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• Read/Write/Find/Replace huge csv file

  - by notapipe

  I have a huge (4,5 GB) csv file.. I need to perform basic cut and paste, replace operations for some columns.. the data is pretty well organized.. the only problem is I cannot play with it with Excel because of the size (2000 rows, 550000 columns). here is some part of the data: ID,Affection,Sex,DRB1_1,DRB1_2,SENum,SEStatus,AntiCCP,RFUW,rs3094315,rs12562034,rs3934834,rs9442372,rs3737728 D0024949,0,F,0101,0401,SS,yes,?,?,A_A,A_A,G_G,G_G D0024302,0,F,0101,7,SN,yes,?,?,A_A,G_G,A_G,?_? D0023151,0,F,0101,11,SN,yes,?,?,A_A,G_G,G_G,G_G I need to remove 4th, 5th, 6th, 7th, 8th and 9th columns; I need to find every _ character from column 10 onwards and replace it with a space ( ) character; I need to replace every ? with zero (0); I need to replace every comma with a tab; I need to remove first row (that has column names; I need to replace every 0 with 1, every 1 with 2 and every ? with 0 in 2nd column; I need to replace F with 2, M with 1 and ? with 0 in 3rd column; so that in the resulting file the output reads: D0024949 1 2 A A A A G G G G D0024302 1 2 A A G G A G 0 0 D0023151 1 2 A A G G G G G G (both input and output should read one line per row, ne extra blank row) Is there a memory efficient way of doing that with java(and I need a code to do that) or a usable tool for playing with this large data so that I can easily apply Excel functionality..

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• log4j - when to use PropertyConfigurator in tests?

  - by waitinforatrain

  Hi, I know you're supposed to only load log4j properties once, so what is standard practice when you're doing unit tests? Should I load it in every unit test file? Should I put it in jUnit's setUp() method? Thanks

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• PHP hashing function not working properly

  - by Jordan Foreman

  So I read a quick PHP login system securing article, and was trying to sort of duplicate their hashing method, and during testing, am not getting the proper output. Here is my code: function decryptPassword($pw, $salt){ $hash = hash('sha256', $salt . hash('sha256', $pw)); return $hash; } function encryptPassword($pw){ $hash = hash('sha256', $pw); $salt = substr(md5(uniqid(rand(), true)), 0, 3); $hash = hash('sha265', $salt . $hash); return array( 'salt' => $salt, 'hash' => $hash ); } And here is my testing code: $pw = $_GET['pw']; $enc = encryptPassword($pw); $hash = $enc['hash']; $salt = $enc['salt']; echo 'Pass: ' . $pw . '<br />'; echo 'Hash: ' . $hash . '<br />'; echo 'Salt: ' . $salt . '<br />'; echo 'Decrypt: ' . decryptPassword($hash, $salt); Now, the output of this should be pretty obvious, but unfortunately, the $hash variable always comes out empty! I'm trying to figure out what the problem could be, and my only guess would be the second $hash assignment line in the encryptPassword(..) function. After a little testing, I've determined that the first assignment works smoothly, but the second does not. Any suggestions? Thanks SO!

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• Load image from string

  - by zaf

  Given a string containing jpeg image data, is it possible to load this directly in pygame? I've tried using StringIO but failed and I don't completely understand the 'file-like' object concept. Currently, as a workaround, I'm saving to disk and then loading an image the standard way: # imagestring contains a jpeg f=open('test.jpg','wb') f.write(imagestring) f.close() image=pygame.image.load('test.jpg') Any suggestions on improving this so that we avoid creating a temp file?

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• VS2005 COMPLITION PROBLEM WITH SETTINGS

  - by vijay.j

  Hi all i am trying to integrating PJNSMTPCONNECTION CLASSES in my project,they say that those classes donot uses mfc. MY project is with the setting like MT, and using standard library linking, when i try to complie i am getting CSTRING not defined and fatal error C1189: #error : WINDOWS.H already included. MFC apps must not #include if i include afx.h and remove windows.h, i am getting iDLLMain aleardy defined like errors

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• How to keep track of call statistics? C++

  - by tf.rz

  I'm working on a project that delivers statistics to the user. I created a class called Dog, And it has several functions. Speak, woof, run, fetch, etc. I want to have a function that spits out how many times each function has been called. I'm also interested in the constructor calls and destructor calls as well. I have a header file which defines all the functions, then a separate .cc file that implements them. My question is, is there a way to keep track of how many times each function is called? I have a function called print that will fetch the "statistics" and then output them to standard output. I was considering using static integers as part of the class itself, declaring several integers to keep track of those things. I know the compiler will create a copy of the integer and initialize it to a minimum value, and then I'll increment the integers in the .cc functions. I also thought about having static integers as a global variable in the .cc. Which way is easier? Or is there a better way to do this? Any help is greatly appreciated!

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• Android: Learning the platform, have any app suggestions?

  - by David

  I'm beginning to learn mobile programming on the Android platform. I'm up for working with any particular base SDK. I just want to hear some suggestions from the community about what types of applications I should start with to help learn more advanced interactions with the platform. There are of course the Standard Hello World, calculator, etc. But by now I am bored with all of those. What do you all make when learning a new language?

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• RFCOMM Before Android 2.0?

  - by Brad Hein

  I have several apps which I wrote using the standard SDK. They all connect to RFCOMM devices using bluetooth, so at present, I can only support devices which are 2.0 or newer. What options are available for backporting a bluetooth app to pre-2.0 apps while re-writing as little code as possible? Thank you.

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• Anything like VisualSVN Server for Mercurial?

  - by Billy ONeal

  VisualSVN server is a nice piece of software; particularly in that it uses the builtin Windows authentication mechanism on my server. I'd like to try to start using Mercurial though, and I'd like to keep the Windows authentication scheme. Is there some way to set this kind of thing up using the tools available on Windows Server 2008 R2 Standard (in particular, IIS 7)?

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• What type of database schema should I use for storing and working with geolocation data?

  - by gsiener

  I'm creating an application that will store geolocation data for specific transactions. Should I store a simple lat/long or is there a more preferred standard? What datatypes should I use to allow for switching to NoSQL in the future?

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• Why use Apache over NGINX/Cherokee/Lighttpd?

  - by codysoyland

  Apache has been the de facto standard web server for over a decade, but recent years have brought us web servers that consume less RAM and handle many more requests per second using fewer threads and asynchronous i/o. In my opinion, I also find the configuration of these servers to be more straightforward and minimal. Why do people use Apache when asynchronous servers are so much more lightweight? Is there any clear benefit?

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• Default MVC Web Application Database

  - by wows

  When setting up a new ASP.NET MVC Web Application, the default connection string inside Web.Config is something like this: connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|aspnetdb.mdf;User Instance=true" I'm just wanting to play around with logging in and registering, etc but when I run the app it obviously can't find a SQL database. What database with what tables do I need to setup to do this? I have SQL Server 2005 Standard installed on my system, is that enough? Thanks.

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• How to write to a Text File in Pipe delimited format from MS Sql Server / ASP.Net?

  - by NJTechGuy

  I have a text file which needs to be constantly updated (regular intervals). All I want is the syntax and possibly some code that outputs data from a MS Sql Database using ASP.Net. The code I have so far is : <%@ Import Namespace="System.IO" %> <script language="vb" runat="server"> sub Page_Load(sender as Object, e as EventArgs) Dim FILENAME as String = Server.MapPath("Output.txt") Dim objStreamWriter as StreamWriter ' If Len(Dir$(FILENAME)) > 0 Then Kill(FILENAME) objStreamWriter = File.AppendText(FILENAME) objStreamWriter.WriteLine("A user viewed this demo at: " & DateTime.Now.ToString()) objStreamWriter.Close() Dim objStreamReader as StreamReader objStreamReader = File.OpenText(FILENAME) Dim contents as String = objStreamReader.ReadToEnd() lblNicerOutput.Text = contents.Replace(vbCrLf, "<br>") objStreamReader.Close() end sub </script> <asp:label runat="server" id="lblNicerOutput" Font-Name="Verdana" /> With PHP, it is a breeze, but with .Net I have no clue. If you could help me with the database connectivity and how to write the data in pipe delimited format to an Output.txt file, that had be awesome. Thanks guys!

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• Is there a way to comment out markup in an .ASPX page?

  - by MikeJ

  Is there a way to comment out markup in an .ASPX page so that it isnt delivered to the client? I have tried the standard comments but this just gets delivered as a comment and doesn't prevent the control from rendering. Any suggestions would help

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• Is it possible to add a Silverlight 3 out-of-browser application to the add/remove programs list?

  - by Matt Lacey

  Is it possible to include a Silverlight (3) out-of-browser application to the add-or-remove programs list? The intention is to be able to remove the OOB application that way (not just by right-clicking from within the running app)? If the OOB app is installed with a shortcut to the desktop and you try to delete the shortcut you are presented with the standard 'you are just deleting a shortcut if you want to delete the application go to add or remove programs' dialog. I want to tidy up this inconsistency.

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• Necessity of newlines in C: Character sequences recognized as such and simulating line breaks after

  - by Yktula

  Is there a character sequence recognized as a newline that's defined by the C standard and/or recognized by GCC? How can newlines be simulated after preprocessor macros to have them and C code share the same line? #include <stdlib.h> [NEWLINE] int main() { exit(EXIT_SUCCESS); }

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• Which namespace does operator<< (stream) go to?

  - by aaa

  If I have have some overloaded ostream operators, defined for library local objects, is its okay for them to go to std namespace? If I do not declare them in std namespace, then I must use using ns:: operator <<. As a possible follow-up question, are there any operators which should go to standard or global namespace?

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• Estimate Shipping and Tax problem in magento

  - by Ela

  When i added a product and go into Shopping Cart page it does not displaying the standard shipping calculations and once i get into the checkout page and from there when i try to edit the shopping cart it shows the estimate price calculation. Please some one help me

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• What is the best way to iterate over a Dictionary in C#?

  - by Jake Stewart

  I've seen a few different ways to iterate over a Dictionary in C#. Is there a standard way?

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• Extracting exported functions out of a shared lib (ubuntu)

  - by Pingu

  the title already describes my problem. I found this post, but it didn't completely answers my question. With the help of it i got this output from nm... $nm -C -g -D ./libLoggingHandler.so 000000cc A _DYNAMIC ... 000042e0 T write_str(char*, char const*, int*) 00005a78 T RingBuffer::WriteUnlock() ... 00005918 T TraceLines::GetItemSize() ... U SharedMemory::attach(int, void const*, int) ... 00003810 T TraceProfile::FindLineNr(int, int) ... 00002d40 T LoggingHandler::getLogLevel() ... U SharedResource::getSharedResourceKey(char const*, int) ... which are the exported functions? I already found a hint in this post, that the "T" indicates that its getting exported. But if i check the nm manual here, it just says T - The symbol is in the text (code) section. My questions is: Does this output give me the information which functions are exported functions (or variables)? If not, how do i get it? Greetings, Pingu

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• Validate site/domain via javascript

  - by Chez

  I have a standard html form where the user can specify a website/domain: favourite website: [ ] I expect the user to type things like: [www.google.com] [www.yahoo.com] [www.example.co.jp] I want to validate the domain/site via javascript so if a user had typed something wrong: [www...google.com] [www.-example.com] I tell them straight away. Can anybody post this javascript ? Alternatively can anybody point me to a site where I can look at their javascript ? Many Thanks

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• How to use Rx to asynchronously query Twitter search ?

  - by Jalfp

  Hi, I'm thinking about using Rx (Reactive Framework) in order to asynchronously query Twitter search API on a given keyword. The sample app I'd like to build should be able to display new tweets in the console. Do you think it is possible to do that ? Would it be simpler than using standard programming techniques ? How would you do that ? Thank ! Jeremy

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• session variables in an ASP.NET

  - by Beep

  hi guy i am trying to place my session in to a drop down, any help would be great. at the moment it puts the data in to a label, i wish to put it into a dropdown with it adding a new string every time i click button without getting rid of the last default page protected void Button1_Click1(object sender, EventArgs e) { Session["Fruitname"] = TbxName.Text; // my session i have made } output page protected void Page_Load(object sender, EventArgs e) { var fruitname = Session["Fruitname"] as String; // my session ive made fruit.Text = fruitname; // session used in lable } Have Tried var myFruits = Session["Fruitname"] as List<string>; myFruits.Add(listbox1.Text); but i get error when i try to run the program Broken glass thanks for your help, it is still not doing what i need but its getting there. var fruitname = Session["Fruitname"] as String; // my session ive made fruit.Text = string.Join(",", fruitname); // session used in lable this is what is working. i need a dropdown to display all the strings put into TbxName.Text; to output into fruit

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• Jumping onto next string when the condition is met

  - by user98235

  This was a problem related to one of the past topcoder exam problems called HowEasy. Let's assume that we're given a sentence, for instance, "We a1re really awe~~~some" I just wanted to take get rid of every word in the sentence that doesn't contain alphabet characters, so in the above sentence, the desired output would be "We really" The below is the code I wrote (incomplete), and I don't know how to move on to the next string when the condition (the string contains a character that's not alphabet) is met. Could you suggest some revisions or methods that would allow me to do that? vect would be the vector of strings containing the desired output string param; cin>>param; stringstream ss(param); vector<string> vect; string c; while(ss >> c){ for(int i=0; i < c.length(); i++){ if(!(97<=int(c[i])&&int(c[i])<=122) && !(65<=int(c[i])&&int(c[i])<=90)){ //I want to jump onto next string once the above condition is met //and ignore string c; } vect.push_back(c); if (ss.peek() == ' '){ ss.ignore(); } } }

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• Meta keywords question [closed]

  - by Mark

  Hi all, Wheter or not the meta keywords are very usefull i'm still tobbing with this issue: I have some standard keywords to describe my site: tv,webtv,radio,watch,listen,live. Now those keywords are shown on every of my 600+ pages as base-keywords, and then I append page specific keywords after them. Is this right or wrong? So should i have this: tv,webtv,radio,watch,listen,live,cnn,international,stream or cnn,international,stream For live example see seetor.com Kind regards Mark

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