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  • Ridiculously Simple Erlang Question

    - by Aiden Bell
    Read (skimmed enough to get coding) through Erlang Programming and Programming Erlang. One question, which is as simple as it sounds: If you have a process Pid1 on machine m1 and a billion million messages are sent to Pid1, are messages handled in parallel by that process (I get the impression no) and is there any guarantee of order when processing messages? ie. Received in order sent? Coming from the whole C/Thread pools/Shared State background ... I want to get this concrete. I understand distributing an application, but want to ensure the 'raw bones' are what I expect before building processes and distributing workload. Also, am I right in thinking the whole world is currently flicking through Erlang texts ;)

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  • MySQL Error for Mac OSx

    - by OckhamsRazor
    I'm trying to run the mysql command on my mac osx but keep getting the error: ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2) I did try researching this extensively but could'nt find a suitable solution. Most of the solutions refer to /etc/my.cnf but I don't seem to have this configuration file in the first place. I'm pretty much stuck and have been for quite a while. Any help is greatly appreciated.

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  • Advanced example-driven C book with a lot of code.

    - by Inso Reiges
    Hello, I am looking for a book on advanced C programming that: Teaches how to effectively express one's solution in C when one already knows the language in depth. Shows some common design idioms expressed in C, like encapsulation, modularity and that kind of thing. Is example-driven with a lot of good-quality code. I already know the language itself so books like otherwise wonderful "Expert C Programming" by Peter van der Linden is not really what i am looking for. What i need is a book on how to express my design in C, what are the common idioms, best practices, etc. I would also like to note that i am primarily interested in C, not C++, C#, Objective-C or any other languages inspired by C-like syntax. Thank you.

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  • Delphi - online technical tests

    - by RBA
    I have searched for some online Delphi programming tests, and except the small test for Delphi certification and several tests on Delphi.about.com I did find nothing. Any ideas where I can find some Delphi online tests? LE: defining online Delphi programming tests: - technical questions about Delphi fundamentals,Data types,classes, libraries, generics, database concepts, etc. Examples here (Delphi Developer Certification Exam Study Guide) and here. LE2: tests to take after you have read all the articles from this question: Questions every good Delphi developer should be able to answer?

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  • Time order of messages

    - by Aiden Bell
    Read (skimmed enough to get coding) through Erlang Programming and Programming Erlang. One question, which is as simple as it sounds: If you have a process Pid1 on machine m1 and a billion million messages are sent to Pid1, are messages handled in parallel by that process (I get the impression no) and(answered below) is there any guarantee of order when processing messages? ie. Received in order sent? If so, how is clock skew handled in high traffic situations for ordering? Coming from the whole C/Thread pools/Shared State background ... I want to get this concrete. I understand distributing an application, but want to ensure the 'raw bones' are what I expect before building processes and distributing workload. Also, am I right in thinking the whole world is currently flicking through Erlang texts ;)

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  • Sun Fire V20z also with AMD Opteron 256?

    - by Dan
    Hi, I have a SUN Fire V20z with two Opteron 244, which I'd like to upgrade. The official datasheet says that it supports up to Opteron 252. I was wondering if it would also work with AMD Opteron 256, cause they have the same core voltage and socket? Thanks for helping.

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  • Which set(s) of video lectures for computer science?

    - by SebKom
    As most of you know a couple of top universities (MIT, Stanford, etc) around the world are now publishing videos of their lectures online. I am advancing to the third and final year of my computer science degree this September and I was thinking about spending some time during the summer to watch a couple of lectures, in order to improve my understanding of algorithms, complexity, programming, software engineering, etc. Now I don't have infinite time to spend so I can't watch all of the lectures from all of the universities so I was wondering if you could suggest me which sets to watch from each one (something like "Algorithms from MIT", "Programming from Yale", etc).

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  • Multicast Prblem in Linux Red Hat server

    - by Uma Kant Verma
    I am facing a very strange behavior on my server. I am using a linux cluster.On fail over server my broadcast application halts after 5 minutes.But it is working fine on Primary server. My application process listening on port and send broadcast.It is working 5 mins after that it wait on socket for further packets but it didn't receive anything. Same process is working fine at Primary server. Plz help me.

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  • wxWidgets - Add items to sizer via DLL

    - by intl
    I have a GUI set up with wxWidgets (C++, MSVC) and part of the functionality is to add elements to the GUI via DLL's. Essentially, I would be passing in a sizer to the DLL which will in turn add the elements based on what is in the DLL. Could someone just point me in the right direction on how to get the DLL set up? I have looked, but don't see anything that's similar to what I'm looking for. The programming of the elements is fine with me, I just need to understand how to structure the DLL programming. Help appreciated.

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  • Cron Job that Boots Screen at Start

    - by Pez Cuckow
    I am trying to set up a number of processes that start during boot (servers for games) with the below command as the cron item: @reboot /usr/bin/screen -fa -d -m -S NAME COMMAND However if the server crashes for what ever reason screen closes and the server doesn't get a chance to run it's auto restart (as far as I understand; screen sees no processes in the socket and so closes). Is there a way that I can get around this so screen will sit there even if nothing is running in it?

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  • postfix error fatal:table lookup

    - by samer na
    here the mail.log server localhost: Can't connect to local MySQL server through socket '/var/run/mysqld /mysqld.sock' (2) Mar 23 23:07:19 ubuntu postfix/trivial-rewrite[6417]: fatal: mysql:/etc/postfix/mysql_virtual_alias_maps.cf(0,lock|fold_fix): table lookup problem Mar 23 23:07:20 ubuntu postfix/smtpd[6401]: warning: problem talking to service rewrite: Success Mar 23 23:07:20 ubuntu postfix/cleanup[6296]: warning: problem talking to service rewrite: Connection reset by peer Mar 23 23:07:20 ubuntu postfix/master[6291]: warning: process /usr/lib/postfix/trivial-rewrite pid 6417 exit status 1 Mar 23 23:07:20 ubuntu postfix/master[6291]: warning: /usr/lib/postfix/trivial-rewrite: bad command startup -- throttling

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  • How to create real-life robots?

    - by Click Upvote
    Even before I learnt programming I've been fascinated with how robots could work. Now I know how the underlying programming instructions would be written, but what I don't understand is how those intructions are followed by the robot. For example, if I wrote this code: object=Robot.ScanSurroundings(300,400); if (Objects.isEatable(object)) { Robot.moveLeftArm(300,400); Robot.pickObject(object); } How would this program be followed by the CPU in a way that would make the robot do the physical action of looking to the left, moving his arm, and such? Is it done primarily in binary language/ASM? Lastly, where would i go if I wanted to learn how to create a robot?

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  • Possibility of language data type not mapped to shipped .NET Framework?

    - by John K
    Does anybody know of a managed programming language implemented on .NET that contains a specialized data type that is not mapped through to the Common Type System/FCL/BCL or one that does not have a shipped .NET equivalent (e.g. shipped standard types like System.String, System.Int32)? This question would likely come from the perspective of someone porting a compiler (although I'm not doing that). Is it as simple as the language creating a new data type outside the BCL/FCL for its specialized type? If so does this hinder interoperability between programming languages that are otherwise accustomed to mapping all their built-in data types to what's in the BCL/FCL, like Visual Basic and C#? I can imagine this situation might come about if an obscure language compiler of some kind is ported to .NET for which there is no direct mapping of one of its implicit data types to the shipped Framework. How is this situation supported or allowed in general? What would be the expectation of the compiler and the Common Language Runtime?

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  • RSS-Feed or XML-Stream?

    - by Maenny
    HI Folks, I am programming a website for online-reservation-management, preferably for holiday homes. I want to implement a service, which allows the user to pass all their occupation dates to other websites. My question is, what would be the most professional way to do this? Generate a XML-stream Create a valid RSS Feed I think that a XML file has the advantages of being straight to the point, without any information that noone needs. Webmasters of other websites surely prefer the structure of a simple XML file. On the other hand, when someone without programming knowledge wants to use the RSS-Feed with a feedreader or simply with the browser, it may be user-friendlier to use a RSS-FEED. What so you think, I'm unsure...? Greetz Maenny

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  • LaTeX: Left aligning without extra space between words in tables

    - by goldfrapp04
    Here is the illustrating code: \documentclass[letterpaper, 10pt]{article} \usepackage[margin=1in]{geometry} \usepackage{array} \usepackage[none]{hyphenat} \begin{document} \begin{center} \begin{tabular}{|m{4.5cm}|m{1.2cm}<{\centering}|m{8cm}|c|} \hline \centering \textbf{Course Name} & \centering \textbf{Date} & \centering \textbf{Textbook} & \centering \textbf{Grade} \tabularnewline \hline C Programming Language \& Lab & 09/2009 - 12/2009 & Brian W. Kernighan, and Dennis M. Ritchie, \textit{The C Programming Language}, 2nd ed. ISBN:9780131103627 & 89 \\ \hline Integrative Practice on Courses & 07/2011 & LUPA, \textit{Linux Software Engineer}, ISBN:9787030199645 & 87 \\ \hline \end{tabular} \end{center} \end{document} As shown in the pdf generated, there are too much space between some words because I disabled automatic hyphenation. I'd like to leave only single space between words, without justify align. THANK YOU!

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  • Change a Recursive function that has a for loop in it into an iterative function?

    - by Bill
    So I have this function that I'm trying to convert from a recursive algorithm to an iterative algorithm. I'm not even sure if I have the right subproblems but this seems to determined what I need in the correct way, but recursion can't be used you need to use dynamic programming so I need to change it to iterative bottom up or top down dynamic programming. The basic recursive function looks like this: Recursion(i,j) { if(i>j) return 0; else { //This finds the maximum value for all possible subproblems and returns that for this problem for(int x = i; x < j; x++) { if(some subsection i to x plus recursion(x+1,j) is > current max) max = some subsection i to x plus recursion(x+1,j) } } } This is the general idea, but since recursions typically don't have for loops in them I'm not sure exactly how I would convert this to iterative. Does anyone have any ideas?

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  • Strange Java Coding??? Class in class???

    - by poeschlorn
    Hi guys, I got a question about Java coding in general... In some sample codes there are methods and classes declared WITHIN other methods and/or classes.... I've never heard/red about this...what effect does this kind of programming have? Wouldn't it be better to write down classes in a seperate file and methods side by side and not within each other (like every book tells you)? What are the advantages and disadvantages of this kind of programming? Here's an example of what I mean: Handler mHandler = new Handler() { public void handleMessage(android.os.Message msg) { TextView textView = (TextView) findViewById(R.id.description); textView.setText(mRoad.mName + " " + mRoad.mDescription); MapOverlay mapOverlay = new MapOverlay(mRoad, mapView); List<Overlay> listOfOverlays = mapView.getOverlays(); listOfOverlays.clear(); listOfOverlays.add(mapOverlay); mapView.invalidate(); }; };

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  • Whats the deal with python?

    - by gmatt
    My interests in programming lie mainly in algorithms, and lately I have seen many reputable researchers write a lot of their code in python. How easy and convenient is python for scientific computing? Does it have a library of algorithms that compares to matlab's? Is Python a scripting language or does it compile? Is it a great language for prototyping an algorithm? How long would it take me to learn enough of it to be productive provided I know C well and OO programming somewhat? Is it OO based? Sorry for the condensed format of questions, but I'm very curious and was hoping a more experienced programmer could help me out.

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  • passing parameter to view in IOS after a button is pressed

    - by ghostrider
    I am new to IOS programming. So far I have been programming in android. So in android when pressing a button code for passing an argument would be like that: Intent i = new Intent(MainScreen.this,OtherScreen.class); Bundle b = new Bundle(); b.putString("data_1",data); i.putExtras(b); startActivity(i); and on the activity that opens, i would write something like this: Bundle b = getIntent().getExtras(); ski_center=b.getString("data_1"); what methods should I need to change in MainScreen and in OtherScreen in IOS to achieve the above. Basically I will have 3 buttons lets say in my MainScreen and each of it will open the Otherview but each time a different parameter will be passed. Foe example for each button i have code like these in MainScreen.m @synthesize fl; -(IBAction) ifl:(id) sender { } So I need your help in where to place the "missing" code, too.

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  • Format SQL Query Result into web menu

    - by highwingers
    I am trying to bhuild a drill down menu for my website, where user will click on a category and it will show the subcategories of that clicked category, there could be n-levels. I am able to write sql query which returns the output exactaly as I want, but the problem is...I dont want to show the whole menu to end user, I would like to open/expand only clicked category. my Query output is: 1 IPTV 2 Jadoo Tv 3 Shava Tv 4 Jalva Tv 5 Programming 6 Microsoft 7 Asp.Net 8 PHP so by default IPTV & Programming Should be displayed, since they are parent, and when I click on IPTV it should open the children of IPTV, like I said there could be n-levels. I was thinking, I can load the output of query to webpage and then control the menu navigation with css/javascript. do you guys have any ideas?

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  • wget-ing protected content with exported cookies

    - by XXL
    I have exported a pair of cookies from Firefox that are valid for the URL in question and tried accessing/downloading the protected content off that address, but the end result is a return to the login page. I have tried doing the same thing for 3 other websites with similar outcome. Any clues as to what I might be doing wrong? The syntax I'm using: wget --load--cookies=FILE URL ----------------------------------------------- DEBUG output created by Wget 1.12 on linux-gnu. Stored cookie www.x.org -1 (ANY) / <permanent> <insecure> [expiry 1901-12-13 22:25:44] c_secure_login lz8xZQ%3D%3D Stored cookie www.x.org -1 (ANY) / <permanent> <insecure> [expiry 1901-12-13 22:25:44] c_secure_pass 2fd4e1c67a2d28fced849ee1bb76e74a Stored cookie www.x.org -1 (ANY) / <permanent> <insecure> [expiry 1901-12-13 22:25:44] c_secure_uid GZX4TDA%3D --2011-01-14 13:57:02-- www.x.org/download.php?id=397003 Resolving www.x.org... 1.1.1.1 Caching www.x.org => 1.1.1.1 Connecting to www.x.org|1.1.1.1|:80... connected. Created socket 5. Releasing 0x0943ef20 (new refcount 1). ---request begin--- GET /download.php?id=397003 HTTP/1.0 User-Agent: Wget/1.12 (linux-gnu) Accept: */* Host: www.x.org Connection: Keep-Alive ---request end--- HTTP request sent, awaiting response... ---response begin--- HTTP/1.1 302 Found Date: Fri, 14 Jan 2011 11:26:19 GMT Server: Apache X-Powered-By: PHP/5.2.6-1+lenny8 Set-Cookie: PHPSESSID=5f2fd97103f8988554394f23c5897765; path=/ Expires: Thu, 19 Nov 1981 08:52:00 GMT Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0 Pragma: no-cache Location: www.x.org/login.php?returnto=download.php%3Fid%3D397003 Vary: Accept-Encoding Content-Length: 0 Keep-Alive: timeout=15, max=100 Connection: Keep-Alive Content-Type: text/html ---response end--- 302 Found Stored cookie www.x.org -1 (ANY) / <session> <insecure> [expiry none] PHPSESSID 5f2fd97103f8988554394f23c5897765 Registered socket 5 for persistent reuse. Location: www.x.org/login.php?returnto=download.php%3Fid%3D397003 [following] Skipping 0 bytes of body: [] done. --2011-01-14 13:57:02-- www.x.org/login.php?returnto=download.php%3Fid%3D397003 Reusing existing connection to www.x.org:80. Reusing fd 5. ---request begin--- GET /login.php?returnto=download.php%3Fid%3D397003 HTTP/1.0 User-Agent: Wget/1.12 (linux-gnu) Accept: */* Host: www.x.org Connection: Keep-Alive Cookie: PHPSESSID=5f2fd97103f8988554394f23c5897765 ---request end--- HTTP request sent, awaiting response... ---response begin--- HTTP/1.1 200 OK Date: Fri, 14 Jan 2011 11:26:20 GMT Server: Apache X-Powered-By: PHP/5.2.6-1+lenny8 Expires: Thu, 19 Nov 1981 08:52:00 GMT Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0 Pragma: no-cache Vary: Accept-Encoding Content-Length: 2171 Keep-Alive: timeout=15, max=99 Connection: Keep-Alive Content-Type: text/html ---response end--- 200 OK Length: 2171 (2.1K) [text/html] Saving to: `x.out' 0K .. 100% 18.7M=0s 2011-01-14 13:57:02 (18.7 MB/s) - `x.out' saved [2171/2171]

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  • What is Perl's secret of getting small code do so much?

    - by sak
    I've seen many (code-golf) Perl programs out there and even if I can't read them (Don't know Perl) I wonder how you can manage to get such a small bit of code to do what would take 20 lines in some other programming language. What is the secret of Perl? Is there a special syntax that allows you to do complex tasks in few keystrokes? Is it the mix of regular expressions? I'd like to learn how to write powerful and yet short programs like the ones you know from the code-golf challenges here. What would be the best place to start out? I don't want to learn "clean" Perl - I want to write scripts even I don't understand anymore after a week. If there are other programming languages out there with which I can write even shorter code, please tell me.

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