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• How do I learn to develop financial software?

  - by Jack Smartie

  I would like to know what I have to learn to become a financial software developer in the area of brokerage/investment software. I apologize if this question is off topic. I'm not sure where to put it. What programming language(s) is most commonly used in the financial world? Financial software requires highly accurate and redundant features. Are these programming skills learned through experience, a class, or a book?

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• How can I get run Ubuntu Desktop on my Galaxy Nexus?

  - by Jack Senechal

  On the Ubuntu for phones site it advertises the desktop view feature: "The phone becomes a full PC and thin client when docked.". And there's the demo by Canonical of something similar running under Ubuntu for Android. I realize they're different systems, but the end effect is in both is to have a full Ubuntu system running on the phone. I've installed Ubuntu Touch Preview on my Galaxy Nexus (toro), and it's working as expected (no cellular signal, but wifi works, etc). But when I plug in a monitor via HDMI it just mirrors the phone's touch display. There's also currently no bluetooth support for attaching keyboard and mouse. Keyboard only kind of works via USB, and mouse not at all. I've also tried running Ubuntu under Android via VNC, but the lack of responsiveness of VNC makes it impractical for daily use. I'd consider that route again if there is some way to make the UI more responsive. So the question is, how can set up my phone to run Ubuntu Desktop in a way that's useable as a laptop replacement? Is there a way to enable Desktop View on Ubuntu Touch? Or can I run Ubuntu for Android as in the previously referenced demo? Plugging into a monitor would be OK, but I'd love to be able to use the desktop interface with mouse and keyboard through the phone's screen as well. Touch input and an onscreen keyboard would be a plus but is definitely not necessary.

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• Does anyone know any good resources for learning how to market a web app?

  - by Jack Kinsella

  I'm a developer first and foremost. I write web apps but have a hard time generating traffic and converting potential users once I've released my product into the wild. I know I need to learn more about marketing but I don't know where to start as I've no baseline to judge the quality of the materials I stumble across. Does anyone know any websites, blogs, e-books or other resources for learning how to market effectively?

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• Use Outlook password for website verification

  - by Jack Lockyer

  I am currently building an internal employee dashboard for our global company (it is hosted on an external website for logistical reasons) I'd like (need) to password protect the page as we will be displaying sensitive information, my question is, is it possible to integrate with Outlook passwords? We have over 350 staff all of whom use outlook on a daily basis, I'd love for the website to check whether the visitor is logged into Outlook and if they're not, prompt them to log in. Is it possible?? If it is I'll get is developed straight away.

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• Which ATI driver version did 10.04 use?

  - by Jack

  I have a trouble with ATI driver with Ubuntu 12.04 LTS. When I install ATI driver in Ubuntu 12.04 via "Additional Driver", then I can't shutdown Ubuntu, it showed blank (black) screen and my laptop still run. Sometimes, my screen like that: http://www.youtube.com/watch?v=U9_iygesbBM But when I install Ubuntu 10.04 and install ATI driver via "Additional Driver", it's very good and no trouble I've seen. It's sweet but 10.04 is old and is supported to 4/2013. So I want to know why Ubuntu 10.04 works good better than 12.04 with ATI driver (in my case)?

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• Remove unwanted Mount option from Places Menu

  - by Jack

  On Ubuntu 10.10, I added a CIFS network share into /etc/fstab using /media/pub as my mount point. The share becomes visible on the Desktop and under Places (drive icon), which is what I want. But the problem is, Ubuntu 10.10 (unlike 10.04) creates another entry under Places with same name "pub", except this appears to be a mount shortcut rather than another link to the share. When I move my mouse over it says "Mount pub" and if I click on it, it will mount the share and again each time (if already mounted) - it does not display contents of share. In either case, an error pops up soon after "Unable to mount pub - Timeout waiting for mount to appear". The share itself is accessible, but I can't unmount via GUI, system reports its mounted multiple times and I have to unmount via terminal. (sudo umount -a) As I'm mounting the share at boot time, I don't need this manual option under Places. Is there an easy way to stop Ubuntu from listing it under Places? I have tried making the mount point under /mnt, this fixes the problem, except creates another as it removes the drive icon from Desktop and Places. I could create a bookmark, but just wondered if there's an easy fix to this unwanted entry under Places. Thanks

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• Setting APPMENU_DISPLAY_BOTH for gnome applications does not work on Ubuntu 12.04 LTS

  - by Jack'

  To start the application with the menu enabled in the application and the panel, the following command has to be used: APPMENU_DISPLAY_BOTH=1 appname I recently discovered that this only works for non-gnome applications on Ubuntu 12.04 LTS, i.e. if you replace appname with applications such as gnome-terminal, gedit, evince, empathy, evolution, rhythmbox, nautilus, etc. only global menus will be displayed. However, if you start, for example, gimp or inkscape by using APPMENU_DISPLAY_BOTH, both global and local menus will be shown. The questions is: why is APPMENU_DISPLAY_BOTH not taken into account when starting such gnome applications? P.S. I know how to disable global menus in order to get the local ones (UBUNTU_MENUPROXY trick, removing appmenu-gtk/qt packages, removing the indicator-appmenu, etc.) Thanks for the help!

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• Developing a computer system based on Nand2Tetris [on hold]

  - by Ryan

  I recently finished a book called Nand2Tetris (nand2tetris.org) where I built my own computer system from scratch with its own machine language, assembly code, and a high level language called Jack that's translated to Hack binary. However, I feel like the "computer" I built throughout the course of this book (called the Hack computer) is a bit too simple for various reasons: 1) There are only two registers (D and A), whereas most computers have much more 2) Peripheral devices like mouse and keyboard have to be directly implemented 3) Peripheral devices use a pre-planned shared memory map to communicate with the CPU instead of using interrupts (which aren't covered at all) 4) Jack (the high level language) code doesn't compile to Assembly code directly, instead it compiles to an intermediate language, which in turn gets translated to Assembly. 5) There is no ROM or permanent storage device, everything is stored in RAM 6) No support for colored monitor, networking or sound I would like to build a more complicated computer system now based on what I've learned from Nand2Tetris. Does anyone know of any good resources or books to get started on this? (BTW by computer system I mean software that can emulate the hardware of a virtual computer with its own unique instruction set)

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• How much to charge for Wordpress installation?

  - by Jack Duluoz

  I know this isn't properly a technical question but I hope this is ok here. The question is simple: how much should I charge a customer for a Wordpress installation & configuration? Configuration simply means I have to install him a theme (which is not provided by me), various plugins and maybe edit some lines of code here and there to make the whole thing work fine. MORE INFO I don't do this for a living, I'm just doing this for this single customer. He told me he wants to customize some features of the blog which I think will require a bit of code editing, but these will be small modifications, because I already told him that more substantial modifications will be billed separately. I don't know exactly how long will this take, but probably just 1 day for the setup and some more days to adapt the blog to the customer requests which will eventually come up later

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• 2D camera perspective projection from 3D coordinates -- HOW?

  - by Jack

  I am developing a camera for a 2D game with a top-down view that has depth. It's almost a 3D camera. Basically, every object has a Z even though it is in 2D, and similarly to parallax layers their position, scale and rotation speed vary based on their Z. I guess this would be a perspective projection. But I am having trouble converting the objects' 3D coordinates into the 2D space of the screen so that everything has correct perspective and scale. I never learned matrices though I did dig the topic a bit today. I tried without using matrices thanks to this article but every attempt gave awkward results. I'm using ActionScript 3 and Flash 11+ (Starling), where the screen coordinates work like this: Left-handed coordinates system illustration I can explain further what I did if you want to help me sort out what's wrong, or you can directly tell me how you would do it properly. In case you prefer the former, read on. These are images showing the formulas I used: upload.wikimedia.org/math/1/c/8/1c89722619b756d05adb4ea38ee6f62b.png upload.wikimedia.org/math/d/4/0/d4069770c68cb8f1aa4b5cfc57e81bc3.png (Sorry new users can't post images, but both are from the wikipedia article linked above, section "Perspective projection". That's where you'll find what all variables mean, too) The long formula is greatly simplified because I believe a normal top-down 2D camera has no X/Y/Z rotation values (correct ?). Then it becomes d = a - c. Still, I can't get it to work. Maybe you could explain what numbers I should put in a(xyz), c(xyz), theta(xyz), and particularly, e(xyz) ? I don't quite get how e is different than c in my case. c.z is also an issue to me. If the Z of the camera's target object is 0, should the camera's Z be something like -600 ? ( = focal length of 600) Whatever I do, it's wrong. I only got it to work when I used arbitrary calculations that "looked" right, like most cameras with parallax layers seem to do, but that's fake! ;) If I want objects to travel between Z layers I might as well do it right. :) Thanks a lot for your help!

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• Which ATI driver version Ubuntu 10.04 LTS used?

  - by Jack

  I have a trouble with ATI driver with Ubuntu 12.04 LTS. When I install ATI driver in Ubuntu 12.04 via "Additional Driver", then I can't shutdown Ubuntu, it showed blank (black) screen and my laptop still run. Sometimes, my screen like that: http://www.youtube.com/watch?v=U9_iygesbBM But when I install Ubuntu 10.04 and install ATI driver via "Additional Driver", it's very good and no trouble I've seen. It's sweet but 10.04 is old and is supported to 4/2013. So I want to know why Ubuntu 10.04 works good better than 12.04 with ATI driver (in my case)?

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• Does anyone know any good resources for learning how to market a web app?

  - by Jack Kinsella

  I'm a developer first and foremost. I write web apps but have a hard time generating traffic and converting potential users once I've released my product into the wild. I know I need to learn more about marketing but I don't know where to start as I've no baseline to judge the quality of the materials I stumble across. Does anyone know any websites, blogs, e-books or other resources for learning how to market effectively?

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• Evolution sending Email Settings

  - by Jack

  Can receive Comcast mail with evolution but cannot send. The SMTP settings record more digits when clicking the Server Configuration apply key. Sending ([email protected]:tenz222) port587 After clicking apply, receive a "Error while sending message" host lookup failed etc When rechecking,the sever settings are, ([email protected]%253atenz222) Attempted this process many times with same result. Now need to be proactive and ask for help. Will phone for help anywhere, anytime in USA. Thanks

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• How to change careers

  - by Jack Black

  For the past 4 years I have worked in c# doing web development. I have really enjoyed it, learnt a lot and have a worked hard to get to a position where I am earning good money and enjoy the work. However lately - I have wanted a change. What with the "native renaissance" I would like to change my career from being high level application and web development to more down to the metal native development. I haven't done any c or c++ since Uni over 4 years ago and so I have begun reading text books and websites to brush up. However - one major issue I have is that I have no practical experience with C++ and although I am brushing up on it, there will be a lot I don't know. Most of the jobs I have seen in native code around me all require native experience. The only positions I can find that don't explicitly ask for native experience are junior level positions. In my current role I am a mid level developer and although there would be a lot to learn in a c++ position, I wouldn't class myself as a junior. I guess my question is, how do people solve this issue when changing programming languages for their profession and / or how would you approach this hurdle? Like I said, I would really like to try out native development professionally but I wouldn't want to move back to a junior role. Would employers consider years of managed development and native hobby projects enough experience?

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• can't get a good install:11.10 server

  - by jack

  I screwed up my partitioning aparently tring to get lvm and raid1 going. the machine is an intel dual core dt with 2 gig of ram and 2 sata drives, one 250g and the other 500g. This a build for my school in n.e. Thailand. we have 20+ clients now, a website, email. Our old server is dying fast and we are going to add another 12 stations next week. I really need some help here! 1. have onboard gigabit ethernet that aparently uses same driver as realtek 811c. I installed a pcie gigabit card also 811c. At several points the eth0 has accessed the internet fine, but the eth1 will not communicate. 2. I saw a "fix" for this online which from root: rmmod r8169. this imediately killed the working onboard card. 3.I tried to re-install 11.10 figuring that would re-install r8169. However I messed something up in my partitioning and can't get a clean boot now. 6. so I think after 12 re-installs or so and 2 days. I can get through it right if I can start over with clean drives, but I can't figure out how to empty them out what with soft raid and lvm partitions. seems like i've had it going well and then trying to fix that one little problem, i go backwards.Please help! please send email.-thanks

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• No sound, even though devices appear OK

  - by Felix

  I have a weird problem. Sound used to work until a couple of days ago, but now the builtin speakers in my ThinkPad W520 have stopped working. This happened after either: An update Using the headphone jack in my laptop dock (I had used the jack in the actual laptop before without issues) As I was saying, the speakers do not work at all. Sometimes I get a clicking sound from the laptop, which I assume is the system beep. This does not happen consistently. If I plug headphones in the laptop, I do get sound in them. I have tried playing with all the possible settings both in gnome and using alsamixer. Some screens: What could I try next?

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• What to use for "localhost" that includes PHP/SQL functionality?

  - by Jack

  I really do not want to install Linux at the moment, I would have to borrow a USB key, move files, format it, flash it, format it again, move files back, give it back... What would you recommend that is lightweight, easily and cleanly uninstallable afterwards (will install Linux when I get a new DVD-ROM, which will be in ~2 weeks), that also supports PHP and SQL? To be precise, I want to install a Wordpress blog, a few plugins, etc, and develop a theme. If there is no such thing for Windows (7, x64 if that matters), let me know too, I will borrow the USB key then (even though it's a pain).

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• How should I determine if a user is logged in graphically while lightdm is running?

  - by Jack

  I want to know if someone is logged into a local X-session. In the past I looked at the output of ck-list-sessions. The output looked something like this: Session12: unix-user = '[redacted]' realname = '[redacted]' seat = 'Seat1' session-type = '' active = TRUE x11-display = ':0' x11-display-device = '/dev/tty8' display-device = '' remote-host-name = '' is-local = TRUE on-since = '2012-10-22T18:17:55.553236Z' login-session-id = '4294967295' If no one was logged in, there was no output. I checked if someone was logged in with ck_result" string => execresult("/usr/bin/ck-list-sessions | /bin/grep x11 | /usr/bin/cut --delimiter=\\' -f 2 | /usr/bin/wc -w This no longer works, because lightdm greeter looks like a logged in user Session12: unix-user = '[redacted]' realname = 'Light Display Manager' seat = 'Seat1' session-type = 'LoginWindow' active = TRUE x11-display = ':0' x11-display-device = '/dev/tty8' display-device = '' remote-host-name = '' is-local = TRUE on-since = '2012-10-22T22:17:55.553236Z' login-session-id = '4294967295' I guess I could check session-type, but I don't know how to do that and check x11-display in one-liner. I then need to write my own script, but at that point I thought I would check if anyone else has already done the work or if there is a way to get ConsoleKit to tell me what I want (or if I should be using a different tool)?

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• Huge surge in direct traffic from one particular town

  - by Jack Lockyer

  Last month I noticed that the direct visits on our site have increased by nearly 150% whilst bounce rate is also considerably up. After drilling down further I can see that we have had nearly 2000 direct visits from one town in Connecticut called Stamford, with a bounce rate of 100%! I have been scratching around for answers but I can only find that it may be to do with our uptime monitoring tool; Pingdom. Does anyone know/have any experience with this kind of issue, any help is appreciated I have just noticed that we are receiving identical traffic in a town in England and a town in Scotland... This definitely makes me think it's to do with our uptime monitoring tool.

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• Costs/profit of/when starting an indie company

  - by Jack

  In short, I want to start a game company. I do not have much coding experience (just basic understanding and ability to write basic programs), any graphics design experience, any audio mixing experience, or whatever else technical. However, I do have a lot of ideas, great analytical skills and a very logical approach to life. I do not have any friends who are even remotely technical (or creative in regards to games for that matter). So now that we've cleared that up, my question is this: how much, minimally, would it cost me to start such a company? I know that a game could be developed in under half a year, which means it would have to operate for half a year prior, and that's assuming that the people working on the first project do their jobs good, don't leave game breaking bugs, a bunch of minor bugs, etc.. So how much would it cost me, and what would be the likely profit in half a year? I'm looking at minimal costs here, as to do it, I would have to sell my current apartment and buy a new, smaller one, pay taxes, and likely move to US/CA/UK to be closer to technologically advanced people (and be able to speak the language of course). EDIT: I'm looking at a small project for starters, not a huge AAA title.

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• Graphical Mode breaks after suspend/ returning from Console

  - by Jack G

  When I try to go to a virtual console (ctrl alt f1) and return to f7, my screen freaks out. Its black with frequent white 'lightning bolts' flashing across the screen. Nothing works, but to force shutdown. Same when trying to resume from suspend. This doesnt happen every time, but very often. I dont know what information might be useful but: Ubuntu 12.10 ATI RS880M [Mobility Radeon HD 4200 Series] Gallium 0.4 on AMD RS880 this line in xsession-errors might be pertinent: (gnome-settings-daemon:1825): color-plugin-WARNING **: Done switch to new account, reload devices p.s. Ive tried the fglrx drivers but need the legacy drivers as described here, but nothing past a black screen.

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• Can I use nofollow for offsite links without it affecting my page rank?

  - by Jack

  What I have is a page with almost all offsite links. Each clicked link is forwarded on to the destination. What I would like the search engines to do is to index the text between the anchor tag and not follow the link itself. <a href="somelink">Index This Text Only</a> I've read several articles and they all seem to contradict themselves as to when to use nofollow. What's been happening over the past 2 months that the site has been live is that both Google and Bing are crawling the site as well as all the links on the site that it has been forwarded to. The search engines are now generating a lot of 404s for images and files that never existed on my site but rather seems to correlate to the site it was forwarded to. The search engines don't seem to honor the 302 header when forwarded. I would like to get a definitive answer on the nofollow tag as it relates to my situation. Can I use nofollow to stop the 404s and if so, will it affect my page ranking negatively?

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• windows 8 + Ubuntu dual boot

  - by Jack Yuan

  I installed Ubuntu 13.04 on Windows 8. Yes I can access both of them, but the process is kind of long. In BIOS, EFI is for Windows 8, legacy support is for Ubuntu. If I choose EFI first, the startup just go straight to Win8 without offering me a choice. If I choose legacy first, the starup will offer me a choice between win8 and ubuntu. But I can only choose Ubuntu. If i choose win8, there will be a mistake(file missing under configuration). That is to say, every time i wanna switch to another OS, I have to go into BIOS and change the priority settings. I heard something about secure boot might be the cause of this situation. But the thing is that there is not even an option called "secure boot" in my BIOS, which means i cannot disable it. All I want is that an option menu appears everytime i turn on my computer so i can easily choose what OS I want for today. Can anyone help me plz? Thank you very much!!

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• Ubuntu 11.10 shut down stuck

  - by Jack Mayerz

  When I shut down it is always stuck on the shut down screen where it displays the ubuntu logo and the little dots. I tried to shut it down through shell, I checked the Init. process, shell and everything. I can't find out where the problem is!! I tried to shut down through terminal session and still the same problem. It's really annoying and I have to shut down with power button every single time. Anyone got a solution?

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• Encapsulate standard C functions?

  - by Jack Stout

  While studying the C programming language and learning safe practices, I'm inclined to write a layer of functionality over several parts of the standard library. This would serve two purposes: I could use standard parts of the language in ways that feel more familiar or rational to me, and I could easily replace that functionality with my own, if I needed to. I could benefit from this, but should I do it? As an example, we can consider memory management. If I've written malloc() into the constructors of each of my objects, then decide that I need to handle memory allocation on my own, I have to edit the constructor associated with every object. By referencing my own function, I can change the contents of that function without writing a new constructors. It seems obvious that I should do this, but I'm used to Python. I'm extremely comfortable in that environment and have no problem linking to any part of the standard library from any part of my program because I know I will almost certainly leave that relationship untouched for the life of the project. The situation I'm running into with C feels like I'm trying to hide the language from myself. Will writing a layer of functionality over the C standard library help me in learning the language and developing a codebase, or will it stifle my understanding going forward?

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