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• When a python process is killed on OSX, why doesn't it kill the child processes?

  - by Hugh

  I found myself getting very confused a while back by some changes that I found when moving Python scripts from Linux over to OSX... On Linux, if a python script has called os.system(), and the calling process is killed, the called process will be killed at the same time. On OSX, however, if the main process is killed, anything that it launched is left behind. Is there something somewhere in OSX/Python where I can change this behaviour? This is causing problems on our render farm, where the processes can be killed from the management GUI, but the top level process is really just a wrapper, so, while the render farm management might think that the process has gone and the machine is freed up for another task, the actual processor-intensive task is still running, which can lead to huge blockages. I know that I could write more logic to catch the kill signal and pass it on to the child processes, but I was hoping that it might be something that could be enabled at a lower level.

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• Unable to open Synaptic manager, unable to install packages, what can I do?

  - by Omkant

  I have installed the sun java6-jdk package but it's not installed completely. After that it's giving an error when I try to install a new package. In terminal when I write "sudo apt-get install [any package name]" I get an error like this: E: could not get lock /var/lib/dpkg/lock -open (11 Resource temporable ) E: Unable to lock the administration directory (/var/lib/dpkg). Also Synaptic package manager is not opening and none of the packages are downloading through any of the methods I know. Please help!

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• how to save and load the state of a game in scheme

  - by user3667664

  I'm creating the game of chess in scheme, but do not know how to save and load game state is a part I have this code (define-struct ficha(color se-movio? tipo-ficha )) ;;tablero lista de listas de fichas (define-struct estado (tablero turno fichaSel)) (define bpawn (bitmap "b-peon.png")) (define brook (bitmap "b-torre.png")) (define bcaballo (bitmap "b-caballo.png")) (define bbish (bitmap "b-arfil.png")) (define bquee (bitmap "b-reina.png")) (define bking (bitmap "b-rey.png")) (define wpawn (bitmap "w-peon.png")) (define wrook (bitmap "w-torre.png")) (define wcaballo (bitmap "w-caballo.png")) (define wbish (bitmap "w-arfil.png")) (define wquee (bitmap "w-reina.png")) (define wking (bitmap "w-rey.png")) (define board (bitmap "board.jpg")) This is the board that is a list of lists (define tableroini (list (list torreb caballob arfilb reinab reyb arfilb caballob torreb) (list peonb peonb peonb peonb peonb peonb peonb peonb) (list empty empty empty empty empty empty empty empty) (list empty empty empty empty empty empty empty empty) (list empty empty empty empty empty empty empty empty) (list empty empty empty empty empty empty empty empty) (list peonw peonw peonw peonw peonw peonw peonw peonw) (list torrew caballow arfilw reinaw reyw arfilw caballow torrew))) I did this to save the state of the game: (define (Guardar-en-archivo archivo) (write-file (string-append Subcarpeta archivo ".txt") "game state" )) But not as you insert the game state on "game state" for me to save the game How I can do this ?

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• Design guideline for saving big byte stream in c# [migrated]

  - by Praveen

  I have an application where I am receiving big byte array very fast around per 50 miliseconds. The byte array contains some information like file name etc. The data (byte array ) may come from several sources. Each time I receive the data, I have to find the file name and save the data to that file name. I need some guide lines to how should I design it so that it works efficient. Following is my code... public class DataSaver { private static Dictionary<string, FileStream> _dictFileStream; public static void SaveData(byte[] byteArray) { string fileName = GetFileNameFromArray(byteArray); FileStream fs = GetFileStream(fileName); fs.Write(byteArray, 0, byteArray.Length); } private static FileStream GetFileStream(string fileName) { FileStream fs; bool hasStream = _dictFileStream.TryGetValue(fileName, out fs); if (!hasStream) { fs = new FileStream(fileName, FileMode.Append); _dictFileStream.Add(fileName, fs); } return fs; } public static void CloseSaver() { foreach (var key in _dictFileStream.Keys) { _dictFileStream[key].Close(); } } } How can I improve this code ? I need to create a thread maybe to do the saving.

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• Questions about Code Reviews

  - by bamboocha

  My team plans to do Code Review and asked me to make a concept what and how we are going to make our Code Reviews. We are a little group of 6 team members. We use an SVN repository and write programs in different languages (mostly: VB.NET, Java, C#), but the reviews should be also possible for others, yet not defined. Basically I am asking you, how are you doing it, to be more precise I made a list of some questions I got: 1. Peer Meetings vs Ticket System? Would you tend to do meetings with all members, rather than something like a ticket system, where the developer can add a new code change and some or all need to check and approve it? 1. What tool? I made some researches on my own and it showed that Rietveld seems to be the program to use for non-git solutions. Do you agree/disagree and why? 2. A good workflow to follow? 3. Are there good ways to minimize the effort for those meetings even more? 4. What are good questions, every code reviewer should follow? I already made a list with some questions, what would you append/remove? are there any magic numbers in the code? do all variable and method names make sense and are easily understandable? are all querys using prepared statement? are all objects disposed/closed when they are not needed anymore? 5. What are your general experiences with it? What's important? Things to consider/prevent/watch out?

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• Restoring using SyncBack without profiles

  - by Thomas Matthews

  I backed up my internal hard drive (C:) using SyncBack onto an external (USB) hard drive with maximum compression. I then performed a clean install of Windows Vista onto the computer. I forgot to copy the SyncBack logs before the clean install. And now when ever I try to restore a directory, the RAR/ZIP files are copied to the system hard drive instead of extracting their contents to the hard drive. Also, SyncBack is not traversing the folders during the Restore process. How can I tell SyncBack to expand the compressed files? I am running the freeware version of SyncBack. I have to create new log files (unless SyncBack put them somewhere on the external drive). My alternative is to write a program that traverses the folders on the external drive and extracts files from the RAR/ZIP files. I am using Windows Vista, Service Pack 2, and the data size prior to backup was about 200 GB. (The backup process took over 72 hours due to "hiccups").

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• Is there a way to have customised text instead of subject in Thunderbird's inbox list?

  - by peterp

  I am getting a lot of informational emails like "You've got a new message from ..." or "Notification of Donation Received", which often do not contain any information in the subject so that I have to open the email to see who sent the message or who donated which amount. I'd love to be able to make TB parse incoming emails and then display something interesting instead of the original subject, e.g. by defining a regular expression pattern. I know how to write regular expressions, but I do not know whether there is a way or an addon to modify the displayed text in the messages view. EDIT for clarification: I would like donation notifications from Paypal not to be displayed as original Notification of Donation Received but rather Paypal: John Doe has donated 50$

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• Apache log file problem

  - by Luke

  I've recently set up an Apache 2 web server and I noticed a quite a few lines in the error and access log that start with the follow sequence (but longer). Does anyone know where this comes from? ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@ ....... My set up is an Apache 2 load balancer with mod_balancer enabled and two Apache 2 web servers. All three servers write to the same log files on a share located on a NFS. My first guess is that my problem has to do with it since it's the only difference that comes to mind from other set ups I've used in the past but I'm not sure.

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• How to generate user-specific PDF with encrypted hidden watermark?

  - by Dave Jarvis

  Background Using LaTeX to write a book. When a user purchases the book, the PDF will be generated automatically. Problem The PDF should have a watermark that includes the person's name and contact information. Question What software meets the following criteria: Applies encrypted, undetectable watermarks to a PDF Open Source Platform independent (Linux, Windows) Fast (marks a 200 page PDF in under 1 second) Batch processing (exclusively command-line driven) Collusion-attack resistant Non-fragile (e.g., PDF - EPS - PDF still contains the watermark) Well documented (shows example usages) Ideas & Resources Some thoughts and findings: Natural language processing (NLP) watermarks. Apply steganography on a randomly selected image. http://openstego.sourceforge.net/cmdline.html The problem with NLP is that grammatical errors can be introduced. The problem with steganography is that the images are sourced from an image cache, and so recreating that cache with watermarked images will impart a delay when generating the PDF (I could just delete one image from the cache, but that's not an elegant solution). Thank you!

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• Introduction to the ADF Debugger

  - by Shay Shmeltzer

  Not that you'll ever need this blog entry - after all there are never bugs in the code that YOU write. But maybe one day one of your peers will ask you for help debugging their ADF application so here we go... One of the cool features of JDeveloper and ADF is the ADF Debugger - a way to debug the declarative pars of Oracle ADF. The debugger goes beyond your regular Java debugger and shows you in a clear way specific information related to Oracle ADF - things like where are you in the taskflow/region hierarchy, what is in your various scopes, what is the value of a specific EL and much more. However, from the number of posts on OTN where people are saying "I placed a System.out.println() to see what the value was...", it seems that not many are familiar with the power of the debugger. So here is a short demo that shows you some aspects of the debugger such as: Setting breakpoints on various ADF artifacts The ADF structure window The ADF Data window The EL Evaluater window Want to learn more about debugging ADF applications - I highly recommend that you go back in time to 2009 and attend Steve Muench's OOW presentation about ADF debugging. Can't travel in time yet? Then the second best option is to look at his very clear ADF Debugging Slides, which were the inspiration to the above demo.

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• Automatic Site Creation

  - by Eddy Freeman

  I have created a platform that i want users to sign up and a new site is created for them instantly. Users will register and afterwards they will receive a username and password for their personal site. The system will work like ecommerce platforms such as www.shopify.com, www.bigcommerce.com, etc.. where users sign up and a new web-shop is created for them instantly. I have been searching for a while how i can create a script to automate this task but couldn't find any tutorials. Am using LAMP (Linux, Apache, MySql and PHP). Am asking if someone can guide me how to write such script or maybe point me to a tutorial or a book or probably similar scripts to automate this task. Sorry if this place is wrong for this question. thanks for your help.

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• MacOS X 10.6 Portable Home Directory sync fails due to FileSync agent crashing

  - by tegbains

  On one of our cleanly installed MacPro machines running MacOS X 10.6.6 connected to our MacOS X 10.6.6 Server, syncing data using Portable Home Directories fails. It seems to be due to the filesync agent crashing during the home sync. We get -41 and -8026 errors, which we are suspecting are indicating that there is too much data or filesync agent can't read the files. The user is the owner of the files and can read/write to all of the files. < Logout 0:: [11/02/04 13:10:42.751] Error -41 copying /Volumes/RCAUsers/earlpeng/Library/Mail/Mailboxes/email from old imac./Attachments/12081/2.2. (source = NO) < Logout 0:: [11/02/04 13:10:42.758] Error -8062 copying /Volumes/RCAUsers/earlpeng/Library/Mail/Mailboxes/email from old imac./Attachments/12081/2.2/[email protected]. (source = NO) < Logout 1:: [11/02/04 13:10:42.758] -[DeepCopyContext deepCopyError:sourceError:sourceRef:]: error = -8062, wasSource = NO: return shouldContinue = NO

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• Java Applet or Unity3D for Cross-Platform 3D Surveying App

  - by Jake M

  Do you think a Java Applet or Unity3D Application is the best option to make a cross-browser 3d web-app? I intend to make a web application that displays 3d environments that can be navigated by dragging(with a finger or mouse depending on the platform). The web app will render 3d environments of development sites including contours, water pipeline locations, buildings etc. The application must work on Windows Desktop, Android, iOS and Windows Phone. So this is why I am tending towards a web-app as opposed to cross-platform smart phone library(like Mosync or Marmalade). The 3d environments will be navigable(by dragging around) and contain simple(not detailed) 3d objects like buildings, mountains, pipelines, etc. One thing I know is that WebGL is out because it doesn't work on IE and has limited support on Smart Phones(am I correct to completely disregard WebGL?). Will future Smart Phone browsers continue to support Java Applets? Also is it really true I can write ONE Application/Game in Unity3D and simply compile it to run on Windows Windows, Mac, Xbox 360, PlayStation 3, Wii, iPad, iPhone and Android? Would you suggest the Unity3D application path or the Unity3D Web Player path? Concerning Unity3D, there's one thing I am unsure about: do all Unity3D features work on iOS and Android?

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• Which software to keep track of my project?

  - by Exa

  I'm about to start the first real phase of my game development which will consist of the acquisition of information, resources and the definition of where I want to go and what I will need for that. I just want to make sure that I'm prepared as best as possible before I actually start development. I don't like the thought of using Microsoft Word or Excel for my project management... I already worked with MS Project but I don't think it fits my needs. I need a software where I can easily maintain project steps, milestones, important issues, information about technologies and engines I use, as well as simple notes and thoughts I just want to write down. I usually prefer a whiteboard for stuff like that but unfortunately it's not a persistent way of storing. ;) Also writing it down the old-school way is something I can think of, but only for quick notes... Which software do you use for that? Are there commonly used programs? Is there any free software at all?

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• Send less Server Data with "AFK"

  - by Oliver Schöning

  I am working on a 2D (Realtime) MultiPlayer Game. With Construct2 and a Socket.IO JavaScript Server. Right now the code does not include the Array for each Player. var io = require("socket.io").listen(80); var x = 10; io.sockets.on("connection", function (socket) { socket.on("message", function(data) { x = x+1; }); }); setInterval(function() { io.sockets.emit("message", 'Pos,' + x); },100); I noticed a very annoying problem with my server today. It sends my X Coordinates every 100 milliseconds. The Problem was, that when I went into another Browser Tab, the Browser stopped the Game from running. And when I went back, I think the Game had to run through all the packages. Because my Offline Debugging Button still worked immediately and the Online Button only responded after some seconds. So then I changed my Code so that it would only send out an update when it received a player Input: var io = require("socket.io").listen(80); var x = 10; io.sockets.on("connection", function (socket) { socket.on("message", function(data) { x = x+1; io.sockets.emit("message", 'Pos,' + x); }); }); And it Updated Immediately, even when I had been inactive on the Browser Tab for a long time. Confirming my suspicion that it had to get through all the data. Confirm Please! It would be insane to only send information on Client Input in a Real Time Game. But how would I write a AFK function? I would think it is easier to run a AFK Boolean Loop on the Server. Here is what I need help for: playerArray[Me] if ( "Not Given any Input for X amount of Seconds" ) { "Don't send Data" } else { "Send Data" }

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• Executing NUnit Tests using the Visual Studio 2012 Test Runner

  - by David Paquette

  At a recent Visual Studio 2012 event at the Calgary .NET User Group, I was told that I could run my NUnit tests directly in the Visual Studio 2012 without any special plugins.  Naturally, I was very excited and I immediately tried running my NUnit tests. I was somewhat disappointed to see that the Test Runner did not discover any of my NUnit tests.  Apparently, you do still need to install an extension that supports NUnit.  Microsoft has completely re-written the Test Runner in Visual Studio 2012 and opened it up for anyone to write Test Adapters for any unit test framework (not just MSTest).  Once the correct test adapters are installed, everything works great.  Luckily, there are a good number of adapters already written. Here are some Test Adapters that you might find useful: NUnit Test Adapter – This one is still in beta, but tit does work with the official Visual Studio 2012 release xUnit.net Test Adapter Silverlight Unit Test Adapter Chutzpah Test Adapter Overall, I still prefer the unit test runner in ReSharper, but this is a great new feature for those who might not have a ReSharper license.

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• Backup script that excludes large files using Duplicity and Amazon S3

  - by Jason

  I'm trying to write an backup script that will exclude files over a certain size. My script gives the proper command, but when run within the script it outputs an an error. However if the same command is run manually everything works...??? Here is the script based on one easy found with google #!/bin/bash # Export some ENV variables so you don't have to type anything export AWS_ACCESS_KEY_ID="accesskey" export AWS_SECRET_ACCESS_KEY="secretaccesskey" export PASSPHRASE="password" SOURCE=/home/ DEST=s3+http://s3bucket GPG_KEY="7743E14E" # exclude files over 100MB exclude () { find /home/jason -size +100M \ | while read FILE; do echo -n " --exclude " echo -n \'**${FILE##/*/}\' | sed 's/\ /\\ /g' #Replace whitespace with "\ " done } echo "Using Command" echo "duplicity --encrypt-key=$GPG_KEY --sign-key=$GPG_KEY `exclude` $SOURCE $DEST" duplicity --encrypt-key=$GPG_KEY --sign-key=$GPG_KEY `exclude` $SOURCE $DEST # Reset the ENV variables. export AWS_ACCESS_KEY_ID= export AWS_SECRET_ACCESS_KEY= export PASSPHRASE= If run I recieve the error; Command line error: Expected 2 args, got 6 Enter 'duplicity --help' for help screen. Any help your could offer would be greatly appreciated.

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• Efficient coding in Visual Studio (or another IDE), with touch typing

  - by cheeesus

  Moving the cursor to another position in code is one of the most frequent actions when coding. I don't write my programs from the beginning to the end, like a letter. However, moving the cursor requires me to move my right hand to the key arrows or to the mouse, which feels like an interruption to my writing rhythm, since I'm using touch typing. I want my hands to rest on the keyboard. It's difficult to explain what I mean, but I think every coder using touch typing knows what I mean. I tried many things, like defining some shortcuts as surrogate arrow keys (Shift+Alt+J, K, L, I), or buying a keyboard with a Trackpoint, Trackpad, or Trackball on it, but I have not yet found a satisfying solution to the problem. What is the best solution you know of, regardless of which IDE you use? Edit: Thank you for your answers. I am using a lot of shortkeys, but I think using a Vim plugin in Visual Studio would interfere too much with the shortkeys I am used to. Also, I have a keyboard with a built-in mouse, but I'm still looking for a better solution.

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• Paranoid Encryption

  - by Lord Jaguar

  Call me paranoid, but I really like to keep my stuff secret, but readily available on the cloud. So, asking this question. How safe and reliable is encryption software (e.g., truecrypt)? The reason I ask is that, what is I encrypt my data today with this software and after a couple of years, the software is gone ! What happens to my encrypted data? Is it equally safe to AES encrypt using 7-zip? Will it provide the same level or equivalent level of encryption as truecrypt or other encryption software? (I agree truecrypt will be better because of the container encryption it gives.) And what happens if 7-zip shuts down after 5 years? I am sorry if I am sounding paranoid, but I am coming back to my original question... Is there any application/software independent encryption? Meaning, can I encrypt with one software and decrypt with another so that I will not be dependent on just one vendor? I want my encryption to depend ONLY on the password and NOT on the encryption program/software? The next question, can I write my own program that does AES/stronger encryption when I give it a passphrase, so that I don't need to depend on third party software for encryption? If yes, which language supports the same? Can someone give me a heads up as to where to look for in case of writing my own encryption program?

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• What to do when you're the interviewer and you don't like your job?

  - by emcb

  I'm in a sorta strange predicament, and I could use some advice. When I was interviewing for my current job, the job description I was given seemed pretty darn nice to me. Without going into the details, the job hasn't quite turned out the way it was advertised. The company is great and takes care of its employees, but for someone who cares about the code they write and the work they do, it's a bad environment - effectively, we operate between 0.5 and 1.0 on the Joel test, and due to political issues we're not going to move beyond that any time soon. Bitter? Maybe. OK...so I'm in the market for a new job. But that's not where my dilemma is. The problem that I see coming is that I will be participating in interviewing some candidates for a position on my team, and I'm not sure what to do. I've heard through the grapevine that we have some really solid, promising, fresh-out-of-college prospects coming in to interview, and I honestly dread the thought of somebody having their first experience of engineering in this department. So I'm wondering: what should I do if/when the interviewee asks me "Do you like your job?" (no) "What kind of projects would I be working on?" (mostly static HTML/CSS changes) Anything else that would elicit a negative answer if told truthfully Do I tell the truth, to give the candidate a real picture of the job? What if this scares them away, and what if it gets blamed on me? Do I fib or lie, saying we work on exciting projects with lots of flexibility, like the pitch my boss will give when the reality is quite different? Should I feel any kind of moral responsibility to let a promising young developer know that this isn't the job for them, or should I shut up and be loyal 100% to the company? Any approaches or advice is appreciated. I hope I don't come across as overly dramatic - I honestly struggle with this question.

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• Which language is more suitable heavy file tasks?

  - by All

  I need to write a script (based on basic functions) to process /image/audio/video files. The process is mainly filesystem tasks and converts. The database of files has been stored by mysql. The script is simple but cause heavy tasks on the system; for example renaming/converting/copying thousands of file in a run. The script does not read the content of files into memory, it just manage the commands for sub-processes. The main weight is on the communication with filesystem. The script will be used regularly for new files. My concern is about performance. I am thinking of Shell script a complied language like C Please advise which programming language is more suitable for this purpose and why? UPDATE: An example is to scan a folder for images, convert them with ImageMagick, move files to destination folder, get file info, then update the database. As you can see, the process has no room for optimization, and most of languages have similar APIs for popular programs like ImageMagick, MySQL, etc. Thus, it can be written in any language. I just wish to reduce resource usage by speeding up the long loop. NOTE: I know that questions about comparing languages are not favorable, but I really had problem to choose, because the problems can appear in action.

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• Windows Despooler Requires Administrator to Print

  - by Software Monkey

  Does anyone know what changes I might need to make to allow restricted users to print using a printer configured for spooling? My Windows XP SP3 system currently requires me to use an Admin account for printing if the print is configured to spool documents before printing. If the printer is configured for direct printing it works for all accounts. This used to work and some months back it just stopped, and I can't pin down why. The printer itself is configured for all uses to have complete authority. My system is locked down for restricted users given them only read authority to the entire file system except their data directories, which is how I have run my systems for years. I assume there may be a directory somewhere that I need to allow users to write to.

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• Recommended Setup

  - by Chris Ryan

  I have been running into issue with my MSSQL Database setup with speed. Here is my scenario. About 100M Rows Average: 1k Updates Per Second Hard Drives: RAID 10 SSD MDF --Active Time: 0 Log Drives: 1 SSD LDF - Simple Recovery --Active Time 99.9 --Queue: 8 I do not need a back up of the log so it is set to simple recovery but my bottleneck is still at my log. I get high WAITLOG times and thus it can not update any faster. I can't do bulk updates/transactions and each update needs to be one at a time. Is my only option to increase write performance of the log drives, add a RAID drives? Any suggestions on increasing the performance?

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• learn the programming language for computing functions about integers

  - by asd

  Hi I know something about Pascal, Mathematica and Matlab, but I dont have any idea about C,C++,C# languages. I want to learn one of the languages that they they are fast and exact to compute some arithmetic functions for large numbers(for example larger than $10^3000$). I asked somebody and he said he used C++ and he said I computed this sequence in less than 10 min. I want to know C, C++, C# and visual kind of theses programs and know which is better for my goal. Let $f$ be an arithmetic function and A={k1,k2,...,kn} are integers in increasing order. Now I want to start with k1 and compare f(ki) with f(k1). If f(ki)f(k1), put ki as k1. Now start with ki, and compare f(kj) with f(ki), for ji. If f(kj)f(ki), put kj as ki, and repeat this procedure. At the end we will have a sub sequence B={L1,...,Lm} of A by this property: f(L(i+1))f(L(i)), for any 1<=i<=m-1 I have written a code for this program with Mathematica, and it take some hours to compute f of ki's or the set B for large numbers. For example, let f is the divisor function of integers. Do you know how to write the code for my purpose in Mathematica or Matlab. Mathematica is preferable.

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• Logging library for (c++) games

  - by Klaim

  I know a lot of logging libraries but didn't test a lot of them. (GoogleLog, Pantheios, the coming boost::log library...) In games, especially in remote multiplayer and multithreaded games, logging is vital to debugging, even if you remove all logs in the end. Let's say I'm making a PC game (not console) that needs logs (multiplayer and multithreaded and/or multiprocess) and I have good reasons for looking for a library for logging (like, I don't have time or I'm not confident in my ability to write one correctly for my case). Assuming that I need : performance ease of use (allow streaming or formating or something like that) reliable (don't leak or crash!) cross-platform (at least Windows, MacOSX, Linux/Ubuntu) Wich logging library would you recommand? Currently, I think that boost::log is the most flexible one (you can even log to remotely!), but have not good performance. Pantheios is often cited but I don't have comparison points on performance and usage. I've used my own lib for a long time but I know it don't manage multithreading so it's a big problem, even if it's fast enough. Google Log seems interesting, I just need to test it but if you already have compared those libs and more, your advice might be of good use. Games are often performance demanding while complex to debug so it would be good to know logging libraries that, in our specific case, have clear advantages.

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