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• Advanced Charts Part I

  - by Tim Dexter

  Yeeeep! Another series looms ... this one could stretch out a bit and more options become available. Ever needed to generate something similar to these? Beyond what BIP can provide today but there are a few options; one from Oracle and R, now out in the wild and another out there from JFreeChart, open source and therefore almost free. Of course Google is ever present and they have been extending their chart support. I blogged the How for Google charts a while back here. Different ways to integrate but they can all help to close the charting gap for you.

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• Avoiding "double" subscriptions

  - by john smith

  I am working on a website that requires a bit of marketing; let me explain. This website is offering a single, say, iTunes 50$ voucher to a lucky winner. To be entered in the draw, you need to invite (and has to join) at least one friend to the website. Pretty straightforward. Now, of course it would be easy for anyone to just create a fake account and invite that account so, I was thinking of some other way to somehow find out of possible cheating. I was thinking of an IP check on the newly subscribed (invited) user, and if there is the same IP logged in the last 24 hours, and if that's the case, investigate more about it. But I was thinking that maybe there is a more clever way around this issue. Has anyone ever though about this? What other solutions did you try? Thanks in advance.

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• Ubuntu 12.10 update doesnt boot. (please help)

  - by Hugtrw

  my name is Anthony. I updated to 12.10 and it the OS will not load accept in "pae" under advanced options. I used the boot repair cd, the only thing that workds is the monodeset option in the kernel and the graphics are terrible, mouse disappears and unity will not boot. Ubuntu 12.04 Runs great, on a clean install of 12.10 Ubuntu 12.10 wont even load to install unless under monodeset. I get left a termial like screen with just a bilking bar. Im running a HP Compaq NC6400 Laptop, Ubuntu 32-bit, 2gb ram.

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• Login screen won't accept my password

  - by Raven H

  I recently upgraded to 12.04 from 11.10 and since upgrading have been unable to login to my user profile. The upgrade went okay and I can login to a guest session fine but whenever I try to login to my profile, after entering my password, I just return to the login screen. I've changed my password in Root (passwd 'username')and can log in to tty1 with no issues, it's just in GUI I'm having problems. I'm using a HP dv7 laptop, 32 bit Ubuntu install, Intel® Core™2 Duo CPU P7350 @ 2.00GHz × 2, Nvidia graphics. Any help would be appreciated.

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• =~ (equal-sign tilde) and m" ... " in .htaccess directive

  - by Lèse majesté

  I saw this bit of code on an old forum post: SSLRequire %{HTTP_HOST} =~ m"\.secure\.powweb\.com" And I was just wondering what the =~ and m" ... " meant. I've been searching online and in the Apache documentation for any mention of the equal-sign tilde operator, but I've found no mention of it. I know that some directives can take a tilde to use a regular expression, but I've never seen the m" ... " form used before. What exactly is that m" ... " for? Where else would you see this form?

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• Is a yobibit really a meaningful unit? [closed]

  - by Joe

  Wikipedia helpfully explains: The yobibit is a multiple of the bit, a unit of digital information storage, prefixed by the standards-based multiplier yobi (symbol Yi), a binary prefix meaning 2^80. The unit symbol of the yobibit is Yibit or Yib.1[2] 1 yobibit = 2^80 bits = 1208925819614629174706176 bits = 1024 zebibits[3] The zebi and yobi prefixes were originally not part of the system of binary prefixes, but were added by the International Electrotechnical Commission in August 2005.[4] Now, what in the world actually takes up 1,208,925,819,614,629,174,706,176 bits? The information content of the known universe? I guess this is forward thinking -- maybe astrophyics or nanotech, or even DNA analysis really will require these orders of magnitude. How far off do you think all this is? Are these really meaningful units?

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• How to organize my site's file system properly?

  - by Wolfpack'08

  Doing some reading on Stack Overflow, I've found a lot of information suggesting that proper organization of a file system is crucial to a well-written web app. One of the key pieces of evidence is high-frequency references to "separation of concerns" in questions related to keeping programs organized. Now, I've found some information on organizing file systems (Filesystem Hierarchy Standard) from 2004. It raises only two concerns: first, the standard's a bit dated, so I believe it may be possible to do better given the changes in technology over the past 8 years; second, and most important, my application is very small compared to an entire Linux distro. I think that the file system should be organized very differently because of that. Here's what I'm looking at, currently: /scripts, /databases, /www -> /dev, /production -> login, router, admin pages, /sites -> content types, static pages /modules, /includes, /css, /media -> /module-specific-media

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• How Would You Design This Table?

  - by sooprise

  I have to create a table where each row needs to store 50 number values. Each row will always need to store 50 number values. If this was a smaller number of values, I would just make fields for each of the values, but because there are 50, this approach seems a bit cumbersome (but since it will always be 50 values, maybe this is the correct approach?). Is there a way to store an array of values in a field? This seems like a nice solution, but the concept is almost identical to creating a relational database.

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• Some help understanding and modifying a 2D shader

  - by electroflame

  I have a similar question as the one posed here, except that I don't wish to use a 1D Color Palette. I simply wish to have it display 1 color of my choosing (red, for example). I plan to use this as a "shield" effect for a 2D ship. I also wish to understand how it works a little bit better, as I'll be the first to admit that shaders in general are not my strongest suit. I'm not asking for an overview of HLSL (as that is too broad of a subject), just an explanation of how this shader works, and the best way to implement it in a 2D game. Code examples would be ideal (even if they are theoretical) but if the answer is explained well enough, I might be able to manage with plain old text. This is also in XNA 4.0. Thanks in advance.

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• What are the benefits of a disk install vs. Wubi? And can I migrate my settings easily?

  - by Alex Bixel

  I chose to do the Wubi install because it was short, simple, and easy to reverse (no messing with partitions required). To be honest, I can handle the lack of a hibernate function. I haven't really heard many other benefits of installing on a separate partition than hibernation and negligibly faster hard disk read/write. Yet almost everyone I encounter seems to have opted for the disk installation. Are there more benefits I should be aware of, especially as a college student who wants a fast, efficient machine for documents, web browsing, etc. (nothing big like gaming, I can run that on Windows)? Also, I have a fair amount of settings and packages installed that I spent a bit of time on and would rather not have to do again. Is there any way I can migrate all of these settings from the virtual disk on my C:/ drive (Wubi installation) to the disc installation in another partition? (I have a 16GB USB drive if that'll do the trick)

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• What's the difference or purpose of a file format like ELF when flat binaries take up less space and can do the same thing?

  - by Sinister Clock

  I will give a better description now. In Linux driver development you need to follow a specification using an ELF file format as a finalized executable, i.e., that right there is not flat, it has headers, entry fields, and is basically carrying more weight than just a flat binary with opcodes. What is the purpose or in-depth difference of a Linux ELF file for a driver to interact with the video hardware, and, say, a bare, flat x86 16-bit binary I write that makes use of emulated graphics mode on a graphics card and writes to memory(besides the fact that the Linux driver probably is specific to making full use of the hardware and not just the emulated, backwards compatible memory accessing scheme). To sum it up, what is a difference or purpose of a binary like ELF with different headers and settings and just a flat binary with the necessary opcodes/instructions/data to do the same thing, just without any specific format? Example: Windows uses PE, Mac uses Mach-O/PEF, Linux uses ELF/FATELF, Unix uses COFF. What do any of them really mean or designate if you can just go flat, especially with a device driver which is system software.

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• Can I Use A Canonical Tag Instead of a Redirect for Updated Content?

  - by Ewan Heming

  I have some old articles on my blog that get quite a bit of traffic, but are very outdated. I want to remove them from Google's index using the noindex tag, but I'm not sure what the best approach will be to send the same traffic to my new article on the subject without using a redirect (as I want to keep them in my blog archives). I was intending to just put a link at the top of the article pointing to the new one, but was wondering if it was appropriate to use a canonical tag instead; the new article is on the same subject but doesn't contain the same content, so isn't really a copy.

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• Unable to boot 12.04 server: no LVM activated and impossible to mount /

  - by baronKarza

  I'm stuck in the Busy Box shell after upgrading from Ubuntu server 11.10 to Ubuntu server 12.04 64 bit. During the booting phase the system hangs while mounting root filesystem. My system is so configured: /dev/sda1 -- /boot /dev/mapper/vg-lv_root /dev/mapper/vg-lv_var /dev/mapper/vg-lv_tmp When the boot process fails and I'm forwarded to the busybox shell, if I type vgchange -ay I can mount my volumes and all it's OK. But it does not enable LVM automatically so that it is impossible to mount root, var, and tmp. I tried to start with a Knoppix, chroot, reinstall (aptitude) both kernel and lvm2 as suggested by this tread "Fixing unbootable installation on LVM root from Desktop LiveCD": nothing changed. I can't figure out what is the problem. Any suggestion is welcome. Thanks in advance.

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• What does it mean for SVN "to pollute the local source tree"?

  - by asd

  I'm reading "Professional Team Foundation Server 2010" by Wrox, and in an advantages/disadvantages list, the said: "Like CVS, SVN makes use of .svn directories inside the source folders to store state of the local working copy, and to allow synchronization with the server. However, it can have the affect of polluting the local source tree, and can cause performance issues wiht very large projects or files." What does the bit about pollution mean? I've used SVN for C# & ASP.NET projects for a long time and haven't encountered any problems. What probably does this quote think I should have been watching out for?

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• Storing a Hex Grid

  - by Pedro Caetano

  I've been creating a small hex grid framework for Unity3D and have come to the following dilema. This is my coordinate system (taken from here) Link because I'm a new user It all works pretty nicely except for the fact I have no idea how to store it. I originally intended to store this in a 2D array and use images to generate my maps. One problem was that it had negative values (this was easily fixed by offsetting the coordinates a bit). However, due to this coordinate system, such an image or bitmap would have to be diamond shaped - and since these structures are square shaped, this would cause a lot of headaches even if I hack something together. Is there anything I'm missing that could fix this? I recall seeing a forum post regarding this in the unity forums but I can no longer find the link. Is writing a set of coordinate translators the best solution here? If you guys think it would be helpful, I can post code and images of my problem.

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• Kernel panic when booting from USB

  - by maaartinus

  I downloaded ubuntu-11.04-desktop-amd64.iso and used Universal-USB-Installer-1.8.6.3.exe to format my USB stick und put the ISO on it. When I tried to install from it, I've got a kernel panic just like here, except for the version number (mine was 2.6.38-8-generic #42-ubuntu). My ISO image seems to work, as I installed it into a VMWare player without problems. Booting Linux from USB works surely too, as I did it some time ago with an older Ubuntu version. I can imagine things to try out, e.g., write the image again, try another version, pray, look for patches, etc. However, I'm looking for a time-efficient solution, something what most probably works. An advice of the sort "wait two weeks until it's surely fixed, then download again" is acceptable, I'm determined to switch to Linux, but it can wait a bit.

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• Burn MP4 to CD in ubuntu 12.04

  - by xyc

  I have an mp4 file (115,8 mb). I want to burn it to a Sony CD-R (700 mb) to watch on tv. I tried to do it with DeVeDe from ubuntu software center but it always give me this error: "Conversion failed. It seems a bug of Mencoder." Can anyone tell me an other method to burn my mp4 to cd? Or can anyone tell me how to fix DeVeDe's error? I use a TOSHIBA computer (64 bit) with windows 7 home premium and ubuntu 12.04 LTS (installed via wubi.exe). Thx.

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• How much game dev does $x amount of money get you?

  - by Frank

  How much a game costs to make gets asked often and is always answered with it depends or varies on the quality of the game. Well this is basically the same question but is a bit more precise. I'm wonder what quality of game you can make with varying degrees of funds. Lets say 500k, 1m, 2m, 5m, 10m, 15m, and 20m. Let's assume you don't do any of it yourself and it only covers development only... no advertising or manufacturing.

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• 3D RTS pathfinding

  - by xcrypt

  I understand the A* algorithm, but I have some trouble doing it in 3D to suit the needs of my RTS Basically, in the game I'm making, there will be agents with different sizes of OBB collision boxes. I can use steering behaviours for avoiding other agents, so I don't need complete dynamic pathfinding. However, there is a problem because different agents have different collision geometry, and structures can be placed in almost any place. This means that there might be a gap between two structures where some agents can go through and some can't. A solution I have found to this problem is to do a sweep of the collision geometry of the agent from start node of the edge the pf algorithm is currently testing, to the end node of that edge. But this is probably a bit overkill since every edge the algorithm tests would also have to create and test with a collision geometry sweep. What are some reasonable approaches to this problem? I should mention that I'd prefer not to use navmeshes, I prefer waypoints because my entire system is based on it atm.

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• Programming Entity Framework, 2nd Edition (EF4) Table of Contents

  We are closing in on finalizing the 2nd edition of Programming Entity Framework! Although the rough draft chapters are already available through Safari’s Rough Cuts program (here: http://oreilly.com/catalog/9780596807252) I have been editing and reshaping the content since those chapters were published. You can get the final print edition (August 15th or perhaps a bit earlier) at O’Reilly or pre-order it here on Amazon.com (here) (and elsewhere of course!) I believe that the book will...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• anyone familiar with these analytic questions?

  - by Moon

  So...my recruiter just called me to confirm my interview on Thurs. He also mentioned that I am going to be asked to answer for two analytic questions. He gave me a little bit about those questions. There are eight balls. One of them is defective. There are three incandescent light bulbs inside a room, but switches are placed outside. These are all he said. I think that these are not completed question. Anyone knows what questions these are?? Does my question belong to programmer.stackexchange.com? I thought it would because it is related to interview questions.

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• How do I mount an HP Touchpad (Cyanogen Mod 9)?

  - by C.Werthschulte

  I've recently installed Cyanogen Mod 9 on my HP Touchpad tablet, but I'm encountering problems when trying to access it from my Ubuntu laptop (Ubuntu 11.10, Gnome-Shell, Nautilus). I've first tried accessing it via PTP as suggested here. Ubuntu will recognize the Touchpad as a digicam and only grant me access to two directories: "DCIM" and "Pictures". I then tried accessing the tablet via MTP using this post on OMGUbuntu!. Ubuntu will connect to the tablet, but only grant me access to a folder named "Playlists". I'm a bit clueless as to what I'm doing wrong and would very much appreciate any help or hints. Many thanks!

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• How do I un-zoom compiz?

  - by Ken

  I'm using a keyboard I'm not used to, and I hit Super_L instead of Alt_L when I middle-mouse-dragged across the screen. On this Ubuntu 10.04 with Compiz, apparently, this zooms the screen to the area that I dragged across. Now I'm stuck. I can super-middle-drag across a bigger area, but apparently I can't quite hit all of the corners exactly because the screen still moves a bit when I move the mouse around. How do I undo this zoom effect completely? This looks like "EZoom", which says that super-"1" (default keybinding, anyway) should reset it, but that doesn't seem to work here. Close...

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• Vanilla forum personal journal tool

  - by user16648

  I am developing a forum for a research project, i am using Vanilla forum (though i am not tied to this yet). Another feature of this site will be a personal journal/diary/blog. Only the user and administrators will have access to the journal. The journal does not need any advanced features. Does anybody have any suggestions on software/script that could easily be integrated with Vanilla forum for this purpose? My first thought was using Wordpress but it is a bit to complex to adminstrate as the site is meant to be simple. And i dont really see how it can be intregrated easily the way i want it.

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• Students Can Discover JavaOne for Free

  - by Tori Wieldt

  Students can get a FREE Discover Pass for JavaOne to learn a bit about Java and network with experienced Java professionals. To be eligible, students must be • At least 18 years-old • Taking a minimum of 6 units • Enrolled in a nonprofit institution of learning Students will get all the benefits of a Discover attendee, which includes: JavaOne and OpenWorld keynotes; Exhibition Halls; and, space permitting, students can also attend JavaOne Technical and BOF (Birds-of-a-Feather) sessions, and HOLs (Hands-on Labs). Don't miss out on this opportunity for a real education with a FREE Discover Pass!

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