I am able to choose my DE at login time and all of DEs are working properly. But the strange thing is that my boot up screen says 'lubuntu', my login screen is KDE, and my desktop is Unity. How and why is this happening? Why didn't my gdm configuration have any effect? Does login and boot up screen need to be configured separately from the DE? There are other similar questions here but they are not the same as this one. I do not want to remove the other enviroments I'm quite happy with having a list of DEs to select from. I want to know how to set proper defaults.

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• AGPL License - does it apply in this scenario?

  - by user1645310

  There is an AGPLv3 based software (Client) that makes web service calls (using SOAP) to another software (Server - commercial, cloud based). There is no common code or any connection whatsoever between these two except for the web service calls being made. My questions - Does the Server need to be AGPL too? I guess not - but would like to confirm. Let us say the end point URL for the Server can be configured on the Client side (by editing an XML file) to connect it to different Servers (again, there is no connection other than the webservice calls being made) does it require any of these Servers being AGPL? Are there any issues in running the Client as a DLL that is loaded by other commercial applications on users' desktops? Does it require these other applications also to be AGPL?

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• When do one give up on programming challenges to look at the solutions?

  - by snowpolar

  Recently, I have been trying to learn programming and improve my ability in writing method level code through practices on websites such as Codingbat.com However in the recent weeks I have been stuck for weeks at the last 2-3 questions of String-2/Array-2 and early String/Array-3 problems. It feels really tempting for me to give up and google online for the solutions, but I'm afraid that by doing so I may end up not improving my ability at all. I wonder if this is common and when faced with such situations how long do 1 wait before giving up to look at the solutions or to continue spending more weeks on trying to solve the problems by yourself? How do 1 really engage in effective deliberate practice to improve programming ability and attain the necessary problem solving techniques? Any formal techniques available to tackle the never seen before problems?

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• Turning my mobile boardband into Wifi with my laptop using Kubuntu 12.04 to use it in my desktop PC

  - by Suhail cholassery

  Its been 3 or 4 months since I started using 12.04. What I want to do is very clear: Turn my mobile broadband connection into Wifi connection with my laptop using Kubuntu 12.04 to use it in my desktop PC. I browsed through most of the questions related to this (ad- hoc connections, bridging mobile broadband with Wifi, etc). I also read the ICS article, but I found those too difficult to digest. I hope that there is some other way to do this. I request you to give me a practical and applicable answer . I am not trying duplicate any other existing question.

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• Launcher disappears when Focuswriter is minimized

  - by Andreas

  This bug has to do with the integration of the full-screen writing app Focuswriter within Unity. It appeared before I upgraded from Ubuntu 12.04 to 12.10 - probably caused by a an automatically upgraded change that persist in 12.10: When I minimize Focuswriter after it has been in full-screen mode the launcher is invisible - instead of seeing it I just see a rectangle the color of my desktop background where it should have been. The launcher becomes visible if I click the area once but then I'm likely to hit an icon and unwillingly open a program. I've reported the bug to the developer of the program here: https://github.com/gottcode/focuswriter/issues/101 He has labeled the bug "upstream" saying that the bug is can only be fixed in Unity. My questions are: 1) does anyone (perhaps experiencing problems with other full-screen programs) have a solution or workaround so the launcher won't disappear? 2) where can I file a bug report for this problem?

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• Write data to SQL Server directly from BizTalk or use external service?

  - by dlongest

  An external source will be sending us XML data that BizTalk will pick up and transform into an internal schema. We need this data to be loaded into a SQL Server database as we're going to expose some of the data to our web front-end via a custom WCF service. The question is: what is the recommended approach for doing something like this? Options we're considering are having BizTalk write to the database directly or having BizTalk call a custom WCF service which would handle the save operation. Another briefly considered idea was having BizTalk write to an MSMQ and have a custom service pull from there and store it in the database. What are some of the guidelines or questions that should be asked in assessing these options? There are concerns related to overhead from calling the extra service, duplication of efforts if the schema is modified in the future (which it will be to some extent), and simply the best way to design within a service-oriented architecture that we're struggling with.

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• 12.04 server on home network

  - by dustin mantei

  I need advice to help me with a server install, I'm new to ubuntu and linux in general. I have 6 systems in my house, 5 being windows 7 and this laptop that I am typing on is Linux mint 13 Maya. Question is, my wife will not transition to anything. She is stuck in Gates-land. so, can I make a server with ubuntu 12.04 (burnt disc image last night) so that all systems in my home can access and my mother-in-law in another state can also access with a username? That would be awesome and it may convince the war dept (my wife) to change all the systems in my house to ubuntu/linux. Sorry this is so long winded, but all the questions I have seen on this forum don't answer it completely.

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• Need a really simple client manage script to deliver graphics and revisions, please help?

  - by Mark R

  I am looking for a very simple client management script. The process flow of the script should be: Client orders (paypal etc) while giving specs on what they need given login details and thanked for their order backend for them consists of a 2 way communication. They ask questions we answer. We also upload the graphics here where they either accept them or as for revision. process complete. Now I cannot for the life of me find something as simple as this. It seems all the scripts out there are way too complicated. Does anyone know of one I can use to do this?

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• Coding events. What they actually are about, and are they worth it?

  - by BKC

  I'm a relatively new programmer, but am very much interested in it. I enrolled to this coding event (Yahoo! Hack India, to be precise), and got invited after the pre-coding contest. The event is like a contest where developers create an application in 24 hours, In group or individually. I've never been to such an event before, and certainly don't know anyone who did. So, here are my questions. First of all, is it worth it? What if we don't get any ideas in the first place to start with? I'm not actually a developer, I'm an electrical engineering student who just completed his 2nd semester. So will be able to match up to the level of other developers who will be there? Any other advice/suggestions Thank you in advance.

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• No proper kmeans clustering of images in matlab

  - by user3237134

  I am having 1200 face images in my training set.There are 2989 test face images. I am using eigen faces (PCA) for feature extraction. I am using kmeans clustering. Source code I tried: IDX = kmeans(z,5); clustercount=accumarray(IDX, ones(size(IDX))); disp(clustercount); Problem: Images are not clustered properly. Same faces should be clustered. But different faces are being clustered. Questions: Should I have to use still more face images for training? How accuracy of clustering can be achieved? What is the solution?

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• How do you deal with the details when reading code?

  - by upton

  After reading some projects, I find that it is not the architecture of the software that is really hard to know. It is not hard to figure out the architecture immediately if the project is clearly designed and implemented, if it's hard and never seen before, some day later I can find out some pattern similar to the one I read in the same domain. The difficulty is that the concepts and mechanism defined by the author are really hard to guess, and these concepts may spread in the whole project which makes it hard to grasp. The situation is normal and universal and you can ask questions to your colleague when in a company. However, it gets worse if nobody around you knows these details. How do you handle these details which block your reading?

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• Why do recruiters contact you instead of the companies themselves? [closed]

  - by Chloe

  When posting my resume, I get hounded by recruiters who try to sell me on a job. Why don't the actual company HR employees contact me directly? My information is available for them to find. Wouldn't they save money by bypassing the recruiter fees? Out of the hundreds of recruiter phone calls, only 2 actual companies contacted me directly (and 2-3 other non-company individuals). Should the HR employees be let go if they are so irrelevant? (The careers exchange doesn't allow posting questions.)

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• Theme changes after resuming from suspend

  - by mouche

  I'm using a Dell Inspiron 1520 and Ubuntu 10.10. I've read a lot of questions about graphics problems after resuming from suspend, but most of them are much more serious than mine. I can boot, login and use Ubuntu fine. The problem is that my theme for my top bar and bottom bar changes to gray and blocky (not rounded). Oddly enough, the theme for the title bars of my windows stay the same dark theme. Any ideas how I can fix this? It works fine if I logout and log back in.

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• PeopleTools 8.54 Pre-Release Notes Available

  - by Matthew Haavisto

  PeopleSoft's PeopleTools recently published pre-release notes for PeopleTools 8.54.  Pre-release notes provide more functional and technical details than the release value proposition. This document describes how enhancements function within the context of the greater business process. This added level of detail should enable project teams to answer the following questions: What delivered functionality will change? How will an upgrade or new implementation affect other systems? How will these changes affect the organization? After the project team has reviewed and analyzed the pre-release notes, business decision makers should be able to determine whether to allocate budget and initiate implementation plans. This document covers the following subjects: Platform support enhancements Development tools enhancements System administration tools enhancements Reporting and analytic tools enhancements Integration tools enhancements Lifecycle management tools enhancements Accessibility PeopleSoft Interaction Hub enhancements.

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• What If I Don't Get An Exam Results Email Alert?

  - by Brandye Barrington

  Exam results are available directly from Oracle's certification portal, CertView. This requires candidates to authenticate their CertView accounts before being able to access their exam results. The Oracle Certification team has developed a series of videos to help candidates through this process.  YOUR QUESTIONS ANSWERED FAQ: Receiving Exam Scores FAQ: How Do I Log Into CertView? FAQ: How To Get Exam Results FAQ: Accessing Exam Results in CertView FAQ: How Will I Know When My Exam Results Are Available? FAQ: How To Download and Print Exam Score Reports FAQ: What If I Think My Exam Results Are Wrong In CertView? FAQ: Is Oracle Changing The Way That Exams Are Scored?

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