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• from MS Biology to BS Computer Science [on hold]

  - by Air Borne

  I'm Marco from Italy and I'd like to ask you a piece of advice about my career. I hold a Ms degree in Biology, I enjoyed a lot studying it and I got very good grades but I didn't know what to do with my degree in the real life. Few months ago, I began to read a book about Python programming (Introduction to Computer Science, Zelle J.) and I've great fun learning Python as a beginner, I wake up in the morning thinking about doing excersies and writing simple programs with python :) I'm also watching free lectures from MIT open courseware, and I'm feeling a certain degree of regrets for never asking myself what was computer science, since it seems to me it's a magic world. After weeks of doubts, I made a move :) I applied for a CS bachelor degree abroad, I got an interview and I'm going to start this great adventure next September. I feel incredibly excited at it, but a little bit scared too. Scared because sometimes I think I'm making a great mistake for my life restarting from a bachelor in a completely different area of study. Sometimes I hear people saying the IT market is bad, sometimes I hear other ones saying quite the opposite instead. Moreover, some colleagues of mine suggested me to try to get into Bioinformatics, instead of CS. My question is: I want to really discover if CS is for me, I mean the passion of my life. I know I'm just a beginner and I can't say nothing about it yet. What do you suggest me: CS or Bioinformatics? If I get a Bs in CS, could I get into bioinformatics without relevant experience, taking into account I have a Ms Biology degree? Any comment is appreciated, thanks in advance.

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• Why do memory-managed languages retain the `new` keyword?

  - by Channel72

  The new keyword in languages like Java, Javascript, and C# creates a new instance of a class. This syntax seems to have been inherited from C++, where new is used specifically to allocate a new instance of a class on the heap, and return a pointer to the new instance. In C++, this is not the only way to construct an object. You can also construct an object on the stack, without using new - and in fact, this way of constructing objects is much more common in C++. So, coming from a C++ background, the new keyword in languages like Java, Javascript, and C# seemed natural and obvious to me. Then I started to learn Python, which doesn't have the new keyword. In Python, an instance is constructed simply by calling the constructor, like: f = Foo() At first, this seemed a bit off to me, until it occurred to me that there's no reason for Python to have new, because everything is an object so there's no need to disambiguate between various constructor syntaxes. But then I thought - what's really the point of new in Java? Why should we say Object o = new Object();? Why not just Object o = Object();? In C++ there's definitely a need for new, since we need to distinguish between allocating on the heap and allocating on the stack, but in Java all objects are constructed on the heap, so why even have the new keyword? The same question could be asked for Javascript. In C#, which I'm much less familiar with, I think new may have some purpose in terms of distinguishing between object types and value types, but I'm not sure. Regardless, it seems to me that many languages which came after C++ simply "inherited" the new keyword - without really needing it. It's almost like a vestigial keyword. We don't seem to need it for any reason, and yet it's there. Question: Am I correct about this? Or is there some compelling reason that new needs to be in C++-inspired memory-managed languages like Java, Javascript and C#?

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• "sha256sum mismatch jdk-7u3-linux-x64.tar.gz " error when trying to install Oracle Java

  - by Fawkes5

  i recently tried installed java 7 on ubuntu 12.04 and i think i screwed something up I followed the instructions given here. First you need to remove openjdk for this run the following command from your terminal sudo apt-get purge openjdk* Now you can install Java7 by adding the following repository: sudo add-apt-repository ppa:eugenesan/java sudo apt-get update sudo apt-get install oracle-java7-installer Now everytime i install a new program i get the following error: Download done. sha256sum mismatch jdk-7u3-linux-x64.tar.gz Oracle JDK 7 is NOT installed. dpkg: error processing oracle-java7-installer (--configure): subprocess installed post-installation script returned error exit status 1 Setting up python-central (0.6.17ubuntu1) ... Setting up python-eggtrayicon (2.25.3-11) ... Setting up gmail-notify (1.6.1.1-1ubuntu1) ... Processing triggers for python-central ... Errors were encountered while processing: oracle-java7-installer Error in function: However.The program seems to install and work just fine so it doesn't seem to be a problem preventing me from doing anything So then i reinstalled openjdk by going: sudo apt-get install openjdk* But i still get the same error. going: sudo apt-get install oracle-java7-installer gives me the same error. What is going on? Please let me know if this is clear or not and ill try to explain my issue better

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• What language and topics should be covered when teaching non-CS college students how to program?

  - by michaelcarrano

  I have been asked by many of my non-computer science friends to teach them how to program. I have agreed to hold a seminar for them that will last for approximately 1 to 2 hours. My thoughts are to use Python as the language to teach them basic programming skills. I figured Python is relatively easier to learn from what I have researched. It is also a language I want to learn which will make holding this seminar all the more enjoyable. The topics I plan to cover are as followed: Variables / Arrays Logic - If else statements, switch case, nested statements Loops - for, while, do-while and nested loops Functions - pass by value, pass by reference (is this the correct terms for Python? I am mostly a C/C++ person) Object Oriented Programming Of course, I plan to have code examples for all topics and I will try to have each example flow into each other so that at the end of the seminar everyone will have a complete working program. I suppose my question is, if you were given 1 to 2 hours to teach a group of college students how to program, what language would you choose and what topics would you cover? Update: Thank you for the great feedback. I should have mentioned in my earlier post above that a majority of the students attending the seminar have some form of programming experience whether it was with Java or using Matlab. Most of these students are 3rd/4th year Engineering students who want to get a refresher on programming before they graduate.

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• Hobbyist transitioning to earn money on paid work?

  - by Chelonian

  I got into hobbyist Python programming some years ago on a whim, having never programmed before other than BASIC way back when, and little by little have cobbled together a, in my opinion, nice little desktop application that I might try to get out there in some fashion someday. It's roughly 15,000 logical lines of code, and includes use of Python, wxPython, SQLite, and a number of other libraries, works on Win and Linux (maybe Mac, untested) and I've gotten some good feedback about the application's virtues from non-programmer friends. I've also done a small application for data collection for animal behavior experiments, and an ad hoc tool to help generate a web page...and I've authored some tutorials. I consider my Python skills to be appreciably limited, my SQL skills to be very limited, but I'm not totally out to sea, either (e.g. I did FizzBuzz in a few minutes, did a "Monty Hall Dilemma" simulator in some minutes, etc.). I also put a strong premium on quality user experience; that is, the look and feel matters much to me and the software looks quite good, I feel. I know no other programming languages yet. I also know the basics of HTML/CSS (not considering them programming languages) and have created an artist's web page (that was described by a friend as "incredibly slick"...it's really not, though), and have a scientific background. I'm curious: Aside from directly selling my software, what's roughly possible--if anything--in terms of earning either side money on gigs, or actually getting hired at some level in the software industry, for someone with this general skill set?

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• Problem with understanding how to start

  - by Coolface

  Okay, this might be a little off-topic but i try anyway. Sorry to bother. So i'm working as sysadmin for at least 5 years now and i quite enjoy IT field in general. Somehow i was never interested in programming much but always want to learn something at least easy and for personal usage. As sysadmin i need scripting skills so learn shell scripting without much problems, i also try to learn pascal, delphi, basic over time and must recent was python. Well, my problem is when i try to learn programming i just can't apply what i learn from the books to the real word. What i mean is i understand there are data structures, algorithms, variables, lib's, if-then logic, etc. but i just can't understand how to apply this things when i want to do real things. Like i want to get a something simple as parse web page, i draw a quick algorithm like get a web page, find a word on it and write a to file, on the paper everything look simple but when i get to the coding i just stuck pretty much from the start. I try read code of the real programs that just totally confusing especially big parts with many classes so i'm just quickly lost a trail what this code do. I think i just lack some fundamentals to see a big picture but don't really know what this might be? Or maybe i just don't have a passion to programming at all... My best bet was a shell scripting so i have really no problems to write complex scripts but this just not enough. Recently i was read around 5 or 6 python books because everyone say it's so easy even kid can code something but still no much luck, python is good and easy but i can't make something harder then a prodecurial style code like in bash for easy things but when i want harder things i'm still stuck. In college i was also not a math and tech guy and like to study non-tech stuff mostly like economy, psychology maybe that my problem? Anyway any advice would be greatly appriciated.

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• Mercurial extensions not working in Windows 7 x64?

  - by Samuel Meacham

  We are test driving Mercurial at work. We don't want to have to enter our user/pass each time we interact with a repository, so we set up the mercurial_keyring extension. We: Installed Python 2.6.5 (32 or 64 bit, depending on the system) Installed setuptools (for easy_install.exe) easy_install keyring easy_install mercurial_keyring And then made the appropriate changes to %userprofile%/mercurial.ini in the [auth] section. It works fine on my colleague's computer (32bit xp sp3), but it does not work on my machine (Windows 7 Ultimate x64). Also noteworthy, the setuptools had to be built from source on Win 7 x64 (python setup.py bdist_wininst, then run the resulting setuptools-0.6c11.win-amd64.exe). Using just hg.exe from the Mercurial 1.5 binary installation (the .msi), I get this error when I run hg.exe: * failed to import extension mercurial_keyring: No module named mercurial_keyring I tried to change my mercurial.ini, to specify the path to the mercurial_keyring.py file, instead of having mercurial find it (since it's in the PYTHONPATH). Old: [extensions] mercurial_keyring = New: [extensions] mercurial_keyring = c:/mercurial/extensions/mercurial_keyring.py The error changes to: abort: could not import module keyring! So while providing the path to the mercurial_keyring extension works, the dependent keyring module still cannot be found. After further investigation, it appears that NO extensions work. They all produce the error: * failed to import extension [extension name]: No module named [module name] It appears that when running hg.exe, it is not aware of PYTHONPATH. I have tried: Python 2.6.5 32 bit Python 2.6.5 64 bit Building Mercurial 1.5 from source with MinGW Building Mercurial 1.5 from source with MSVC9 Using hg.exe from the 1.5 binary dist (.msi) Using the hg.py in c:\python26\scripts when building from source Various configurations in %userprofile%/mercurial.ini Using setuptools (easy_install.exe) to install keyring and mercurial_keyring Building keyring and mercurial_keyring from source (python setup.py bdist_wininst) Nothing works. The closest I've got is using hg.py when building from source. It at least doesn't give me errors, and actually creates %userprofile%/wincrypto_pass.cfg when I enter my credentials. But on subsequent requests, it doesn't enter the credentials automatically. It prompts me for them again. Interestingly, TortoiseHG is using the keyring. I just can't get it to work on the command line. I think something is going on with Win 7 x64 that is preventing mercurial (hg.exe) from seeing the PYTHONPATH, so it can't find any of the installed modules. Does anyone have extensions working in Win 7 x64? Specifically with the binary installation of mercurial (not hg.py)?

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• Does weak typing offer any advantages?

  - by sub

  Don't confuse this with static vs. dynamic typing! You all know JavaScripts/PHPs infamous type systems: PHP example: echo "123abc"+2; // 125 - the reason for this is explained // in the PHP docs but still: This hurts echo "4"+1; // 5 - Oh please echo "ABC"*5; // 0 - WTF // That's too much, seriously now. // This here might be actually a use for weak typing, but no - // it has to output garbage. JavaScript example: // A good old JavaScript, maybe you'll do better? alert("4"+1); // 51 - Oh come on. alert("abc"*3); // NaN - What the... // Have your creators ever heard of the word "consistence"? Python example: # Python's type system is actually a mix # It spits errors on senseless things like the first example below AND # allows intelligent actions like the second example. >>> print("abc"+1) Traceback (most recent call last): File "<pyshell#2>", line 1, in <module> print("abc"+1) TypeError: Can't convert 'int' object to str implicitly >>> print("abc"*5) abcabcabcabcabc Ruby example: puts 4+"1" // Type error - as supposed puts "abc"*4 // abcabcabcabc - makes sense After these examples it should be clear that PHP/JavaScript probably have the most inconsistent type systems out there. This is a fact and really not subjective. Now when having a closer look at the type systems of Ruby and Python it seems like they are having a much more intelligent and consistent type system. I think these examples weren't really necessary as we all know that PHP/JavaScript have a weak and Python/Ruby have a strong type system. I just wanted to mention why I'm asking this. Now I have two questions: When looking at those examples, what are the advantages of PHPs and JavaScripts type systems? I can only find downsides: They are inconsistent and I think we know that this is not good Types conversions are hardly controllable Bugs are more likely to happen and much harder to spot Do you prefer one of the both systems? Why? Personally I have worked with PHP, JavaScript and Python so far and must say that Pythons type system has really only advantages over PHPs and JavaScripts. Does anybody here not think so? Why then?

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• trying to build Boost MPI, but the lib files are not created. What's going on?

  - by unknownthreat

  I am trying to run a program with Boost MPI, but the thing is I don't have the .lib. So I try to create one by following the instruction at http://www.boost.org/doc/libs/1_43_0/doc/html/mpi/getting_started.html#mpi.config The instruction says "For many users using LAM/MPI, MPICH, or OpenMPI, configuration is almost automatic", I got myself OpenMPI in C:\, but I didn't do anything more with it. Do we need to do anything with it? Beside that, another statement from the instruction: "If you don't already have a file user-config.jam in your home directory, copy tools/build/v2/user-config.jam there." Well, I simply do what it says. I got myself "user-config.jam" in C:\boost_1_43_0 along with "using mpi ;" into the file. Next, this is what I've done: bjam --with-mpi C:\boost_1_43_0>bjam --with-mpi WARNING: No python installation configured and autoconfiguration failed. See http://www.boost.org/libs/python/doc/building.html for configuration instructions or pass --without-python to suppress this message and silently skip all Boost.Python targets Building the Boost C++ Libraries. warning: skipping optional Message Passing Interface (MPI) library. note: to enable MPI support, add "using mpi ;" to user-config.jam. note: to suppress this message, pass "--without-mpi" to bjam. note: otherwise, you can safely ignore this message. warning: Unable to construct ./stage-unversioned warning: Unable to construct ./stage-unversioned Component configuration: - date_time : not building - filesystem : not building - graph : not building - graph_parallel : not building - iostreams : not building - math : not building - mpi : building - program_options : not building - python : not building - random : not building - regex : not building - serialization : not building - signals : not building - system : not building - test : not building - thread : not building - wave : not building ...found 1 target... The Boost C++ Libraries were successfully built! The following directory should be added to compiler include paths: C:\boost_1_43_0 The following directory should be added to linker library paths: C:\boost_1_43_0\stage\lib C:\boost_1_43_0> I see that there are many libs in C:\boost_1_43_0\stage\lib, but I see no trace of libboost_mpi-vc100-mt-1_43.lib or libboost_mpi-vc100-mt-gd-1_43.lib at all. These are the libraries required for linking in mpi applications. What could possibly gone wrong when libraries are not being built?

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• Question on multi-probe Local Sensitive Hashing

  - by Yijinsei

  Hey guys sorry to be asking this kind noob question, but because I really need some guidance on how to use Multi probe LSH pretty urgently, so I did not do much research myself. I realize there is a lib call LSHKIT available that implemented that algorithm, but I have trouble trying to figure out how to use it. Right now, I have a few thousand feature vector 296 dimension, each representing an image. The vector is used to query an user input image, to retrieve the most similar image. The method I used to derive the distance between vector is euclidean distance. I know this might be a rather noob question, but do you guys have knowledge on how should i implement multi probe LSH? I am really very grateful to any answer or response.

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• Viewing Content Of Blob In phpMyAdmin

  - by Joshua

  Sorry for the Noob Question, but what does the circled button mean, and how can I view the content of a blob?

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• how much time does grid.py take to run ?

  - by trinity

  Hello all , I am using libsvm for binary classification.. I wanted to try grid.py , as it is said to improve results.. I ran this script for five files in separate terminals , and the script has been running for more than 12 hours.. this is the state of my 5 terminals now : [root@localhost tools]# python grid.py sarts_nonarts_feat.txt>grid_arts.txt Warning: empty z range [61.3997:61.3997], adjusting to [60.7857:62.0137] line 2: warning: Cannot contour non grid data. Please use "set dgrid3d". Warning: empty z range [61.3997:61.3997], adjusting to [60.7857:62.0137] line 4: warning: Cannot contour non grid data. Please use "set dgrid3d". [root@localhost tools]# python grid.py sgames_nongames_feat.txt>grid_games.txt Warning: empty z range [64.5867:64.5867], adjusting to [63.9408:65.2326] line 2: warning: Cannot contour non grid data. Please use "set dgrid3d". Warning: empty z range [64.5867:64.5867], adjusting to [63.9408:65.2326] line 4: warning: Cannot contour non grid data. Please use "set dgrid3d". [root@localhost tools]# python grid.py sref_nonref_feat.txt>grid_ref.txt Warning: empty z range [62.4602:62.4602], adjusting to [61.8356:63.0848] line 2: warning: Cannot contour non grid data. Please use "set dgrid3d". Warning: empty z range [62.4602:62.4602], adjusting to [61.8356:63.0848] line 4: warning: Cannot contour non grid data. Please use "set dgrid3d". [root@localhost tools]# python grid.py sbiz_nonbiz_feat.txt>grid_biz.txt Warning: empty z range [67.9762:67.9762], adjusting to [67.2964:68.656] line 2: warning: Cannot contour non grid data. Please use "set dgrid3d". Warning: empty z range [67.9762:67.9762], adjusting to [67.2964:68.656] line 4: warning: Cannot contour non grid data. Please use "set dgrid3d". [root@localhost tools]# python grid.py snews_nonnews_feat.txt>grid_news.txt Wrong input format at line 494 Traceback (most recent call last): File "grid.py", line 223, in run if rate is None: raise "get no rate" TypeError: exceptions must be classes or instances, not str I had redirected the outputs to files , but those files for now contain nothing.. And , the following files were created : sbiz_nonbiz_feat.txt.out sbiz_nonbiz_feat.txt.png sarts_nonarts_feat.txt.out sarts_nonarts_feat.txt.png sgames_nongames_feat.txt.out sgames_nongames_feat.txt.png sref_nonref_feat.txt.out sref_nonref_feat.txt.png snews_nonnews_feat.txt.out (-- is empty ) There's just one line of information in .out files.. the ".png" files are some GNU PLOTS . But i dont understand what the above GNUplots / warnings convey .. Should i re-run them ? Can anyone please tell me on how much time this script might take if each input file contains about 144000 lines.. Thanks and regards

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• What is the name of |> in F# and what does it do?

  - by Mark Pearl

  A real F# noob question, but what is | called and what does it do?

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• Making links clickable from comments in php

  - by neat

  im trying to create functions that will give my chat clickable links.... here are the functions i've created <?php //makes links starting with http clickable function makehttpclickable($text){ return preg_replace('!(((f|ht)tp://)[-a-zA-Z?-??-?()0-9@:%_+.~#?&;//=]+)!i', '<a href="$1">$1</a>', $text); } //makes links starting www. http clickable function clickywww($www){ return preg_replace('!((www)[-a-zA-Z?-??-?()0-9@:%_+.~#?&;//=]+)!i', '<a href="$1">$1</a>', $www); } /function that gives me an error! function clickydotcom($noob){ return preg_replace('!([-a-zA-Z?-??-?()0-9@:%_+.~#?&;//=]+)(\.com)!i'.'!([-a-zA-Z?-??-?()0-9@:%_+.~#?&;//=]+)(\.com)!f', '<a href="$1.com$f">$1.com</a>', $noob); } I've been getting an unkown modifier error. Warning: preg_replace() [function.preg-replace]: Unknown modifier '!' So Anyways any help would be nice on how i can make all types of links clickable

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• Is it possible to configure Apache to host both an ASP.NET Web Service and a PHP Web site?

  - by Eduardo León

  Noob question (because I'm a noob when it comes to Web development). I'm not sure whether I should ask it here or at ServerFault. I am developing an ASP.NET Web Service and a PHP Web site consuming the Web Service. They are meant to be run on different machines. However, only for development purposes, I need to run both on my machine. I cannot use virtual machines. I would like to know if it is possible to configure IIS Apache to host both my Web Service and my Web site? Or, do I need to host the PHP site using Apache? I am using IIS 7.5 Apache HTTP Server 2.2 (NOTE: I have nothing against Apache. In fact, so far I like it more than IIS, however, I would rather not have two Web server applications installed in the same machine.) PHP 5.3.4 .NET Framework 2.0 3.0 or 3.5 (whichever comes with Visual Studio 2008) mod_aspdotnet for Apache 2.2

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• Using JS Methods in jQuery

  - by Wasabi

  In the following code snippet, the String.fromCharCode is used, can all JS methods be used within jQuery? Perhaps a noob question, but better to ask and prove a noob, then assume and be a fool. // Invoke setBodyClass when a key is pressed $(document).keyup(function(){ switch (String.fromCharCode(event.keyCode)){ case 'D': setBodyClass('default'); break; case 'N': setBodyClass('narrow'); break; case 'L': setBodyClass('large'); break; } });//end keyup

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• I'm not sure what Option explicit means?

  - by phearn

  Is it about case sensitivity? Complete noob here.

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• JavaScript Prototype and Encapsulation

  - by Adam Davies

  Sorry I'm probably being a realy noob here...but: I have the following javascript object: jeeni.TextField = (function(){ var tagId; privateMethod = function(){ console.log("IN: privateMethod"); } publicMethod = function(){ console.log("IN: publicMethod: " + this.tagId); } jeeni.TextField = function(id){ console.log("Constructor"); this.tagId = id; } jeeni.TextField.prototype = { constructor: jeeni.TextField, foo: publicMethod }; return jeeni.TextField; }()); Now when I run the following code I get the corresponding result: var textField1 = new jeeni.TextField(21); // Outputs: Constructor textField1.foo(); // Outputs: IN: publicMethod: 21 console.log(textField1.tagId); // Outputs: 21 console.log(textField1.privateMethod); // Outputs: undefined So my question is why is privateMethod hidden and tagId is not. I want them both to be private scope. Please help a noob. Thanks

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• Sharepoint always down on the weekend?

  - by TheGambler

  For some reason, our sharepoint site always goes down on Saturday. It's the stangest thing and I can't figure out why. I'm a total noob at sharepoint and have been thrown into being the go to guy for sharepoint with my current employer. I've tried bouncing IIS on Fridays to see if there is anything I can do before hand. Is there anything that might be scheduled that I may not know about that would cause sharepoint to go down? Remember I'm a total noob as sharepoint. Thanks to all that reply. Edit: Also this our front-end and database instances are on virtual servers.

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• Can't get MySQL to install

  - by James Marthenal

  I'd like to think I know what I'm doing in a Unix shell but maybe not. I made a mistake in a configuration file for MySQL, so I decided to just uninstall it and then reinstall it, so I did: sudo apt-get --purge remove mysql-server mysql-server-5.0 mysql-client The files were deleted, so I then tried to install it, but it didn't ask me for a root password or anything else, so I uninstalled it using the above command again and then did sudo rm -rf /etc/mysql sudo rm /etc/init.d/mysql sudo rm -rf /var/lib/mysql* I then restarted the computer then installed it again: sudo apt-get install mysql-server mysql-client It asked for a root password, and everything looked like it would work, until I saw this: $ sudo apt-get install mysql-server mysql-client Reading package lists... Done Building dependency tree Reading state information... Done The following extra packages will be installed: mysql-server-5.0 Suggested packages: tinyca The following NEW packages will be installed: mysql-client mysql-server mysql-server-5.0 0 upgraded, 3 newly installed, 0 to remove and 1 not upgraded. Need to get 0B/27.4MB of archives. After this operation, 86.7MB of additional disk space will be used. Do you want to continue [Y/n]? y WARNING: The following packages cannot be authenticated! mysql-server-5.0 mysql-client mysql-server Authentication warning overridden. Preconfiguring packages ... Can't exec "/tmp/mysql-server-5.0.config.28101": Permission denied at /usr/share/perl/5.10/IPC/Open3.pm line 168. open2: exec of /tmp/mysql-server-5.0.config.28101 configure failed at /usr/share/perl5/Debconf/ConfModule.pm line 59 mysql-server-5.0 failed to preconfigure, with exit status 255 Selecting previously deselected package mysql-server-5.0. (Reading database ... 160284 files and directories currently installed.) Unpacking mysql-server-5.0 (from .../mysql-server-5.0_5.0.51a-24+lenny5_amd64.deb) ... Selecting previously deselected package mysql-client. Unpacking mysql-client (from .../mysql-client_5.0.51a-24+lenny5_all.deb) ... Selecting previously deselected package mysql-server. Unpacking mysql-server (from .../mysql-server_5.0.51a-24+lenny5_all.deb) ... Processing triggers for man-db ... Setting up mysql-server-5.0 (5.0.51a-24+lenny5) ... Stopping MySQL database server: mysqld. /var/lib/dpkg/info/mysql-server-5.0.postinst: line 144: /etc/mysql/conf.d/old_passwords.cnf: No such file or directory dpkg: error processing mysql-server-5.0 (--configure): subprocess post-installation script returned error exit status 1 Setting up mysql-client (5.0.51a-24+lenny5) ... dpkg: dependency problems prevent configuration of mysql-server: mysql-server depends on mysql-server-5.0; however: Package mysql-server-5.0 is not configured yet. dpkg: error processing mysql-server (--configure): dependency problems - leaving unconfigured Errors were encountered while processing: mysql-server-5.0 mysql-server E: Sub-process /usr/bin/dpkg returned an error code (1) Now I can't seem to figure out what to do. I just want to get a clean MySQL installation at this point. I'm running the latest stable release of Debian. All help is appreciated—thanks! Edit: I looked at this similar question, which suggests that I uninstall mysql-common, but when I try to do so I see: The following packages will be REMOVED: apache2 apache2-mpm-prefork apache2-utils apache2.2-common git-svn libapache2-mod-php5 libapache2-mod-python libapache2-svn libaprutil1 libdbd-mysql-perl libdbd-mysql-rubygem libmysql-ruby libmysql-ruby1.8 libmysql-rubygem libmysqlclient15-dev libmysqlclient15off librdf-perl librdf0 libserf-0-0 libsvn-perl libsvn1 mysql-client-5.0 mysql-common mytop ndn-apache22-php5 ndn-apache22-svn ndn-interpreters ndn-lighttpd ndn-netsaint-plugins ndn-perl-modules ndn-php5-cgi ndn-php5-xcache ndn-php53 ndn-php53-suhosin ndn-rubygems php5 php5-mcrypt php5-mysql proftpd proftpd-mod-mysql python-django python-mysqldb python-subversion python-svn subversion subversion-tools trac zendoptimizer 0 upgraded, 0 newly installed, 48 to remove and 1 not upgraded. Eeek! Any suggestions?

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• Why is my machine unable to mount my SMB drives ("CIFS VFS: Error connecting to socket. Aborting operation", return code -115)?

  - by downbeat

  I have a machine running Precise (12.04 x64), and I cannot mount my SMB drives (I have 3, we'll call them public, private and download). It used to work (a week or two ago) and I didn't touch fstab! The machine hosting the shares is a commercial NAS, and I'm not seeing anything that would indicate it's an issue with the NAS. I have an older machine which I updated to Precise at the same time (both fresh installed, not dist-upgrade), so should have a very similar configuration. It is not having any problems. I am not having problems on windows machines/partitions either, only one of my Precise machines. The two machines are using identical entries in fstab and identical /etc/samba/smb.conf files. I don't think I've ever changed smb.conf (has never mattered before). My fstab entries all basically look like this: //10.1.1.111/public /media/public cifs credentials=/home/downbeat/.credentials,iocharset=utf8,uid=downbeat,gid=downbeat,file_mode=0644,dir_mode=0755 0 0 Here's the dmesg output on boot: [ 51.162198] CIFS VFS: Error connecting to socket. Aborting operation [ 51.162369] CIFS VFS: cifs_mount failed w/return code = -115 [ 51.194106] CIFS VFS: Error connecting to socket. Aborting operation [ 51.194250] CIFS VFS: cifs_mount failed w/return code = -115 [ 51.198120] CIFS VFS: Error connecting to socket. Aborting operation [ 51.198243] CIFS VFS: cifs_mount failed w/return code = -115 There are no other errors I see in the dmesg output. Originally when I ran 'testparm -s', the output contained these lines ERROR: lock directory /var/run/samba does not exist ERROR: pid directory /var/run/samba does not exist Here's the samba related programs I have installed: $ dpkg --list|grep -i samba ii libpam-winbind 2:3.6.3-2ubuntu2.3 Samba nameservice and authentication integration plugins ii libwbclient0 2:3.6.3-2ubuntu2.3 Samba winbind client library ii nautilus-share 0.7.3-1ubuntu2 Nautilus extension to share folder using Samba ii python-smbc 1.0.13-0ubuntu1 Python bindings for Samba clients (libsmbclient) ii samba-common 2:3.6.3-2ubuntu2.3 common files used by both the Samba server and client ii samba-common-bin 2:3.6.3-2ubuntu2.3 common files used by both the Samba server and client ii winbind 2:3.6.3-2ubuntu2.3 Samba nameservice integration server $ dpkg --list|grep -i smb ii dmidecode 2.11-4 SMBIOS/DMI table decoder ii libsmbclient 2:3.6.3-2ubuntu2.3 shared library for communication with SMB/CIFS servers ii python-smbc 1.0.13-0ubuntu1 Python bindings for Samba clients (libsmbclient) ii smbclient 2:3.6.3-2ubuntu2.3 command-line SMB/CIFS clients for Unix ii smbfs 2:5.1-1ubuntu1 Common Internet File System utilities - compatibility package $ dpkg --list|grep -i cifs ii cifs-utils 2:5.1-1ubuntu1 Common Internet File System utilities ii libsmbclient 2:3.6.3-2ubuntu2.3 shared library for communication with SMB/CIFS servers ii smbclient 2:3.6.3-2ubuntu2.3 command-line SMB/CIFS clients for Unix I originally noticed that my other machine had "libpam-winbind" and "nautilus-share" installed and the machine with the issue did not. Installing those two packages solved my errors with 'testparm -s', but did not fix my issue. Finally, I tried to purge and reinstall these packages smbclient smbfs cifs-utils samba-common samba-common-bin Still no luck. Again, it used to work; now it doesn't. Very similarly configured machine works (but some packages are out of date on the working machine). The NAS has only one interface/IP address, nmblookup works to find it's IP from it's hostname (from the machine with the issue) and it responds to a ping. Please any help would be great. I've been searching on AskUbuntu, SuperUser, ubuntuforums and plain old search engines for a week now and it's driving me crazy!

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• apt-get upgrade stuck at the same package

  - by decibyte

  Current status I've started to suspect this is not an Ubuntu issue, but related to the internet connection here at my work. Until I'm sure, Im leaving my question below: Original question I'm stuck, can't upgrade my system. Running sudo apt-get upgrade gives me the following: mmm@alalunga:~$ sudo apt-get upgrade Reading package lists... Done Building dependency tree Reading state information... Done The following packages have been kept back: ginn libgrip0 linux-generic-pae linux-headers-generic-pae linux-image-generic-pae The following packages will be upgraded: apport apport-gtk bind9-host build-essential dhcp3-client dhcp3-common dnsutils eog evince evince-common firefox firefox-branding firefox-dbg firefox-globalmenu firefox-gnome-support firefox-locale-en gimp gimp-data gir1.2-totem-1.0 glib-networking glib-networking-common glib-networking-services gnupg gpgv icedtea-6-jre-cacao icedtea-6-jre-jamvm icedtea-6-plugin icedtea-netx icedtea-netx-common icedtea-plugin isc-dhcp-client isc-dhcp-common libapache2-mod-php5 libart-2.0-2 libbind9-80 libdns81 libevince3-3 libgimp2.0 libisc83 libisccc80 libisccfg82 liblwres80 libssl-dev libssl-doc libssl1.0.0 libtotem0 linux-firmware linux-libc-dev openjdk-6-jre openjdk-6-jre-headless openjdk-6-jre-lib openssl php-pear php5-cli php5-common php5-curl php5-dev php5-gd php5-mysql php5-xsl policykit-1-gnome python-apport python-django python-gst0.10 python-problem-report resolvconf thunderbird thunderbird-globalmenu thunderbird-gnome-support totem totem-common totem-mozilla totem-plugins xserver-xorg-input-synaptics 74 upgraded, 0 newly installed, 0 to remove and 5 not upgraded. Need to get 317 MB/327 MB of archives. After this operation, 1.481 kB of additional disk space will be used. Do you want to continue [Y/n]? Get:1 http://archive.ubuntu.com/ubuntu/ precise-updates/main openjdk-6-jre-headless i386 6b24-1.11.4-1ubuntu0.12.04.1 [27,3 MB] Get:2 http://archive.ubuntu.com/ubuntu/ precise-updates/main openjdk-6-jre-headless i386 6b24-1.11.4-1ubuntu0.12.04.1 [27,3 MB] Get:3 http://archive.ubuntu.com/ubuntu/ precise-updates/main openjdk-6-jre-headless i386 6b24-1.11.4-1ubuntu0.12.04.1 [27,3 MB] Get:4 http://archive.ubuntu.com/ubuntu/ precise-updates/main openjdk-6-jre-headless i386 6b24-1.11.4-1ubuntu0.12.04.1 [27,3 MB] Get:5 http://archive.ubuntu.com/ubuntu/ precise-updates/main openjdk-6-jre-headless i386 6b24-1.11.4-1ubuntu0.12.04.1 [27,3 MB] Get:6 http://archive.ubuntu.com/ubuntu/ precise-updates/main openjdk-6-jre-headless i386 6b24-1.11.4-1ubuntu0.12.04.1 [27,3 MB] Get:7 http://archive.ubuntu.com/ubuntu/ precise-updates/main openjdk-6-jre-headless i386 6b24-1.11.4-1ubuntu0.12.04.1 [27,3 MB] 9% [7 openjdk-6-jre-headless 27,3 MB/27,3 MB 100%] It keeps downloading the package openjdk-6-jre-headless, then does nothing for a while (hanging on what's the last line above), then download the package again. It's at its 13th download attempt at the moment of writing. The actual downloads seem to be done just fine, but whatever it does after downloading seems to be failing. I tried removing openjdk-6, but then it wanted to install openjdk-7 instead, with the same result, hanging at openjdk-7-jre-headless instead. I also tried changing servers from my local (Danish) to the main server. No luck. It's also keeping me from upgrading alle the other packages. What to do? Update After following instructions in the answer by @lpanebr, it is now stuck at the linux-firmware package. So, maybe it's a more general problem than being related to specific package(s)? Although it did download some packages without problems before getting stuck at linux-firmware.

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• Government Mandates and Programming Languages

  A recent SEC proposal (which, at over 600 pages, I havent read in any detail) includes the following: We are proposing to require the filing of a computer program (the waterfall computer program, as defined in the proposed rule) of the contractual cash flow provisions of the securities in the form of downloadable source code in Python, a commonly used computer programming language that is open source and interpretive. The computer program would be tagged in XML and required to be filed with the Commission as an exhibit. Under our proposal, the filed source code for the computer program, when downloaded and run (by loading it into an open Python session on the investors computer), would be required to allow the user to programmatically input information from the asset data file that we are proposing to require as described above. We believe that, with the waterfall computer program and the asset data file, investors would be better able to conduct their own evaluations of ABS and may be less likely to be dependent on the opinions of credit rating agencies. With respect to any registration statement on Form SF-1 (Section 239.44) or Form SF-3 (Section 239.45) relating to an offering of an asset-backed security that is required to comply with Item 1113(h) of Regulation AB, the Waterfall Computer Program (as defined in Item 1113(h)(1) of Regulation AB) must be written in the Python programming language and able to be downloaded and run on a local computer properly configured with a Python interpreter. The Waterfall Computer Program should be filed in the manner specified in the EDGAR Filer Manual. I dont see how it can be in investors best interests that the SEC demand a particular programming language be used for software related to investment data.  I have a feeling that investors who use computers at all already have software with which they are familiar, and that the vast majority of them are not running an open source scripting language on their machines to do their financial analysis.  In fact, I would wager that most of them are using tools like Excel, and if they really need to script anything, its being done with VBA in Excel. Now, Im not proposing that the SEC should require that the data be provided in Excel format with VBA scripts included so everyone can easily access the data (despite the fact that this would actually be pretty useful generally).  Rather, I think it is ill-advised for a government agency to make recommendations of this nature, period.  If the goal of the recommendation is to ensure that the way things work is codified in a transparent manner, than I can certainly respect that.  It seems to me that this could be accomplished without dictating the technology to use.  To wit: An Excel document could contain all of the data as well as the formulae necessary, and most likely would not require the end-user to install anything on their machine The SEC could simply create a calculator in the cloud such that any/all investors could use a single canonical web-based (or web service based) tool Millions of Java and .NET developers could write their own implementations You can read more about this issue, including the favorable position on it, on Jayanth Varmas blog. Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Scalable / Parallel Large Graph Analysis Library?

  - by Joel Hoff

  I am looking for good recommendations for scalable and/or parallel large graph analysis libraries in various languages. The problems I am working on involve significant computational analysis of graphs/networks with 1-100 million nodes and 10 million to 1+ billion edges. The largest SMP computer I am using has 256 GB memory, but I also have access to an HPC cluster with 1000 cores, 2 TB aggregate memory, and MPI for communication. I am primarily looking for scalable, high-performance graph libraries that could be used in either single or multi-threaded scenarios, but parallel analysis libraries based on MPI or a similar protocol for communication and/or distributed memory are also of interest for high-end problems. Target programming languages include C++, C, Java, and Python. My research to-date has come up with the following possible solutions for these languages: C++ -- The most viable solutions appear to be the Boost Graph Library and Parallel Boost Graph Library. I have looked briefly at MTGL, but it is currently slanted more toward massively multithreaded hardware architectures like the Cray XMT. C - igraph and SNAP (Small-world Network Analysis and Partitioning); latter uses OpenMP for parallelism on SMP systems. Java - I have found no parallel libraries here yet, but JGraphT and perhaps JUNG are leading contenders in the non-parallel space. Python - igraph and NetworkX look like the most solid options, though neither is parallel. There used to be Python bindings for BGL, but these are now unsupported; last release in 2005 looks stale now. Other topics here on SO that I've looked at have discussed graph libraries in C++, Java, Python, and other languages. However, none of these topics focused significantly on scalability. Does anyone have recommendations they can offer based on experience with any of the above or other library packages when applied to large graph analysis problems? Performance, scalability, and code stability/maturity are my primary concerns. Most of the specialized algorithms will be developed by my team with the exception of any graph-oriented parallel communication or distributed memory frameworks (where the graph state is distributed across a cluster).

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• Bibliography behaves strange in lyx.

  - by Orjanp

  Hi! I have created a Bibliography section in my document written in lyx. It uses a book layout. For some reason it did start over again when I added some more entries. The new entries was made some time later than the first ones. I just went down to key-27 and hit enter. Then it started on key-1 again. Does anyone know why it behaves like this? The lyx code is below. \begin{thebibliography}{34} \bibitem{key-6}Lego mindstorms, http://mindstorms.lego.com/en-us/default.aspx \bibitem{key-7}C.A.R. Hoare. Communicating sequential processes. Communications of the ACM, 21(8):666-677, pages 666\textendash{}677, August 1978. \bibitem{key-8}C.A.R. Hoare. Communicating sequential processes. Prentice-Hall, 1985. \bibitem{key-9}CSPBuilder, http://code.google.com/p/cspbuilder/ \bibitem{key-10}Rune Møllegård Friborg and Brian Vinter. CSPBuilder - CSP baset Scientific Workflow Modelling, 2008. \bibitem{key-11}Labview, http://www.ni.com/labview \bibitem{key-12}Robolab, http://www.lego.com/eng/education/mindstorms/home.asp?pagename=robolab \bibitem{key-13}http://code.google.com/p/pycsp/ \bibitem{key-14}Paparazzi, http://paparazzi.enac.fr \bibitem{key-15}Debian, http://www.debian.org \bibitem{key-16}Ubuntu, http://www.ubuntu.com \bibitem{key-17}GNU, http://www.gnu.org \bibitem{key-18}IVY, http://www2.tls.cena.fr/products/ivy/ \bibitem{key-19}Tkinter, http://wiki.python.org/moin/TkInter \bibitem{key-20}pyGKT, http://www.pygtk.org/ \bibitem{key-21}pyQT4, http://wiki.python.org/moin/PyQt4 \bibitem{key-22}wxWidgets, http://www.wxwidgets.org/ \bibitem{key-23}wxPython GUI toolkit, http://www.wxPython.org \bibitem{key-24}Python programming language, http://www.python.org \bibitem{key-25}wxGlade, http://wxglade.sourceforge.net/ \bibitem{key-26}http://numpy.scipy.org/ \bibitem{key-27}http://www.w3.org/XML/ \bibitem{key-1}IVY software bus, http://www2.tls.cena.fr/products/ivy/ \bibitem{key-2}sdas \bibitem{key-3}sad \bibitem{key-4}sad \bibitem{key-5}fsa \bibitem{key-6}sad \bibitem{key-7} \end{thebibliography}

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