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  • Avoiding orbiting in pursuit steering behavior

    - by bobobobo
    I have a missile that does pursuit behavior to track (and try and impact) its (stationary) target. It works fine as long as you are not strafing when you launch the missile. If you are strafing, the missile tends to orbit its target. I fixed this by accelerating tangentially to the target first, killing the tangential component of the velocity first, then beelining for the target. So I accelerate in -vT until vT is nearly 0. Then accelerate in the direction of vN. While that works, I'm looking for a more elegant solution where the missile is able to impact the target without explicitly killing the tangential component first.

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  • If you should only have one assertion per test; how to test multiple inputs?

    - by speg
    I'm trying to build up some test cases, and have read that you should try and limit the number of assertions per test case. So my question is, what is the best way to go about testing a function w/ multiple inputs. For example, I have a function that parses a string from the user and returns the number of minutes. The string can be in the form "5w6h2d1m", where w, h, d, m correspond to the number of weeks, hours, days, and minutes. If I wanted to follow the '1 assertion per test rule' I'd have to make multiple tests for each variation of input? That seems silly so instead I just have something like: self.assertEqual(parse_date('5m'), 5) self.assertEqual(parse_date('5h'), 300) self.assertEqual(parse_date('5d') ,7200) self.assertEqual(parse_date('1d4h20m'), 1700) In the one test case. Is there a better way?

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  • Lubuntu 14.04 Problem starting lxsession-default-apps

    - by user278179
    I have one problem, I can't execute lxsession-default-apps on Lubuntu 14.04 because I get because said to me "The database is updating, please wait" If I try to run lxsession-default-apps, I get this error: ** Message: utils.vala:30: config_path_directory: /home/USER/.config/lxsession-default-apps ** Message: desktop-files-backend.vala:171: test config_path: /home/USER/.config/lxsession-default-apps/settings.conf ** Message: desktop-files-backend.vala:237: Scanning folder: /usr/share/applications ** Message: desktop-files-backend.vala:278: Start scanning ** Message: desktop-files-backend.vala:257: Scanning folder: /usr/share/app-install/desktop ** Message: desktop-files-backend.vala:278: Start scanning Error: list_files failed: No such file or directory ** Message: desktop-files-backend.vala:333: Finishing scanning ** Message: desktop-files-backend.vala:189: Signal finish scanning with mode: write ** Message: desktop-files-backend.vala:333: Finishing scanning Any help would be appreciated. Thanks. Regards.

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  • How do I install penmountlpc?

    - by ændrük
    I would like to install the penmountlpc touchscreen driver in Ubuntu 11.10 on a Dialogue Flybook A33i. When I try installing it from the source packed in penmountlpc-source_1.1_all.deb, I receive the following build error (see also the full build log): # Install the module cp penmountlpc.o debian/penmountlpc-modules-3.0.0-12-generic/lib/modules/3.0.0-12-generic/misc cp: cannot create regular file `debian/penmountlpc-modules-3.0.0-12-generic/lib/modules/3.0.0-12-generic/misc': No such file or directory make[1]: *** [binary-modules] Error 1 make[1]: Leaving directory `/usr/src/modules/penmountlpc' make: *** [kdist_build] Error 2 How can I resolve this problem?

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  • replacing kernel on non-booting ec2 instance

    - by TheToolBox
    So I had an amazon ec2 instance crash during the update to 14.04LTS. Frustratingly, it appears the kernel might be bad (or at least that's what the log below says to me, I could totally be wrong). I'm able to mount the volume to another, working server, chroot the broken volume, and sudo apt-get remove linux-headers-3.MOSTRECENT. Unfortunately though, when I try sudo update-grub, it comes back with /usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?). What am I missing? Here's the log from the server's attempted bootup: [H[J Booting 'Ubuntu 14.04 LTS, memtest86+' root (hd0) Filesystem type is ext2fs, using whole disk kernel /boot/memtest86+.bin ============= Init TPM Front ================ Tpmfront:Error Unable to read device/vtpm/0/backend-id during tpmfront initialization! error = ENOENT Tpmfront:Info Shutting down tpmfront xc: error: panic: xc_dom_core.c:621: xc_dom_find_loader: no loader found: Invalid kernel xc_dom_parse_image returned -1 close(3) Error 9: Unknown boot failure Press any key to continue... Thanks in advance!

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  • Virtual hosting

    - by H3llGhost
    Hello, I want to use domains like xxx.abc.domain.tld. The xxx is my folder to access. I tried it with the rewrite rules, but I can't get it working, because I don't know how to get the part xxx from the SERVER_NAME into my RewriteRule. This was my try: UseCanonicalName Off # include the IP address in the logs so they may be split LogFormat "%A %h %l %u %t \"%r\" %s %b" vcommon CustomLog /var/log/apache2/vaccess.log vcommon RewriteEngine On # a ServerName derived from a Host: header may be any case at all RewriteMap lowercase int:tolower ## deal with normal documents first: # do the magic RewriteCond ${lowercase:%{SERVER_NAME}} ^.+\.abc\.domain\.tld$ RewriteRule ^(.*)$ /var/www/abc.domain.tld/[xxx-part]/$1 [L] Perhaps there is a better solution. In generally I want to create a dynamic login system with mod_auth_mysql and for each xxx is a seperate user database. I would prefer the domain/address syntax abc.domain.tld/xxx, but I don't know how to realize it. Thanks for any advices.

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  • Webcast Replay: Extreme Performance for Consolidated Workloads with Oracle Exadata

    - by kimberly.billings
    If you missed our live webcast Extreme Performance for Consolidated Workloads with Oracle Exadata last week, the replay is now available. Watch the free on-demand webcast in which Tim Shetler, Vice President of Oracle Database Product Management, and Richard Exley, Consulting Member of Technical Staff, discuss how Oracle Exadata can help you can significantly improve application performance and reduce infrastructure costs by consolidating transaction processing, data warehousing, or mixed workloads on Oracle Exadata. Note: (1) Turn off pop-up blockers if the slides do not advance automatically. (2) Slides are available for download. var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www."); document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); try { var pageTracker = _gat._getTracker("UA-13185312-1"); pageTracker._trackPageview(); } catch(err) {}

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  • VMWare Player pauses often

    - by pascal
    I'm using a 64bit Windows 8 inside vmplayer, with 2 virtual processor cores, virtual hard disk resides on a fast local disc and is not preallocated; host CPU is Intel i7 3770, should be capable of hardware virtualisation but I don't know if VMWare uses it; NAT networking; Sound card connected, USB connected, accelerated 3D graphics (NVidia 313.30 on host) My problem is, that the VM often pauses for a few seconds, and then speeds up for a few seconds to reach real time again. Time in the VM actually moves faster after the pause, for example all animations using timers speed up. When running, the vmware-vmx process shows ~150% CPU usage in top, but 0% when pausing (and D state i.e. waiting for IO). iotop shows normal disk writes from vmware-vmx threads, but during pauses, the flush kernel thread uses 99%. Are there some options to try so that VMWare doesn't wait for IO? I've tried a few things available from the GUI but the issue never went away…

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  • NetBeans "Find Usages" Tool Integrates JSF Expression Language

    - by Geertjan
    I saw this by Adam on Twitter today: Interesting. Let's try it. Here's my method "getCustomerId". I select it, right-click, and choose "Find Usages" (or press Alt-F7): A nice dialog appears: Then click "Find" and, guess what, this is what I see (click to enlarge it): Clearly, as you can see, I'm not only finding the Java controller class where the getter is used, but also the Facelets files, and, within those, the exact lines where the JSF expression language makes use of the getter. This is not a new feature, tried it and got the same result in 7.1.1, but it's really cool to know about nonetheless.

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  • Error : Could not display "obex://" when paired with a Nokia 3110c

    - by MobileDev123
    Hi, I have paired my nokia 3110c via bt on my pc, I can receive a file from my pc to the phone, but I can not browse the contents of phone from my computer. Here is the error message Error: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken. Please select another viewer and try again. How can I transfer contents from my phone to my computer?

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  • Upload Recordings Of The Problem To Your SR

    - by jhpierce
    Do you find yourself trying several times to explain a problem in a Service Request? Does the support engineer ask more than once for clarification? If so, you might be interested in DITO -- Demo It To Oracle. DITO uses CamStudio (free download!) to record the exact nature of the problem, and upload the output to your SR. The following articles provide more details: Working with Support - MOSSOS (Doc ID 1265130.1) "Demo It To Oracle" (DITO) - CamStudio Help ( Doc ID 11.1) Why take up valuable time first explaining the problem, then trying to get a web conference setup to show exactly what is going on? The next time you file an SR, try including a recording showing exactly which application is failing, where it is failing, and what it looks like when it fails.

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  • How to learn an API

    - by inovaovao
    When I find some interesting project (e.g. on GitHub) I often would like to use it and try it out to see how it works, but if there isn't a good documentation or some kind of tutorial it's hard to figure out how to use it. So my question is: how do you approach such a situation? How do you figure out which classes are important and how to chain them to put them to use? What would you look at first? An advice I found is to look at the tests (if there are any). But if there are unit tests for every class, how do you know which ones to look at first?

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  • How do I install Ubuntu to a USB key?

    - by badp
    If you are hurrying to reply, System ? Administration ? StartUp Disk Creator -- no, that's not what I'm talking about. I want to try Ubuntu 11.04's Unity without touching my existing Ubuntu install. To do this, I need to install the nVidia drivers first (sigh). To do this, I need changes to persist a reboot. To do this, I need to really install Ubuntu on a USB key. How do you do that? What I tried I tried to make a USB key from Testdrive, then boot from it, then choose "Install Ubuntu." The installer refused to install to the installation media itself. I tried, from my installed copy of Ubuntu: sudo kvm /dev/sdb --cdrom .cache/testdrive/iso/ubuntu_natty-desktop-i386.iso ...but the installer didn't detect the disk properly.

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  • Is there any way to prevent Googlebar from breaking Friendly 404s

    - by TecBrat
    This might be considered a continuation of this question. If I output HTML after my 404 header, It displays properly in IE and FF unless the user has Google bar instaled. If I try header('HTTP/1.x 404 Not Found'); header("Location: http://www.example.com/?content=404_error"); die(); then I'm getting 302 from the redirect. It seems to overrule the 404 Supposedly if your output is larger than 512 bytes, the toolbar isn't supposed to override the page, but It seems to do it anyway. I found a setting in Google's Toolbar that said "Provide suggestions on navigation errors". Turning that off provides me with the behaviour I want my visitors to experience. Does anyone know if Google provides a way for a developer to over-ride that setting for all visitors?

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  • Backtrack 5 R2 Dual-Boot w/Windows 7 No Longer Loads

    - by dstars5
    A while back, I installed Backtrack 5 R2 to Dual Boot on a Windows 7 PC. It worked fine for a while, but now when I try to load it, the screen gets all messed up (tried to get a picture with my phone, but it wasn't working too well). The last line before it freezes says: fb: conflicting fb hw usage: nouveaufb vs VESA VGA - removing generic driver Since it last worked, the only changes I can think of are that the computer is now connected via ethernet cable to the router, and I upgraded the graphics card (to nvidia). Because of the last line, I personally would put my money on the latter, but I still have no clue how to fix this. Can someone help me? Thanks!

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  • apt-get not recognizing downloaded archives

    - by meteors
    I installed Ubuntu Gnome 13.10. I previously had Ubuntu Gnome 13.04 and had all the archives in the /var/cache/apt/archives/ stored to a removable disk. After installing 13.10 I copied all my archives to the above mentioned path. When I run apt-get install it tries to fetch the archives although I have the archives. Also if instead of apt-get install if I try to install individual .deb files using dpkg -i everything runs fine. These are the permissions of files: How do I fix this. Previously copying archives like this worked fine and downloading duplicates the files.

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  • Unable to mount location, Can't mount file

    - by user116008
    I'm a new user to Ubuntu and I have a problem: I had Windows XP in my computer and I had two partitions: C (for system data) and D(for my personal stuff), then, during the Ubuntu installation I chose the Advanced Settings and formated C partition and left D partition intact, went back and chose Install Ubuntu and replace Windows and it installed fine. The problem is that now I open Nautilus and go to Computer, in there it shows my D partition, 640 Hard Disk, but when I try to mount it displays me a message: "Unable to mount location. Can't mount file". I ask you to explain me step-by-step what I need to do because I'm not an advanced user. My computer specs: 2 GiB RAM, Proccesor Pentium(R) Dual-Core CPU E5400 @ 2.70GHz × 2, Graphics Unknow (It's Nvidia GeForce 220 {1GB} or something), OS type 32-bit, Disk 628.0 GB P.S.: My HDD is internal, I'm not using external Hard Drives. Thank You!!! Mike

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  • How to print with PYGTK on quickly

    - by user88476
    I am trying to make a program that can open save and print texts with Quickly, but I can't get the printing part to work. In my code when you press the "printbutton" it opens a print dialog: def on_printbutton_clicked(self,widget): self.printdialog.show() and that works fine. And when you click "ok" it will gather the settings from the dialog and try to print: def on_printdialog_response(self,widget,ok): printjob = gtkunixprint.PrintJob(self.filename,self.printdialog.get_selected_printer,self.printdialog.get_setting,self.printdialog.get_page_setup) but when I run it doesn't work and just gives me this: NameError: global name 'gtkunixprint' is not defined Is "gtkunixprint" wrong? Or is it something else in my code? Or should I first import something? I hope you can help me.

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  • What are the technial and programming requirements for writing a stealth keylogger?

    - by user970533
    I'm planning to write/code one such stealth keylogger that would bypass detection by a certain antivirus. (I don't want to name the vendor as I know how good Google queries are against StackExchange websites). I don't want to just download any keylogger from internet and try to encode it to evade detection. Writing code myself I would have the ability to make changes as I go; obscuration on both high-level and low-level language. I like control too. It seems naive but is it true that keyloggers are a thing of the past, probably because of how effective AV's have become in detecting such programs? I want some nice points on how can one easily write a robust, effective key logger preferably for a Windows environment?

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  • Mozilla Firefox 23 Will Block Mixed SSL Content

    - by Anirudha
    Originally posted on: http://geekswithblogs.net/anirugu/archive/2013/07/03/mozilla-firefox-23-will-block-mixed-ssl-content.aspxIf you have a site which is running on SSL and used content that make non-https request then you need to a bit worried. The default setting of Firefox 23 will block the content that called on non-https address and page is based on SSL. for example script using https://code.jquery.com/jquery-1.10.2.min.js will not work because code.jquery.com can not be reach on https. the cdn ajax.googleapis.com support SSL so you can try it. if you want to disable this settings you can modify it on about:config security.mixed_content.block_active_content change the value true to false and it will be disable (it’s just for example)

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  • Troubleshooting Windows 7 HomeGroup

    p The HomeGroup feature in Windows 7 is a great tool to use if you want to easily share files or printers with other Windows 7 computers on your home network. Setting up a HomeGroup definitely has its perks but as with anything there are times when you could run into trouble. When you consider the fact that you are sharing files or printers across different computers the likelihood of having to troubleshoot your HomeGroup seems to increase. Here are some tips to use if you find that your Windows 7 HomeGroup is not functioning as it should. p ... ALM Software Solution ? Try it live! Requirements Management, Project Planning, Implementation Tracking & QA Testing.

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  • Is avoiding the private access specifier in PHP justified?

    - by Tifa
    I come from a Java background and I have been working with PHP for almost a year now. I have worked with WordPress, Zend and currently I'm using CakePHP. I was going through Cake's lib and I couldn't help notice that Cake goes a long way avoiding the "private" access specifier. Cake says Try to avoid private methods or variables, though, in favor of protected ones. The latter can be accessed or modified by subclasses, whereas private ones prevent extension or re-use. in this tutorial. Why does Cake overly shun the "private" access specifier while good OO design encourages its use i.e to apply the most restrictive visibility for a class member that is not intended to be part of its exported API? I'm willing to believe that "private" functions are difficult test, but is rest of the convention justified outside Cake? or perhaps it's just a Cake convention of OO design geared towards extensibility at the expense of being a stickler for stringent (or traditional?) OO design?

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  • Problems using PHP on a Plesk Windows dedicated server

    - by wpsmdouble
    I'm having a few issues with my dedicated Windows server that has a Plesk panel: 1.) I can't send e-mail via PHP's mail() function, it always returns the following error: SMTP server response: 550 Requested action not taken: mailbox unavailable or not local Which setting should I alter in order to enable sending mail? 2.) The exec() and passthru() PHP functions don't work; their outputs are blank even when I try to run simple commands such as dir. Is there an option that I can toggle in the control panel to enable this functionality?

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  • Isometric tile range aquisition

    - by Steve
    I'm putting together an isometric engine and need to cull the tiles that aren't in the camera's current view. My tile coordinates go from left to right on the X and top to bottom on the Y with (0,0) being the top left corner. If I have access to say the top left, top right, bot left and bot right corner coordinates, is there a formula or something I could use to determine which tiles fall in range? I've linked a picture of the layout of the tiles for reference. If there isn't one, or there's a better way to determine which tiles are on screen and which to cull, I'm all ears and am grateful for any ideas. I've got a few other methods I may be able to try such as checking the position of the tile against a rectangle. I pretty much just need something quick. Thanks for giving this a read =)

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  • Load old kernel module while keeping current

    - by legion
    So I was wondering if there is anyway that I would be able to load an old iwlwifi from a 2.6 kernel while still using the 3.2 kernel and if there was a guide to doing so? I need to be able to do so because my wireless card is.... well the new kernels have broken all support for my card, which is a Intel Ultimate-N 6300. I'm extremely upset with how badly they broke support for this card to the point where I can't connect to any router that isn't wifi N enabled and even then only a select few routers work, it amazes me as to how awful it is and whats more amazing is how well it worked in 2.6 kernels. I've tried all the work arounds that have been discussed to try and fix this, and the only thing I have found that works is running a 2.6 kernel. However I would like to be able to keep my 3.2 kernel and just load up an old version of iwlwifi that actually supports it, is there anyway to do this?

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