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• When profiling a function for time use, what information is desirable?

  - by AaronMcSmooth

  I'm writing a program similar to Python's timeit module. The idea is to time a function by executing it anywhere from 10 to 100,000 times depending on how long it takes and then report results. I've read that the most important number is the minimum execution time because this is the number that best reflects how fast the machine can run the code in question in the absence of other programs competing for processor time and memory. This argument makes sense to me. Would you be happy with this? Would you want to know the average time or the standard deviation? Is there some other measure that you consider more important?

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• Are "skip deltas" unique to svn?

  - by echinodermata

  The good folks who created the SVN version control system use a structure they refer to as "skip deltas" to store the revision history of files internally. A revision is stored as a delta against an earlier revision. However, revision N is not necessarily stored as a delta against revision N-1, like this: 0 <- 1 <- 2 <- 3 <- 4 <- 5 <- 6 <- 7 <- 8 <- 9 Instead, revision N is stored as a delta against N-f(N), where f(N) is the greatest power of two that divides N: 0 <- 1 2 <- 3 4 <- 5 6 <- 7 0 <------ 2 4 <------ 6 0 <---------------- 4 0 <------------------------------------ 8 <- 9 (Superficially it looks like a skip list but really it's not that similar - for instance, skip deltas are not interested in supporting insertion in the middle of the list.) You can read more about it here. My question is: Do other systems use skip deltas? Were skip deltas known/used/published before SVN, or did the creators of SVN invent it themselves?

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• Is it possible to procedurally place objects in a non-gridded game?

  - by nickbadal

  I'd like to implement procedural world generation, but I don't want it to look gridded or blocky, where everything is obviously placed on an integer grid. I know that you can do this in gridded worlds by inputting a square's x and y into a noise function, or similar, but is it possible to generate a more natural looking object placement using procedural methods? This is in the context of an adventure game, if it matters. Edit: I guess I should have been a bit more clear in my original question, but I'm mostly wondering about the actual placement of objects in game, e.g. trees, buildings.

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• Gnome-classic, new windows remain buried behind other window

  - by Naten Baptista

  This is my first question on this forum. I have recently moved from ARCH Linux to Ubuntu 11.10. I switched to using Gnome-Classic and noticed strange behaviors with the windows whenever I open them. I have setup Launchers on the Panel to launch Dolphin, Terminal and Chrome Browser. Whenever I launch any of these I notice that they open behind the current window that is in-focus instead of coming up in front. According to me any sane windows manager would by default bring up the new window in front and focus, I mean why would you want to open a window hidden behind all other window??? Is there any thing or configuration that I need to check as this problem is driving me nutts . Thanks in advance

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• Webmatrix fails to connect PHP website to MySQL

  - by Roni

  I downloaded the latest versions of Webmatrix and MySQL. I downloaded a PHP-MySQL Connector: http://dev.mysql.com/downloads/connector/php-mysqlnd/ In the "Databases" Workspace I pressed "New Connection" button and choose "MySQL Connection" In the Dialog box I filled-in all connection details -- It looks like the database was added. But then when I double-click on the database, I get a short error message saying it cannot connect. I tried everything, searched the web... I'm sure it's a very simple question, so please whoever can help I'll be grateful. I think best solution for me would be if someone could please just give me a link to download of: Webmatrix,MySQL,Connector; and instructions on how to install and then how to connect. This would be the safest way to help me.

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• Schema.org for Product Reviews

  - by Lynda

  I have a product reviews on a site and I am adding schema.org markup to the reviews. Here is the code I am using: <div class="blockquote-wrap"> <blockquote itemprop="review" itemscope itemtype="http://schema.org/Review"><span itemprop="reviewBody">Text of the review itself.</span> <cite><span itemprop="author">Author Name</span>, Location of Author</cite> </blockquote> </div> This is all the reviews are. When I test the page using Google's Structured Data Testing Tool I receive this error: Error: Incomplete microdata with schema.org. My question is what data is missing that is required? I don't see which data is required on the Schema.org page for reviews.

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• Wi-Fi Connection Issues.. tried a lot.. pls help

  - by nikvana

  I am posting a question for the first time, do not know coding and am relatively new to ubuntu, but a quick learner. I have an Acer Aspire One D270 notebook that came originally with Windows 7 starter installed. I have removed that and installed Ubuntu 12.04 I have chronic issues with connecting to the wi-fi. I figure it is due to issues with the driver(s) I think this is the driver I have- BCM4313 802.11bgn Wireless Network Adapter (on entering this in the terminal- lshw -C) I also installed the software Windows wireless drivers and it shows currently installed drivers as blank- but when i choose install new drivers, it asks me to select inf file which I do not know where to find. Please help with this, coders. Thanks a ton

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• Is it possible to change the group list shown on the application launcher?

  - by Grobbendonk

  I just installed Unity, on Ubuntu 10.10, to try it out. I've tried fiddling with a few things, but I can't work out how the applications are grouped and listed. I mean - if I click on the Applications in the launcher, we get the list of applications installed, with the option to narrow the selection by group. i.e. |Search box|All applications|Accessories|Games|Internet|Media|Office|System| My question is where that list is generated - my machine is mostly for work, so the games have been uninstalled (and I get a "there are no games on this box" message, which is nice), and there's a stack of other stuff I'd like to see under a new group of "work" or something. Obviously, a logical follow-up - how does unity know how to classify the applications into those groups? Is it the info in the .desktop links to them?

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• What Part of Your Project Should be in Source Code Control?

  - by muffinista

  A fellow developer has started work on a new Drupal project, and the sysadmin has suggested that they should only put the sites/default subdirectory in source control, because it "will make updates easily scriptable." Setting aside that somewhat dubious claim, it raises another question -- what files should be under source control? And is there a situation where some large chunk of files should be excluded? My opinion is that the entire tree for the project should be under control, and this would be true for a Drupal project, rails, or anything else. This seems like a no-brainer -- you clearly need versioning for your framework as much as you do for any custom code you write. That said, I would love to get other opinions on this. Are there any arguments for not having everything under control? Is this sysadmin a BOFH?

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• Prediction happening on (sending) client side

  - by Daniel

  This seems like a simple enough concept, but I haven't seen this implemented anywhere yet. Assuming that the server just forwards and verifies data... I'm using mouse-based movement, so it's not too difficult to predict the location of the player 150ms from when the event is sent. I'm thinking it is more accurate than using old data and older data on the receiving clients' side. The question I have, is why can I not find any examples of this? Is there something fundamentally wrong with this that I cannot find anyone implementing or talking about implementing this.

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• Experience embedding javascript

  - by deft_code

  I'm looking into scripting languages to embed in my game. I've always assumed Lua was the best choice, but I've read some recent news about embedding V8 as was considering using it instead. My question is two fold: Does anyone with experience embedding v8 (or another javascript engine) recommend it? How does it compare with embedding Lua? I like that v8 has a c++ embedding API. However Lua API has had lots of time to be refined (newer isn't always better and all that). Note: At this point I'm not too concerned with which is better language or which library has better performance. I'm only asking about ease of embedding.

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• BIOS Always Freezes Instantly

  - by Louis

  I'm not sure if this is necessarily a Ubuntu question, but I've only had the problem since I installed 12.10. When I turn my computer on, the BIOS screen comes up as usual and... nothing else. When I press any key, I hear a loud beep and there's no response. I've tried looking for similar problems, but in most cases people are at least able to interact with their BIOS even if their OS doesn't load. It seems as though it's just completely freezing as soon as I turn it on.

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• Etes-vous satisfait de Free Mobile ? Participez à notre sondage et aidez-nous à mieux évaluer la qualité du service du nouvel opérateur

  Etes-vous entièrement satisfait de Free Mobile ? Participez à notre sondage pour mieux évaluer la qualité du service du nouvel opérateur Free Mobile fonctionne. C'est un fait. Mais Free Mobile fonctionne quelquefois mal. Les uns diront qu'il faut lui laisser du temps. Les autres que Xavier Niel a fait trop de promesses, trop tôt. [IMG]http://ftp-developpez.com/gordon-fowler/FreeMobile/Free%20Mobile%202.png[/IMG] Loin de nous l'idée de trancher cette question. Mais une anecdote, survenue hier soir, nous a poussé à vous demander voter avis sur le sujet. Abonné à Free Mobile, un membre de la rédaction a essayé de passer un appel à u...

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• How to hide process arguments from other users?

  - by poolie

  A while ago, I used to use the grsecurity kernel patches, which had an option to hide process arguments from other non-root users. Basically this just made /proc/*/cmdline be mode 0600, and ps handles that properly by showing that the process exists but not its arguments. This is kind of nice if someone on a multiuser machine is running say vi christmas-presents.txt, to use the canonical example. Is there any supported way to do this in Ubuntu, other than by installing a new kernel? (I'm familiar with the technique that lets individual programs alter their argv, but most programs don't do that and anyhow it is racy. This stackoverflow user seems to be asking the same question, but actually just seems very confused.)

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• Given two sets of DNA, what does it take to computationally "grow" that person from a fertilised egg and see what they become? [closed]

  - by Nicholas Hill

  My question is essentially entirely in the title, but let me add some points to prevent some "why on earth would you want to do that" sort of answers: This is more of a mind experiment than an attempt to implement real software. For fun. Don't worry about computational speed or the number of available memory bytes. Computers get faster and better all of the time. Imagine we have two data files: Mother.dna and Father.dna. What else would be required? (Bonus point for someone who tells me approx how many GB each file will be, and if the size of the files are exactly the same number of bytes for everyone alive on Earth!) There would ideally need to be a way to see what the egg becomes as it becomes a human adult. If you fancy, feel free to outline the design. I am initially thinking that there'd need to be some sort of volumetric voxel-based 3D environment for simulation purposes.

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• What is "egoless programming"?

  - by Bob Murphy

  I first heard this term about fifteen years ago. My understanding is similar to that described in the Wikipedia article and a TechRepublic article: you work with your colleagues in a "friendly, collegiate way in which personal feelings are put aside". It includes things like doing peer reviews with mutual respect and a desire to learn, and not feeling like you "own" code, so if somebody has a suggestion or says there's a bug or needs to change it, you don't get defensive about it. I've also thought it was largely about having an attitude that makes for good relations with other programmers with the goal of improving the code. So I haven't seen it as being incompatible with taking pride in the quality of your work or feeling regret if something you did caused your customer a problem. However, an answer to a recent question makes me think some other programmers have different understandings about "egoless programming". So what is the correct definition? And what are its implications?

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• Assemble static site from templates? (don't want to reinvent the wheel)

  - by raindog308

  I have a site that is 100% static content (no php, just some javascript). There's several "blocks" like the header, menu, footer, etc. that are the same on each page. Rather than do a lot of copy/pasting, I was thinking of some kind of template system where I could run a CLI command (in php, perl, python, shell, whatever) and have it replace all the block tags with the actual block text. I did see some answers in this question, but those seem oriented towards "we provide the style and layout, you provide the text". In my case, I have everything as far as layout, css, etc. - just want to do a glorified sed. Before I invent the wheel, I was wondering if there was a tool out there already.

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• How to handle a Tile Map Scrolling [duplicate]

  - by DGomez

  This question already has an answer here: Implementing a camera / viewport to a 2D game 1 answer i'm making a video game, and i'm having, i think, a concept problem. The game will be a platformer which will use tile maps, so to start i will create a mask matrix indicating the tiles to be loaded, and etc..., so my problem is, how to handle the scrolling? should i create a giant mask matrix indicating in each position of the whole level what is supposed to be loaded, and according to the position of the player, change the section to be drawed?? Is this a correct approach to this situation??

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• How to design Character,Game Background.,Which Software to use?

  - by TicTech

  Yesterday i Downloaded 4 GB of Videos & ZBrush for Character design but now i realize that i want to make 2D Character and background for my Android Game. so it was a waste for me i don't want to waste my other bandwidth and my Energy on some other Tut. So i am Here for a advice my Question is. 1.Which software to draw and color Character, making Background ? 2.Is there any Video Tut or Ebook for the software to draw Character .i know Basic of Photoshop i learned from Lynda Please help me i am experienced in Android SDK so that's not a prob. for me but in designing i don't know anything any Help will be Really Appreciated Thanks.

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• Are there any surveys on to what degree developers like or hate scrum ?

  - by dparnas

  Background: During a conference an analyst pointed out in a tweet that developers hate scrum. Myself and another person responded that this was not the case, and started discussing different scenarios on why developers would dislike scrum. One of the scenarios where that lazy developers are not able to hide in a scrum project. They are constantly challenged by the team to contribute. This discussion resulted in a blog post and video http://elsewhat.com/2010/05/20/lazy-developers-hate-agile-and%C2%A0scrum/ I've gotten three comments which I've tried to answer in a neutral way, but they comments do point out that there are some people who loathe scrum (and I am always 100% certain they are not lazy developers). Question Have there ever been a survey among developers on to what degree developers like or hate scrum ?

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• matrix to transform unit cube to space defined by 8 arbitrary points

  - by aadster

  I asked a question relating to similar to this already, but I think this is a clearer objective of what Im trying to achieve.. or whether its possible at all! Im trying to find a transformation (matrix ideally) which would transform the 8 points of a 3d unit cube to 8 arbitrary points in space. The 8 target points have no known structure. e.g: My gut feeling is that a matrix is unable to provide this xform since the cube faces vertices can be concave.. but are there any other methods of transformation? Thanks!

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• From Java to Javascript? [duplicate]

  - by theGreenCabbage

  This question already has an answer here: Are there any OO-principles that are practically applicable for Javascript? 2 answers I am primarily a Java programmer. Because of its OO principles and the general paradigm of Java programming, like wrapping things in static variables, and having things return specific types, heavily aids me in "visualizing" a program. Instead of thinking of a big program, I can, instead, focus on smaller organized parts of my eventual program, and add functionality and build up from there. Thus, I have trouble programming in other languages. Or at least, I have not been able to program in the same ability as I do in Java compared to other languages. I know Javascript has OO principles, so I'd like to learn this language in a OO-based like I would program with Java. Is this possible?

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• Can I run alsa and pulse side by side ? I think there is some problem with the alsa ! My ubunu login sound and alert sound are not working?

  - by Curious Apprentice

  I think I have Alsa driver installed. Pulse not working may be I dont have it installed. Not sure If I can run Pulse and Alsa. I had to configure each application prior to work which use pulse.(SMplayer by default select pulse. I had to change that) I know a little about these. So if the question is stupid then please help me. Smplayer always showing a cross(x) icon in front of speaker icon as it is disabled, though Im playing sound.

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• Randomly spawning bitmaps on cnvas

  - by Toystoj

  I need some ideas in order to finish algorithm. I'm randomly placing objects (bitmaps) on canvas without overlapping. Time needed to finish it is my problem. When I need to spawn for example 80% of canvas it takes to long. So i was thinking : I should make some change when the bitmaps take off 50 % of canvas. I want to tell algorithm that it should generate new locations (x,y) where it is free space. My question is : How to render new location (x,y) in place where is free space. In summary: Things I know : object location (x,y) 4 corners (x,y) of object object width, height canvas width, height Any suggestions?

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• GPG and libpcap help

  - by Johnq

  I was trying to install the newest version of libpcap (as the version in the repositories doesn't seem current) and ran into the following problem. I copied the tcpdump-workers.asc text from the tcpdump website (which hosts libpcap as well) and imported the key to my keyring using gpg --import tcpdump-workers.asc. That when all well and fine but when I tried to verify the libpcap-1.4.0.tar.gz file against the key with gpg --verify, I ended up getting the message that unexpected data. was found. I am wondering if anyone else has run into this problem as the ancient technique of googling my problem has done little to answer my question.

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