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• Check if the vector is behind another or maybe opposite directions?

  - by Gilson

  I'm doing a network game and on the client side, i interpolate the client position with the server sent extrapolated position. The client has its own physics simulation wich is corrected by the server in steps. The problem is when it laggs and i 'kick' the ball, the server gets a delayed message and sends me the position backwards of the client position wich makes the ball goes back and forth. I want to ignore those and maybe compensate that on the server, not sure though. The problem is the clock difference on those case are 0.07ms or 0.10 ms wich isn't that high to ignore the message i guess. When i get the server position, i extrapolate with the clock interval * serverBallVelocity Can i check if my new ball server position is behind my actual ball vector position? I tried to use the dot product after normalized the two vectors to check if they are opposite but it ain't working properly. Any suggestions on checking that?

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• App Engine charges in November 2011 [closed]

  - by broiyan

  I had a billing enabled test application on Google App Engine left over from early 2011. I have not received a bill in many months because I have not been hitting the URL and according to the activity monitor, nobody has. Then unexpectedly in November 2011, I received 2 bills in as many weeks for quite minimal amounts. Checking the monitor it looks like nobody has been hitting the URL and according to the SQL-like search, there is nothing in the Datastore. I know that GAE has left the "preview" in recent weeks but I am not sure how that would affect what is essentially a dormant application with no Datastore objects. Has GAE started charging for completely unused applications in recent weeks? Edit: Most of my applications were already disabled and I have just disabled the only one that was enabled but unused the past several months. If I get another bill next week that should be informative.

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• Does tweeting 9 to 5 hurt job applicants?

  - by evadeflow

  If you were looking into a job applicant's background and discovered that he or she has 1200 followers on Twitter and averages 50 tweets per day (more than half of which are during business hours), would it affect your hiring decision? How and why? Personally, I'd be a little worried about the candidate's ability to focus on the job at hand if they're constantly checking in with their 'tweeps' thoughout the day. In non-tech jobs, a lot of companies simply block Twitter as an irrelevant distraction. But it can be a useful resource---to programmers in particular. I just wonder how much is too much. At what point does it become a red flag?

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• nfs mountpoint named ``share'' breaks ls and man

  - by freddyb

  I mounted a nfs server to ~/share. This works fine as long as I'm at home, where the nfs share is in reach. Whenver I'm not, this seems to break access to all manpages. Using man (or ls in my homedir) waits forever. Checking with strace reveals that they try to access the folder called share. Unmounting fails too. Even with -l (lazy) and -f (force). I am asking for three things here: Is ``share'' a magic name? Does something like MANPATH exist, which I should avoid? How do I unmount without rebooting? (I already commented the share out in fstab) What would you suggest me to do, to have network/position based mounting of NFS shares?

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• Validation and Verification explanation (Boehm) - I cannot understand its point

  - by user970696

  Hopefully my last thread about V&V as I found the B.Boehm is text which I just do not understand well (likely my technical English is not that good). http://csse.usc.edu/csse/TECHRPTS/1979/usccse79-501/usccse79-501.pdf Basically he says that verification is about checking that products derived from requirements baseline must correspond to it and that deviation leads only to changes in these derived products (design, code). But he says it begins with design and ends with acceptance tests (you can check the V model inside). The thing is, I have accepted ISO12207 in terms of all testing is validation, yet it does not make any sense here. In order to be sure the product complies with requirements (acceptance test) I need to test it. Also it says that validation problems means that requirements are bad and needs to be changed - which does not happen with testing that testers do, who just checks correspondence with requirements.

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• Secure Open Source?

  - by opatachibueze

  I want to make a delicate application of mine (an antivirus actually) open source but I want to have a control on who really obtains the source or not. Preferably they should apply and I or administrators approve their applications. Is there any online platform for this? The main reason for the control/security is to possibly prevent malware makers to easily discover how to bypass the stealth checking methods it utilizes for malware detection. Edit: I am looking for advice - possibly to hear from someone who has done something similar. Thanks!

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• Should I use a unit testing framework to validate XML documents?

  - by christofr

  From http://www.w3.org/XML/Schema: [XML Schemas] provide a means for defining the structure, content and semantics of XML documents. I'm using an XML Schema (XSD) to validate several large XML documents. While I'm finding plenty of support within XSD for checking the structure of my documents, there are no procedural if/else features that allow me to say, for instance, If Country is USA, then Zipcode cannot be empty. I'm comfortable using unit testing frameworks, and could quite happily use a framework to test content integrity. Am I asking for trouble doing it this way, rather than an alternative approach? Has anybody tried this with good / bad results? -- Edit: I didn't include this information to keep it technology agnostic, but I would be using C# / Linq / xUnit for deserialization / testing.

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• Where would you start if you were trying to solve this PDF classification problem?

  - by burtonic

  We are crawling and downloading lots of companies' PDFs and trying to pick out the ones that are Annual Reports. Such reports can be downloaded from most companies' investor-relations pages. The PDFs are scanned and the database is populated with, among other things, the: Title Contents (full text) Page count Word count Orientation First line Using this data we are checking for the obvious phrases such as: Annual report Financial statement Quarterly report Interim report Then recording the frequency of these phrases and others. So far we have around 350,000 PDFs to scan and a training set of 4,000 documents that have been manually classified as either a report or not. We are experimenting with a number of different approaches including Bayesian classifiers and weighting the different factors available. We are building the classifier in Ruby. My question is: if you were thinking about this problem, where would you start?

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• Factory for arrays of objects in python

  - by Vorac

  Ok, the title might be a little misleading. I have a Window class that draws widgets inside itself in the constructor. The widgets are all of the same type. So I pass a list of dictionaries, which contain the parameters for each widget. This works quite nicely, but I am worried that the interface to callers is obfuscated. That is, in order to use Window, one has to study the class, construct a correct list of dictionaries, and then call the constructor with only one parameter - widgets_params. Is this good or bad design? What alternatives does the python syntax provide?

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• Is it possible to have a mutable type that is not garbage collected?

  - by user136109

  I'm wondering if such a thing can exist. Can there be an object that is mutable but not flagged as garbage collected ( specifically, tp_flags & Py_TPFLAGS_HAVE_GC ) I have a C++ struct-like object that I'm writing and I'd like to know if all of its members are immutable. I'm thinking of checking for the Py_TPFLAGS_HAVE_GC flag to determine this. If all members are immutable I want to speed up the deepcopy by doing a faster shallow copy, since I know members are immutable then it shouldn't have to go through an expensive deep copy. Is this logically sound, or is there some mythical type that will blow me out of the water here.

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• Should Scala IDE Worksheets be part of your open git repository?

  - by JacobusR

  Those familiar with Scala IDE will know about the great testing environment offered by the Scala Worksheet. You can scribble and scratch, much like in the REPL, but with all the goodness added by the IDE as a whole (refactoring, saving, error checking, etc). When you create a worksheet, it is created with the .sc extension, and also creates a artifact under a hidden directory called .worksheet. This is all fine and dandy, but should one include these in your public .git repositories? People who does not use Scala IDE (or older versions) may find these files confusing. On the other hand, making some of your experiments public to developers who are using Scala IDE, may give them a quick start into experimenting and learning the project.

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• Best method in PHP for the Error Handling ? Convert all PHP errors (warnings notices etc) to exceptions?

  - by user1179459

  What is the best method in PHP for the Error Handling ? is there a way in PHP to Convert all PHP errors (warnings notices etc) to exceptions ? what the best way/practise to error handling ? again: if we overuse exceptions (i.e. try/catch) in many situations, i think application will be halted unnecessary. for a simple error checking we can use return false; but it may be cluttering the coding with many if else conditions. what do you guys suggest ?

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• Inventory Item Exist checker

  - by Annalyne

  I have a question regarding declaring my inventory. I made it a string named inventory, with a constant number as its max value. The thing is, I want the user to use an item if he / she gains an item. The problem is, I do not know what syntax should I use to determine if the user has an item and use that item. Here's my code I just started: so declaring the inventory: const int MAX_ITEMS = 15; string game_inventory [MAX_ITEMS]; int itemnum = 0; I have some items like potion, antidote, gems and others. I use the: game_inventory[itemnum++] = "Potion" to place items in my inventory. If I want to use the potion, IF I HAVE one, how can i make a function to check whether I have a potion or anything and use it?

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• Daemon for moving files between partitions?

  - by RATHI

  I have a system with Ubuntu installed in 20GB and windows in 100 GB, two partitions - each of 100GB using NTFS. While using DC++ (multiple downloading of big file) I used to get message that system is running out of memory. Is there any way to make a deamon which will be checking the Ubuntu partition so that if its used space goes up to a certain amount (let's say 18 GB) it will automatically start a moving file from this drive to another drive (let's assume it will pick the file from movie folder or largest media file from this drive to move)? Or it prompt to ask from user which file to move? Is there any program which can do this for me? If not, can you suggest something to read so that I could make it?

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• The imported project "C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v10.0\SSDT\Microsoft.Data.Tools.Schema.SqlTasks.targets" was not found. Confirm that the path in the <Import> declaration is correct, and that the file exists on di

  - by simonsabin

  Are you trying to build a SQL Server database project and getting   The imported project "C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v10.0\SSDT\Microsoft.Data.Tools.Schema.SqlTasks.targets" was not found. Confirm that the path in the <Import> declaration is correct, and that the file exists on disk. We had this recently when trying to build one SSDT solution but not when building another.   Checking the build agent the error was correct that file didn’t exist...(read more)

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• How can I redirect any kind of access to my site to somewhere else, except for me?

  - by Omega

  My site, www.example.com has a MyBB forum installation, and has many users constantly checking it out. I would like to make a major change to it - basically, I want to delete everything it has and start clean. However, this rebuilding process may take me hours since I need to do a lot of things. Thus, whenever an user tries to enter any part of my site (www.example.com, www.example.com/blog etc), the user will always be redirected to www.example.com/underconstruction so they can see a nice HTML site explaining the current situation. But not only that - while I am configuring my site, I need to visit it myself to make sure things do work live. So basically, it has to redirect everyone who isn't me. Is that possible in any way? I am using GoDaddy hosting.

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• ASUS Xonar DG not working Ubuntu

  - by thephpdev

  I've checked the "Questions that may already have your answer" to no avail. Basically, there is no sound at all, the snd_oxygen drivers are all being loaded. I can see the sound card and all of it's separate ports in Settings-Sound-Output, but nothing is coming out. I tried adjusting the volume in alsamixer, but for some reason the volume won't change (all that is there are some options [Speakers, Headphones, FP Headphones] and they change when I press the up/down arrow keys) at all. I have also tried many other terminal commands, such as reloading alsa and checking if the sound card is even being detected, which it is. I'm left clueless. It says on a bug report that this has been unassigned for over a year. Surely that's not right. Thanks in advance, Caelan.

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• C++ Game Engine Book/Tutorial/Anything recent?

  - by TheNoob

  Before I get flamed, please understand that I have been looking for a while now. Yes, I have found a good amount of game engine tutorials...except filled with errors, out of date syntax, missing crucial information, and so on. Is there anywhere with a recent tutorial, or a book, anything at all? I'm not asking for an opinion in graphics API's, just a point in the right direction to get started on game engine development. I just want to make it clear, I have googled/stacked like crazy. Any help appreciated. Thank you.

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• Why should I use a web framework's template language over python's templating options?

  - by stariz77

  I'm coming from a python CGI background and was wanting to move into something more contemporary and think I have decided upon web.py as the framework I would like to use. In regards to templating, previously I used formatted strings and the string.Template module to effect most of my templating needs. After reading through a few of the templating options I have heard mentioned, I began wondering what the main benefits of using something like the Django or jinja templating options over "native" Python templating options were? Am I just going to be replacing $tmpl_var with {{ tmpl_var }} and s.substitute(tmpl_var=value) with t.render(s), i.e., alternate syntax? or will I gain additional advantages from using these templating systems?

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• Starting Game Programming in C++, where to begin for optimal cross-platform development?

  - by Qasim

  I wish to begin learning game development in C++. I have knowledge in syntax and the console using Visual C++ 2010, however I want to begin programming. My only problem is that I want to be able to support many platforms including Windows, Mac OS, and Linux. As I get better, I also hope I can submit games to XBLIG (or XBLA) and Steam, and even the Google Play Store (But that would take some porting and major redesign of controls). I have looked into c++ and SDL but I have no idea how to get started. I have Visual C++ 2010 installed and I hope I can still use that as other C++ IDEs are quit outdated. Because I want to stick with Visual C++ and SDL (unless there is a better library than SDL), there is not much room for debate but rather how to create projects to support cross-platform development.

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• What environmental factors do you believe contribute to productivity?

  - by Pemdas

  From the perspective of a developer what do you consider to be the most important environmental factors or work place perks/policies that contribute to increase productivity? For example, my top four includes the following: No internet restrictions - Because honestly ever few hours I need a 15 min deload, which usually involves checking my gmail account and or browsing a few choice site. Personal office with a door - for obvious reasons Dual monitors - do people really develop software with one monitor still? Flexible hours - This could be interpreted in different ways, but basically I really appreciate that fact that I can roll into work at 7am, 11am or whenever and the time police aren't on my back. It is just understood that I will put in my 8 hours or more if needed and get my job done however that works out.

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• How to ensure that a member variable is initialized before calling a class method

  - by Omkar Ekbote

  There's a class with a parametrized constructor that initializes a member variable. All public methods of the class then use this member variable to do something. I want to ensure that the caller always creates an object using the parametrized constructor (there is also a setter for this member variable) and then call that object's methods. In essence, it should be impossible for the caller to call any method without setting a value to the member variable (either by using the parametrized constructor or the setter). Currently, a caller can simply make an object using the default constructor and then call that object's method - I want to avoid checking whether or not the member variable is set in each and every one of the 20-odd methods of the class (and throw an exception if it is not). Though a runtime solution is acceptable (better than the one I mentioned above); a compile-time solution is preferable so that any developer will not be allowed to make that mistake and then waste hours debuggging it!

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• Installed nvidia graphics driver (current, 8800GTX) has issues, how do I disable/uninstall it?

  - by Craig

  I installed the restricted nvidia graphics driver (current) on my computer, then restarted to finish the install. Upon reboot I got some prompt about there being an X server problem, It told me to try auto-fixing or something, none of its options worked, they all failed horribly and caused the computer to crash immediately on selecting any of them. I decided to re-install. Again I got in, downloaded updates, and installed the driver. This time upon boot the X-server immediately crashes and im brought to tty1. If I hit ctrl+alt+F7 I see a beige-background prompt says the usual about checking battery state, pulse audio etc., you see right before the x-server starts. According to X (if I do sudo startx) there are no displays, and the nvidia graphics driver is not working. First off, how do I set ubuntu back to the default driver (I have only a CLI right now -.-), then how do I install a more appropriate nvidia driver

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• wine: x development files not found

  - by Subin

  I downloaded the wine-1.4-rc5.tar.bz2. I ran the tools/wineinstall in terminal. After some time I get this error. checking for X... no configure: error: X development files not found. Wine will be built without X support, which probably isn't what you want. You will need to install development packages of Xlib/Xfree86 at the very least. Use the --without-x option if you really want this. Configure failed, aborting install. I am using Ubuntu 10.04. The installation won't finish. Can I fix this and make wine install ?

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• How to run/test JavaScript? [closed]

  - by user702

  I'm reading David Flanagan's "JavaScript: The Definitive Guide, 6th ed". It only actually tells users how to run JS code on page 311, where users are told of the following solutions: "Client-side JavaScript code is embedded within HTML documents in four ways: Inline, between a pair of <script> and </script> tags From an external file specified by the src attribute in a <script> tag In an HTML event handler attribute, such as onclick or onmouseover In a URL that uses the special javascript: protocol." I was wondering what professional JS developers use to write and test their code: Do they use a good text editor with syntax high-lighting + autocompletion, hit F5 in the browser to reload the page every time they make a change, and use some add-on in the browser to investigate errors? Or are there full-fledged IDE's similar to MS VisualStudio for non-web languages?

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