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• How to "translate" interdependent object states in code?

  - by Earl Grey

  I have the following problem. My UI interace contains several buttons, labels, and other visual information. I am able to describe every possible workflow scenario that should be be allowed on that UI. That means I can describe it like this - when button A is pressed, the following should follow - In the case of that A button, there are three independent factors that influence the possible result when pushing the A button. The state of the session (blank, single, multi, multi special), the actual work that is being done by the system at the moment of pressing the A button (nothing was happening, work was being done, work was paused) and a separate UI element that has two states (on , off)..This gives me a 3 dimensional cube with 24 possible outcomes. I could write code for this using if cycles, switch cycles etc....but the problem is, I have another 7 buttons on that ui, I can enter this UI from different states..some buttons change the state, some change parameters... To sum up, the combinations are mindbogling and I am not able come up with a methodology that scales and is systematically reliable. I am able to describe EVERY workflow with words, I am sure my description is complete and without logical errors. But I am not able to translate that into code. I was trying to draw flowcharts but it soon became visually too complicated due to too many if "emafors". Can you advice how to proceeed?

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• How to manage own bots at the server?

  - by Nikolay Kuznetsov

  There is a game server and people can play in game rooms of 2, 3 or 4. When a client connects to server he can send a request specifying a number of people or range he wants to play with. One of this value is valid: {2-4, 2-3, 3-4, 2, 3, 4} So the server maintains 3 separate queues for game room with 2, 3 and 4 people. So we can denote queues as #2, #3 and #4. It work the following way. If a client sends request, 3-4, then two separate request are added to queues #3 and #4. If queue #3 now have 3 requests from different people then game room with 3 players is created, and all other requests from those players are removed from all queues. Right now not many people are online simultaneously, so they apply for a game wait for some time and quit because game does not start in a reasonable time. That's a simple bot for beginning has been developed. So there is a need to patch server code to run a bot, if some one requests a game, but humans are not online. Input: request from human {2-4, 2-3, 3-4, 2, 3, 4} Output: number of bots to run and time to wait for each before connecting, depending on queues state. The problem is that I don't know how to manage bots properly at the server? Example: #3 has 1 request and #4 has 1 request Request from user is {3,4} then server can add one bot to play game with 3 people or two bots to play game of 4. Example: #3 has 1 request and #4 has 2 requests Request from user is {3,4} then in each case just one bot is needed so game with 4 players is more preferrable.

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• How to do IIS SSL server redirects correctly? Is meta refresh needed?

  - by Jesse

  Hi all! I think our backend programmer/server admin is handling our SSL redirects pretty wonky - see it in action here: www.mchenry.edu/parentorientation First off, see how it redirects to index2.asp? Is this necessary? Can't she easily redirect to the original index.asp but have it be https:// instead? Also, she is using a meta refresh on the original index.asp page to redirect to index2.asp as well, and she says this is for backup, in case the server configs change and the server can't handle the redirect so then the webpage would take over. Finally, she said she tried using the server redirect solely but that it kept looping on itself- what did she do wrong? Is this even possible? Is she giving us a snow job or what? I want a better understanding of what is happening here so I can talk to my boss about it, because this is driving me up the wall. Thanks for any info you can provide.

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• Why are my 32bit OpenGL libraries pointing to mesa instead of nvidia, and how do I fix it?

  - by Codemonkey

  I have installed Nvidia's drivers on my Ubuntu 13 system, but according to this command (ldconfig -p | grep GL): $ ldconfig -p | grep GL libQtOpenGL.so.4 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libQtOpenGL.so.4 libGLU.so.1 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libGLU.so.1 libGLEWmx.so.1.8 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libGLEWmx.so.1.8 libGLEW.so.1.8 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libGLEW.so.1.8 libGLESv2.so.2 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/mesa-egl/libGLESv2.so.2 libGL.so.1 (libc6,x86-64) => /usr/lib/libGL.so.1 libGL.so.1 (libc6) => /usr/lib/i386-linux-gnu/mesa/libGL.so.1 libGL.so (libc6,x86-64) => /usr/lib/libGL.so libEGL.so.1 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/mesa-egl/libEGL.so.1 The 32bit version of OpenGL is pointing to mesa's libraries instead of nvidia. This causes my Steam games to refuse to launch with the error: Could not find required OpenGL entry point 'glGetError'! Either your video card is unsupported, or your OpenGL driver needs to be updated. Why is this the case? When the nvidia installer asked me if I wanted to install "32bit compatability libraries" (or something like that) I chose yes. How do I fix this? Edit: I just reinstalled the same Nvidia driver, and that apparently removed the 32bit OpenGL driver completely: $ ldconfig -p | grep libGL.so libGL.so.1 (libc6,x86-64) => /usr/lib/libGL.so.1 libGL.so (libc6,x86-64) => /usr/lib/libGL.so Now Steam won't start: You are missing the following 32-bit libraries, and Steam may not run: libGL.so.1 Again, I chose YES when the installer asked me if I wanted to install 32bit libraries. Why are they not installed!?

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• Spotlight: How Scandinavia's Largest Nuclear Power Plant Increased Productivity and Reduced Costs wi

  - by [email protected]

  Ringhals nuclear power plant, which is part of the Vattenfall Group, is located about 60 km south-west of the beautiful coastal city of Gothenburg in Sweden. A deep concern to reduce environmental impact coupled with an effort to increase plant safety and operational efficiency have led to a recent surge in investments and initiatives around plant modification and plant optimization at Ringhals. A multitude of challenges were faced by the users in various groups that were involved in these projects. First, it was very difficult for users to easily access complex and layered asset and engineering information, which was critical to increased productivity and completing projects on time. Moreover, the 20 or so different solutions that were being used to view various document formats, not only resulted in collaboration complexity but also escalated IT administration costs and woes. Finally, there was a considerable non-engineering community comprising non-CAD specialists that needed easy access to plant data in an effort to minimize engineering disruption. Oracle's AutoVue significantly simplified the ability to efficiently view and use digital asset information by providing a standardized visualization solution for the enterprise. The key benefits achieved by Ringhals include: Increased productivity of plant optimization and plant modification by 3% Saved around $ 500 K annually Cut IT maintenance costs by 50% by using a single solution Reduced engineering disruption by allowing non-CAD users easy access to digital plant data The complete case-study can be found here

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• Comparing Dates in Oracle Business Rule Decision Tables

  - by James Taylor

  I have been working with decision tables for some time but have never had a scenario where I need to compare dates. The use case was to check if a persons membership had expired. I didn't think much of it till I started to develop it. The first trap I feel into was trying to create ranges and bucket sets. The other trap I fell into was not converting the date field to a complete date. This may seem obvious to most people but my Google searches came up with nothing so I thought I would create a quick post. I assume everyone knows how to create a decision table so I'm not going to go through those steps. The prerequisite for this post is to have a decision table with a payload that has a date field. This filed must have the date in the following format YYYY-MM-DDThh:mm:ss. Create a new condition in your decision table Right-click on the condition to edit it and select the expression builder In the expression builder, select the Functions tab. Expand the CurrentDate file and select date, and click Insert Into Expression button. In the Expression Builder you need to create an expression that will return true or false, add the operation <= after the CurrentDate.date In my scenario my date field is memberExpire, Navigate to your date field and expand, select toGregorianCalendar(). Your expression will look something like this, click OK to get back to the decision table Now its just a matter of checking if the value is true or false. Simple when you know how :-)

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• Installing all the bits to demo Entity Framework 4 on the Visual Studio 2010 Release Candidate

  - by Eric Nelson

  Next week (17th March 2010) I am presenting on EF4 at www.devweek.com in London (and Azure on the 18th). Today I wanted to get all the latest bits on my demo machine and also check if there are any cool new resources I can point people at. Whilst most of the new improvements in Entity Framework come with the Visual Studio 2010 RC (and the RTM), there are a couple of separate items you need to install if you want to explore all the features. To demo EF4 you need: Visual Studio 2010 RC Download and install the Visual Studio 2010 Release Candidate. In my case I went from the Ultimate Edition but it will work fine on Premium and Professional. POCO Templates See the team blog post for a detailed explanation. Use the Extension Manager inside Visual Studio 2010: And install the updated POCO templates for either C# or VB (or both if you are so inclined!): Code First Next you will also need to install Code First (formally called Code Only). This is part of the Entity Framework Feature CTP 3. See the team blog post for a detailed explanation. Download the CTP from Microsoft downloads and run the setup. This will give you a new dll for Code First Optionally (but I recommend it) install LINQPad for the RC Download LINQPad Beta for .NET 4.0 Related Links 101 EF4 Resources

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• BizTalk: Dynamic SMTP Port: Unknown Error Description

  - by Leonid Ganeline

  Today I investigated one strange error working with Dynamic SMTP Port.   Event Type: Error Event Source: BizTalk Server 2006 Event Category: BizTalk Server 2006 Event ID: 5754 Date: ******** Time: ********AM User: N/A Computer: ******** Description: A message sent to adapter "SMTP" on send port "*********" with URI "mailto:********.com" is suspended. Error details: Unknown Error Description  MessageId:  {********} InstanceID: {********}   My code was pretty simple and the source of the error was hidden somewhere inside it.   msg_MyMessage(SMTP.CC) = var_CC; msg_MyMessage(SMTP.From) = var_From; msg_MyMessage(SMTP.Subject) = var_Subject; msg_MyMessage(SMTP.EmailBodyText) = var_Message;    // #1    msg_MyMessage(SMTP.SMTPHost) = " localhost "; msg_MyMessage(SMTP.SMTPAuthenticate) = 0; When I added line #2, this frustrating error disappeared.    msg_MyMessage(SMTP.EmailBodyTextCharset) = "UTF-8"; // #2 Conclusion: If we use the SMTP.EmailBodyText property, we must set up the SMTP.EmailBodyTextCharset property. To me it looks like a bug in BizTalk. [Maybe it is "by design", but in this case give us a useful error text!!!] And don't ask me how much time I've spent with this investigation.

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• Javascript: Machine Constants Applicable?

  - by DavidB2013

  I write numerical routines for students of science and engineering (although they are freely available for use by anybody else as well) and am wondering how to properly use machine constants in a JavaScript program, or if they are even applicable. For example, say I am writing a program in C++ that numerically computes the roots of the following equation: exp(-0.7x) + sin(3x) - 1.2x + 0.3546 = 0 A root-finding routine should be able to compute roots to within the machine epsilon. In C++, this value is specified by the language: DBL_EPSILON. C++ also specifies the smallest and largest values that can be held by a float or double variable. However, how does this convert to JavaScript? Since a Javascript program runs in a web browser, and I don't know what kind of computer will run the program, and JavaScript does not have corresponding predefined values for these quantities, how can I implement my own version of these constants so that my programs compute results to as much accuracy as allowed on the computer running the web browser? My first draft is to simply copy over the literal constants from C++: FLT_MIN: 1.17549435082229e-038 FLT_MAX: 3.40282346638529e+038 DBL_EPSILON: 2.2204460492503131e-16 I am also willing to write small code blocks that could compute these values for each machine on which the program is run. That way, a supercomputer might compute results to a higher accuracy than an old, low-level, PC. BUT, I don't know if such a routine would actually reach the computer, in which case, I would be wasting my time. Anybody here know how to compute and use (in Javascript) values that correspond to machine constants in a compiled language? Is it worth my time to write small programs in Javascript that compute DBL_EPSILON, FLT_MIN, FLT_MIN, etc. for use in numerical routines? Or am I better off simply assigning literal constants that come straight from C++ on a standard Windows PC?

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• What is the correct way to restart udev in Ubuntu?

  - by zerkms

  I've changed the name of my eth1 interface to eth0. How to ask udev now to re-read the config? service udev restart and udevadm control --reload-rules don't help. So is there any valid way except of rebooting? (yes, reboot helps with this issue) UPD: yes, I know I should prepend the commands with sudo, but either one I posted above changes nothing in ifconfig -a output: I still see eth1, not eth0. UPD 2: I just changed the NAME property of udev-rule line. Don't know any reason for this to be ineffective. There is no any error in executing of both commands I've posted above, but they just don't change actual interface name in ifconfig -a output. If I perform reboot - then interface name changes as expected. UPD 3: let I explain all the case better ;-) For development purposes I write some script that clones virtual machines (VirtualBox-driven) and pre-sets them up in some way. So I perform a command to clone VM, start it and as long as network interface MAC is changed - udev adds the second rule to network persistent rules. Right after machine is booted for the first time there are 2 rules: eth0, which does not exist, as long as it existed in the original VM image MAC eth1, which exists, but all the configuration in all files refers to eth0, so it is not that good for me So I with sed delete the line with eth0 (it is obsolete and useless in cloned image) and replace eth1 with eth0. So currently I have valid persistent rule, but there is still eth1 in /dev. The issue: I don't want to reboot the machine (it will take another time, which is not good thing on building-VM-stage) and just want to have my /dev rebuilt with some command so I have ready-to-use VM without any reboots.

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• Inheriting projects - General Rules? [closed]

  - by pspahn

  Possible Duplicate: When is a BIG Rewrite the answer? Software rewriting alternatives Are there any actual case studies on rewrites of software success/failure rates? When should you rewrite? We're not a software company. Is a complete re-write still a bad idea? Have you ever been involved in a BIG Rewrite? This is an area of discussion I have long been curious about, but overall, I generally lack the experience to give myself an answer that I would fully trust. We've all been there, a new client shows up with a half-complete project they are looking to finish and launch. For whatever reason, they fired their previous developer, and it's now up to you to save the day. I am just finishing up a code review for a new client, and in my estimation is would be better to scrap what the previous developers built since and start from scratch. There's a ton of reasons why I am leaning toward this way, but it still makes me nervous since the client isn't going to want to hear "those last guys built you a big turd, and I can either polish it, or throw it in the trash". What are your general rules for accepting these projects? How do you determine whether it will be better to start from scratch or continue with the existing code base? What other extra steps might you take to help control client expectations, since the previous developer may have inflated those expectations beyond a reasonable level? Any other general advice?

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• I want to install an MSI twice

  - by don.vince

  I have a peculiar wish to install an msi twice on a machine. The purpose of the double install is to first install under the pre-production folder, run the deployment in a safe environment prior to deploying in the production folder. We typically use separate machines to represent these different environments however in this case I need to use the same box. The two scenarios I get are as follows: I've installed pre-production, I'm happy, I want to install production, I run the msi, it asks whether I want to repair or remove the installation I've production installed, I want to install the new version of the msi, it tells me I already have a version of the product installed and I must first un-install the current version The first scenario isn't too bad as we can at that point sensibly un-install and re-install under the production folder, but the second scenario is a pain as we don't want to un-install the live production deployment. Is there a setting I can give to msiexec that will allow this? Is there a more suitable different approach I could use?

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• Automatic LaTex document generation from Excel spreadsheet

  - by Bowler

  I have some data in an excel file from which I have to generate a report. I repeat this task fairly regularly and am looking to automate it. I have a LaTeX project into which I usually just copy data by hand, export the necessary worksheets as pdfs and add them to my LaTeX project and compile with pdflatex. It has occured to me that there must be a way to automate this process. Is there an efficient way to export the data from excel and into a LaTeX project, possibly a vba script in excel could run the process? Also, it doesn't have to be LaTeX, I'm not all that experienced with MS office's more advanced features is there some way akin to a mail merge that I could achieve this with? In some ways this might be better in case I have to pass the work on to someone who doesn't know LaTeX. Thanks.

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• How do I identify which rewrite rule is being trigger on IIS 7.5?

  - by Jordan Reiter

  I have a set of rewrite rules (offhand, I would say around 40-50) for a given server. It's basically to handle and reroute mangled URLs so that bad links still go to where they're supposed to go. I've come across an URL that is redirecting and I can't figure out which rewrite rule it is applying. My background is Apache and in that case I'd simply enable a rewrite log and look at the logged output to figure out what was happening. Is there an equivalent way to do this in IIS? bonus round Any way for me to view & edit the rewrite rules in a text file rather than the GUI interface?

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• What's wrong with my custom .desktop xsession?

  - by Noam Gagliardi

  I want to create a custom Xmonad session that loads an .xsession script in my home folder. This is the original file I copied. This one works: [Desktop Entry] Encoding=UTF-8 Name=XMonad Comment=Lightweight tiling window manager Exec=xmonad Icon=xmonad.png Type=XSession This is my modified file, xmonad-custom.desktop. When I logout, then login choosing this "xmonad-custom", the screen just flashes and sends me back to the ubuntu login screen (as if it briefly logs in and out of the session): [Desktop Entry] Encoding=UTF-8 Name=XMonad Custom Comment=Lightweight tiling window manager Exec=/home/{username}/.xsession Icon=xmonad.png Type=XSession X-Ubuntu-Gettext-Domain=gdm I also tried without the last line. This is my ~/.xsession file, in case there's an error with this script: #!/bin/env bash xrdb -merge .Xresources trayer --edge top --align right --SetDockType true --SetPartialStrut \ true --expand true --width 15 --height 12 --transparent true --tint 0x000000 & dropbox start & exec xmonad

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• ArchBeat Link-o-Rama Top 20 for April 1-9, 2012

  - by Bob Rhubart

  The top 20 most popular items shared via my social networks for the week of April 1 - 8, 2012. Webcast: Oracle Maximum Availability Architecture Best Practices w/Tom Kyte - April 12 Oracle Cloud Conference: dates and locations worldwide Bad Practice Use Case for LOV Performance Implementation in ADF BC | Oracle ACE Director Andresjus Baranovskis How to create a Global Rule that stores a document’s folder path in a custom metadata field | Nicolas Montoya MySQL Cluster 7.2 GA Released How to deal with transport level security policy with OSB | Jian Liang Webcast Series: Data Warehousing Best Practices http://bit.ly/I0yUx1 Interactive Webcast and Live Chat: Oracle Enterprise Manager Ops Center 12c Launch - April 12 Is This How the Execs React to Your Recommendations? | Rick Ramsey Unsolicited login with OAM 11g | Chris Johnson Event: OTN Developer Day: MySQL - New York - May 2 OTN Member discounts for April: Save up to 40% on titles from Oracle Press, Pearson, O'Reilly, Apress, and more Get Proactive with Fusion Middleware | Daniel Mortimer How to use the Human WorkFlow Web Services | Oracle ACE Edwin Biemond Northeast Ohio Oracle Users Group 2 Day Seminar - May 14-15 - Cleveland, OH IOUG Real World Performance Tour, w/Tom Kyte, Andrew Holdsworth, Graham Wood WebLogic Server Performance and Tuning: Part I - Tuning JVM | Gokhan Gungor Crawling a Content Folio | Kyle Hatlestad The Java EE 6 Example - Galleria - Part 1 | Oracle ACE Director Markus Eisele Reminder: JavaOne Call For Papers Closing April 9th, 11:59pm | Arun Gupta Thought for the Day "A distributed system is one in which the failure of a computer you didn't even know existed can render your own computer unusable." — Leslie Lamport

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• How to keep Windows 7 from sleeping while scanning the PC.

  - by D Connors

  So, I've been using Microsoft Security Essentials lately. And it usually takes a couple hours or more for it to full scan my hard drive. Because of that, I commonly leave it scanning while I go do something else. Problem is: 10 minutes later, windows 7 goes to sleep, and the scan is (obviously) paused. That's What I'd like to stop happening. So far, the only way I've been able to avoid it was to create a power plan, and switch to it while away, to keep the PC from sleeping. Problem is that I have to keep switching power plans and I'd like the PC to be able to go to sleep in case MSE finishes scanning and I'm still not back. Maybe I'm just asking for too much, but I've been surprised by the users here plenty of times already. So let me know if you know how to keep the PC from sleeping while MSE is scanning. Thanks

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• String patterns that can be used to filter and group files

  - by Louis Rhys

  One of our application filters files in certain directory, extract some data from it and export a document from the extracted data. The algorithm for extracting the data depends on the file, and so far we use regex to select the algorithm to be used, for example .*\.txt will be processed by algorithm A, foo[0-5]\.xml will be processed by algo B, etc. However now we need some files to be processed together. For example, in one case we need two files, foo.*\.xml and bar.*\.xml. Part of the information to be extracted exist in the foo file, and the other part in the bar file. Moreover, we need to make sure the wild card is compatible. For example, if there are 6 files foo1.xml foo23.xml bar1.xml bar9.xml bar23.xml foo4.xml I would expect foo1 and bar1 to be identified as a group, and foo23 and bar23 as another group. bar9 and foo4 has no pair, so they will not be treated. Now, since the filter is configured by user, we need to have a pattern that can express the above requirement. I don't think you can express meaning like above in standard regex. (foo|bar).*\.xml will match all 6 file above and we can't identify which file is paired for a particular file. Is there any standard pattern that can express it? Or any idea how to modify regex to support this, that can be implemented easily?

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• Keyboard lights sometimes stay on after PC is powered off. Why?

  - by Vilx-

  Sometimes when I power off my PC some lights on the keyboard stay on. It's pretty random which ones, though I suspect it has something to do with what lights were on just before the shutdown (if I vigorously follow that they are all off while the PC is shutting down then they stay off). Not that this would change anything, but it is annoying. Why does this happen and how can I avoid it? Added: I know that I can turn off the power completely to my computer and it will go off. That's not the point. Actually, I even want my keyboard to have power, because I use it to turn on my computer (the power button on the case is difficult to reach). I just want the lights to go off. Or at least understand why this happens. Oh, and it's a PS2 keyboard.

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• Redirect anything within /attachments/ directory up one level but also removing anything after /attachments/

  - by Rich Staats

  WordPress creates an attachment page for any images uploaded through the post editor and "attached" to that post. After migrating a site, those attachment pages no longer exist, and we now have around 1000 links pointed at 404's. So, I was looking to find a way to do a redirect for any url that has /attachement/ in it's string and then push that url back up one level (which happens to be the post page). so for instance: http://mysite.com/2012/news/blog-post-title/attachment/image-page/ (which doesnt exist) will go to http://mysite.com/2012/news/blog-post-title/ (which does exist). Along with redirecting up one level, I also need to remove anything after /attachment/ (in this case the "image-page." Any suggestions? Thanks in advance

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• Drive project success & financial performance with business critical Enterprise Project Portfolio Management

  - by Sylvie MacKenzie, PMP

  Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman","serif";} Oracle Primavera invites you to the first in a series of three webcasts linking Enterprise Project Portfolio Management with enhanced operational performance and better financial results. Few organizations fully understand the impact projects have on their business. Consistently delivering successful projects is vital to the financial success of an asset intensive organization. Enterprise Project Portfolio Management (EPPM) is not a new concept yet for many organizations it is not considered "business critical". Webcast 1: Plan – Aligning project selection and prioritization with corporate objectives This webcast will look at 2 key questions: Are you aligning portfolio decisions with strategic objectives? How do you effectively measure the success of your portfolio decisions? Hear from Accenture who'll present a compelling case for why asset intensive organizations should consider EPPM as business critical. They'll explore: How technology is being used to enhance project delivery How collaboration enhances delivery performance The major challenges associated with the planning phase of a project Next hear from Geoff Roberts, Industry Strategist from Oracle Primavera. With over 30 years experience in project management/project controls in the construction, utilities and oil & gas sectors, Geoff will investigate how EPPM is a best practice and can support an organization through project selection and prioritization ensuring that decisions are aligned with corporate objectives. Don’t miss out, register today!

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• How to create or recover Windows Bootloader after deleting Ubuntu boot drive

  - by Kincaid

  I have a computer that dual-boots (or tri-boots) Windows 8 Release Preview, Windows 7, and Ubuntu 12.04. Grub boots between Windows 8 and Ubuntu; for which I use primarily. Recently, I decided to remove Ubuntu, as I hardly used it. I deleted the Ubuntu partition accidentally before replacing the Grub bootloader. Now, whenever I want to boot the machine, it gives me the "grub-rescue" prompt -- I am unable to boot into either Windows (8 nor 7), nor Ubuntu (except via USB, of course). I do not have any Windows 7/8 recovery media, so that isn't an option. Please note that after I deleted the Ubuntu partition, I put the PC into hibernate, and then turned it on. This means the C:\ [Windows 8] drive cannot be mounted. I don't know if that is bad, but it definitely doesn't make things better. I am currently booting Ubuntu via USB, in an effort to restore the Windows bootloader. I have looked into using boot-repair to solve the problem using the instructions here, although after attempting to apply the changes, it gave the error: "Please install the [mbr] packages. Then try again." I don't know why I'm getting this error; is there a way to install the 'mbr packages?' I honestly don't know what exactly they are, nor how to install them. Are there any other options I have not yet exhausted to be able to boot back into Windows, in the case that there is a better way? I want to set the bootloader to boot into Windows 8, but booting into either Windows 7 or 8 is fine (I can use EasyBCD from there). Is there a simple solution to this? I've checked BIOS, and I haven't been able to find a way to boot into Windows.

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• Integration error in high velocity

  - by Elektito

  I've implemented a simple simulation of two planets (simple 2D disks really) in which the only force is gravity and there is also collision detection/response (collisions are completely elastic). I can launch one planet into orbit of the other just fine. The collision detection code though does not work so well. I noticed that when one planet hits the other in a free fall it speeds backward and goes much higher than its original position. Some poking around convinced me that the simplistic Euler integration is causing the error. Consider this case. One object has a mass of 1kg and the other has a mass equal to earth. Say the object is 10 meters above ground. Assume that our dt (delta t) is 1 second. The object goes to the height of 9 meters at the end of the first iteration, 7 at the end of the second, 4 at the end of the third and 0 at the end of the fourth iteration. At this points it hits the ground and bounces back with the speed of 10 meters per second. The problem is with dt=1, on the first iteration it bounces back to a height of 10. It takes several more steps to make the object change its course. So my question is, what integration method can I use which fixes this problem. Should I split dt to smaller pieces when velocity is high? Or should I use another method altogether? What method do you suggest? EDIT: You can see the source code here at github:https://github.com/elektito/diskworld/

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• What is causing my newly built PC with Windows 7 to BSOD?

  - by Ben S

  I recently built my own PC from parts and installed Windows 7 and I have been getting BSODs with various different stop codes. The latest was 0x24, but I've also had 0xd1 and 0x1e. However, Windows does not let me know where the fault occurred, so I have no idea how to go about resolving this. I know the cause is likely a hardware driver, but I don't know which and cannot find information about how to use the minidumps to troubleshoot my problem. I've uploaded the last three minidumps in case someone can make sense out of them and let me know what could be causing my BSODs. Thanks, Ben

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• 2D Collision masks for handling slopes

  - by JiminyCricket

  I've been looking at the example at: http://create.msdn.com/en-US/education/catalog/tutorial/collision_2d_perpixel and am trying to figure out how to adjust the sprite once a collision has been detected. As David suggested at XNA 4.0 2D sidescroller variable terrain heightmap for walking/collision, I made a few sensor points (feet, sides, bottom center, etc.) and can easily detect when these points actually collide with non-transparent portions of a second texture (simple slope). I'm having trouble with the algorithm of how I would actually adjust the sprite position based on a collision. Say I detect a collision with the slope at the sprite's right foot. How can I scan the slope texture data to find the Y position to place the sprite's foot so it is no longer inside the slope? The way it is stored as a 1D array in the example is a bit confusing, should I try to store the data as a 2D array instead? For test purposes, I'm thinking of just using the slope texture alpha itself as a primitive and easy collision mask (no grass bits or anything besides a simple non-linear slope). Then, as in the example, I find the coordinates of any collisions between the slope texture and the sprite's sensors and mark these special sensor collisions as having occurred. Finally, in the case of moving up a slope, I would scan for the first transparent pixel above (in the texture's Ys at that X) the right foot collision point and set that as the new height of the sprite. I'm a little unclear also on when I should make these adjustments. Collisions are checked on every game.update() so would I quickly change the position of the sprite before the next update is called? I also noticed several people mention that it's best to separate collision checks horizontally and vertically, why is that exactly? Open to any suggestions if this is an inefficient or inaccurate way of handling this. I wish MSDN had provided an example of something like this, I didn't know it would be so much more complex than NES Mario style pure box platforming!

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