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• How to calculate Centered Moving Average of a set of data in Hadoop Map-Reduce?

  - by 100gods

  I want to calculate Centered Moving average of a set of Data . Example Input format : quarter | sales Q1'11 | 9 Q2'11 | 8 Q3'11 | 9 Q4'11 | 12 Q1'12 | 9 Q2'12 | 12 Q3'12 | 9 Q4'12 | 10 Mathematical Representation of data and calculation of Moving average and then centered moving average Period Value MA Centered 1 9 1.5 2 8 2.5 9.5 3 9 9.5 3.5 9.5 4 12 10.0 4.5 10.5 5 9 10.750 5.5 11.0 6 12 6.5 7 9 I am stuck with the implementation of RecordReader which will provide mapper sales value of a year i.e. of four quarter. The RecordReader Problem Question Thread Thanks

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• Programming tutorials for people with zero experience

  - by www.aegisub.net

  A friend of mine is interested in learning how to program computers, but she knows nothing about programming. I suggested that Python might be a good language to start with, but after some googling, I couldn't find any tutorials that covered both programming and Python in an adequate way. I don't want her to go through the tiresome "learn algorithms in pseudocode first" routine. Instead, I'd like a tutorial that will explain the basic ideas while working towards a real goal, e.g. a very simple console game. Does anyone know of any such tutorials? Do you think that I'm mistaken in how I'm handling this? Is Python a bad choice? I know that something like C, C++ or Java won't work - too many details will be very counterproductive. On the other hand, I think that Lisp might be too mathematical and abstract. Python, on the other hand, will let her even do something like coding primitive graphical games in a short period of time.

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• Rails application and multilingual content, Model dilemma

  - by dakull

  I'm writing in Rails a website that will be multilingual, for the application translation part i will use the simple I18n gem, for messages and everything related. Yet, all the content must be translated, and we're talking about lots of pages, that will be stored into the database ( like articles, news, etc. ) For now, I'm thinking of two approaches: Lets say i have a Pages table, the content in diff. languages, i will be storing it in a different table called PagesContent that will belong_to Pages and also to a Languages table. The problem here, is that I'll essentially duplicate the no. of tables needed. Pros: flexibility, in the box validation To skip that duplication i can serialize a hash into the content column of Pages, containing the translation. The problem here, is validation, arguably more code to write, and less flexibility when adding a new language. Pros: Less tables. Any other idea ?

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• Instance where embedded C++ compilers don't support multiple inheritance?

  - by Nathan

  I read a bit about a previous attempt to make a C++ standard for embedded platforms where they specifically said multiple inheritance was bad and thus not supported. From what I understand, this was never implemented as a mainstream thing and most embedded C++ compilers support most standard C++ constructs. Are there cases where a compiler on a current embedded platform (i.e. something not more than a few years old) absolutely does not support multiple inheritance? I don't really want to do multiple inheritance in a sense where I have a child with two full implementations of a class. What I am most interested in is inheriting from a single implementation of a class and then also inheriting one or more pure virtual classes as interfaces only. This is roughly equivalent to Java/.Net where I can extend only one class but implement as many interfaces as I need. In C++ this is all done through multiple inheritance rather than being able to specifically define an interface and declare a class implements it.

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• Book resources for x86/x64 assembly programming on Win platform

  - by Scott Davies

  Hello, I ran a search for assembly language resources on stackoverflow.com and found some interesting results, but they seemed to boil down to two groups: 1) Assembly references to old ia32 architecture, such as the 80386 to Pentium 2) Windows agnostic books. Most of the commenters make the point that assembler is CPU dependent and that the OS is irrelevant, but it seems pointless to me to pick a book that has assembly examples that refer to MS-DOS interrupts and memory layouts. Likewise, learning assembler on Linux would seem to produce Linux executables Are there any: 1) Modern 2) x86/x64 3) on Windows platform - book resources available ? The reason I am targeting the Win platform is I would like to do low-level, OS internals programming, to supplement my Win C/C++ work. Thanks

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• A general question about compilation and interpretation.

  - by wucnuc

  Hi stackoverflow, I apologize in advance for the possible stupidity of this question. However, the following has been the source of some confusion for me and I know the people here will be able to handily clear up the confusion for me. Basically, I would like to finally understand the relationship between any and all of the following terms. Some of the terms I do actually understand pretty well, but some of them are similar in my mind and I would like to once and for all to see their relationships/distinctions laid out all at once. They are: compiler interpreter bytecode machine code assembler assembly language binary object code executable Ideally, an answer would use examples from Java and C++ and other well-known programming languages that a young-ish student like me would be familiar with. Also, if you want to throw in any other useful terms that would be fine too :)

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• MonoDevelop in Linux -- Terminal Commands

  - by Sandeep Bansal

  Hi everyone, I want to make a C# app in Mono as it's the only programming language I'm mostly comfortable with. Anyway, ATI Drivers on Linux do not have a Fan control feature and therefore the cards to tend to heat up. For me I prefer to have a cooler card. What I want to do is run a command such as: aticonfig --pplib-cmd 'set fanspeed 0 70' In a application but I the thing is..How can I run that code so it works, I am currently running Ubuntu 10.04, and it does work in the terminal, but I want to implement it into an application. Thanks

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• What could possibly cause this error when declaring an object inside a class?

  - by M4design

  I'm battling with this assignment :) I've got two classes: Ocean and Grid. When I declare an object of the Grid inside the Ocean: unsigned int sharkCount; Grid grid; The compiler/complainer says: error C2146: syntax error : missing ';' before identifier 'grid' Can you possibly predict what produces this error with the limited info I provided? It seems that as if the Ocean doesn't like the Grid class. Could this be because of the poor implementation of the grid class. BTW the Grid has a default constructor. Yet the error happens in compiling time!. EDIT: They're each in separate header file, and I've included the Grid.h in the Ocean.h.

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• comparing two end() iterators

  - by aafoo

  list<int> foo; list<int> foo2; list<int>::iterator foo_end = foo.end(); list<int>::iterator foo2_end = foo2.end(); for (list<int>::iterator it = foo.begin(); it != foo2_end; ++foo) <- notice != comparison here { ... it this allowed? will it work correctly. I am inclined to think that this is implementation dependent, anyone knows if standard says anything about this?

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• Is there a shorthand version of HTML available?

  - by monguin

  I remember reading an article about a shorthand version, or extension, of HTML a few months ago. Its purpose was to make HTML code significantly more concise, by removing end tags, and it may have allowed loops of some sort as well. I want to use it now, but I can't seem to remember what it was called. Searching online, I found HAML, but HAML syntax doesn't look like the example that I remember from the article. The syntax from the article made use of right angle brackets, which were a sort of replacement for indentation. Can anyone identify this language?

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• Fixing too long comment lines in Vim

  - by Tomek Kaftal

  I'm looking for a convenient way to fix comments where line lengths exceed a certain number of characters in Vim. I'm fine with doing this manually with code, especially since it's not that frequent, plus refactoring long lines is often language, or even code-style dependent, but with comments this is pure drudgery. What happens is I often spot some issue in a comment, tweak one or two words and the line spills out of the, say, 80 character limit. I move the last word to the next line and then the next line spills, and so on. Does anyone know a way to do this automatically in Vim?

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• learning and "singing" Ruby with Sinatra

  - by microspino

  Hello I'm trying to improve my ruby knowledge by reading The Ruby Programming Language book. Reading Coders at work I saw that lot of the interviewees suggest to dive into a project source code to learn best practices to be aware of bad habits and of course to take new inspirations for how to do things. I decided to pick a project as more self contained as I could find. My choice was Sinatra since It's 1000 LOC. Is It a good project to learn? Do you suggest another one more simple (i.e. less LOCs)? I've tried to see rails machinery before but I came out scared from It.

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• Is there a way to refactor this javascript/jquery?

  - by whyzee

  switch (options.effect) { case 'h-blinds-fadein': $('.child').each(function (i) { $(this).stop().css({opacity:0}).delay(100 * i).animate({ 'opacity': 1 }, { duration: options.speed, complete: (i !== r * c - 1) || function () { $(this).parent().replaceWith(prev); options.cp.bind('click',{effect: options.effect},options.ch); } }); }); break; case 'h-blinds-fadein-reverse': $('.child').each(function (i) { $(this).stop().css({opacity:0}).delay(100 * (r * c - i)).animate({ 'opacity': 1 }, { duration: options.speed, complete: (i !== 0) || function () { $(this).parent().replaceWith(prev); options.cp.bind('click',{effect: options.effect},options.ch); } }); }); break; ....more cases } I have alot of similiar other cases. One way i could think of is to write functions ? i'm not sure i'm still fairly new to the language

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• Error message when trying to insert method into touchesBegan

  - by Rob

  I am trying to create a new method within my TapDetectingImageView file and it's giving me a warning that it cannot find the method even though I have it declared in the .h file. The specific three warnings all point to the @end line in the .m file when I build it and they say: "Incomplete implementation of class 'TapDetectingImageView' ; 'Method definition for '-functionA:' not found" ; "Method definition for '-functionB:' not found" What am I missing? Am I not allowed to do this in a protocol file like TapDetectingImageView? In my .h file is: @interface TapDetectingImageView : UIImageView <AVAudioPlayerDelegate> { id <TapDetectingImageViewDelegate> delegate; } @property (nonatomic, assign) id <TapDetectingImageViewDelegate> delegate; -(void) functionA:(NSString*)aVariable; -(void) functionB:(NSString*)aVariable; @end In my .m file is: -(void)functionA:(NSString*)aVariable { // do stuff in this function with aVariable } -(void)functionB:(NSString*)aVariable { // do stuff in this function with aVariable }

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• C++ - how does Sleep() and cin work?

  - by quano

  Just curious. How does actually the function Sleep() work (declared in windows.h)? Maybe not just that implementation, but anyone. With that I mean - how is it implemented? How can it make the code "stop" for a specific time? Also curious about how cin and those actually work. What do they do exactly? The only way I know how to "block" something from continuing to run is with a while loop, but considering that that takes a huge amount of processing power in comparison to what's happening when you're invoking methods to read from stdin (just compare a while (true) to a read from stdin), I'm guessing that isn't what they do.

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• iPhone app - Terminating DUE TO UNCAUGHT EXCEPTION

  - by Kenneth

  Hi Guys, im trying to switch views between view controllers but it crashed. so basically im switching from mainScreen to test i get an error in the Debugger 0x01d6a000 <+0000 push %ebp 0x01d6a001 <+0001 mov %esp,%ebp 0x01d6a003 <+0003 int3 0x01d6a004 <+0004 leave (HIGHLIGHTED) 0x01d6a005 <+0005 ret 0x01d6a006 <+0006 nopw %cs:0x0(%eax,%eax,1) mainscreen.h import @interface MainScreen : UIViewController { } -(IBAction)btnFirstPage:(id)sender; @end mainscreen.m import "MainScreen.h" import "test.h" @implementation MainScreen -(IBAction)btnFirstPage:(id)sender{ test1 = [[test1 alloc] initWithNibName:@"test" (test may not respond to -alloc) bundle:nil]; [self.view addSubview:test1.view]; .................etc test.h import @interface test : UIViewController { } @end test.m etc (did not edit)

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• Using special characters as keywords in latex listings package

  - by sha

  Hi, I am using the listings package for latex. I am using the SQL language definition and am adding some new keywords that I need, using morekeywords=. I have trouble defining some special characters as keywords, for example, I need [], <, &, and - to be considered as keywords and use the keyword style. I have tried adding these verbatim or with a preceding backslash. It did not work. Your help would be greatly appreciated. Thanks.

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• Enums With Default Throw Clause?

  - by Tom Tresansky

  I noticed the following in the Java Language spec in the section on enumerations here: link switch(this) { case PLUS: return x + y; case MINUS: return x - y; case TIMES: return x * y; case DIVIDE: return x / y; } throw new AssertionError("Unknown op: " + this); However, looking at the switch statement definition section, I didn't notice this particular syntax (the associated throw statement) anywhere. Can I use this sort of "default case is throw an exception" syntactic sugar outside of enum definitions? Does it have any special name? Is this considered a good/bad practice for short-cutting this behavior of "anything not in the list throws an exception"?

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• In c++ is there any Events/delegates/interfaces/notifications! anything?

  - by Bach

  Say i have these classes ViewA and ViewB In objective C using the delegate pattern I could do @protocol ViewBDelegate{ - (void) doSomething(); } then in ViewB interface: id<ViewBDelegate> delegate; then in ViewA implementation i set the delegate: viewB.delegate = self; and now I can call in doSomething from viewB onto any that unknown type delegate. [delegate doSomething]; "C++ How to Program" has been the worse read an can't find simple examples that demonstrates basic design patterns. What i'm looking for in C++ is: events ActionScript and java either delegates or notifications in Objective C anything that allows class A, Class B and Class C to know that ClassX didSomething()!!! thanks

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• How do I connect two apps

  - by sevaxx

  I am considering building an app in C++ that will be parsing text from the web and create some statistical results. These results I want to be fed in an external app in real time. The external app (to whose code I have no access, but can ask for a - paid - custom made addition) will then need some code to read and use these results. I am wondering what would be the best way to interconnect the two apps, in terms of speed and ease of implementation. I am considering : disk I/O (slow) a Windows service a DLL a web service a web page Perhaps I am missing a better solution ? Thank you.

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• window.onfocus and window.onblur not working in IE8

  - by AshokD

  Both the events are getting fired at the time onblur event. <script src="js/jquery-1.7.2.js" type="text/javascript"></script> <script language="javascript" type="text/javascript"> window.onfocus = function() { $('#msg').html($('#msg').html() + '<br/> focus'); }; window.onblur = function() { $('#msg').html($('#msg').html() + '<br/> Blur'); }; </script> <div id="msg"> </div>

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• Error message in XSLT with C# extension function

  - by iHeartGreek

  Hi! I am received the following error while trying to implement a C# extension function in XSLT. Extension function parameters or return values which have CLR type 'Char[]' are not supported.** code: <xsl:variable name="stringList"> <xsl:value-of select="extension:GetList('AAA BBB CCC', ' ')"/> </xsl:variable> <msxsl:script language="C#" implements-prefix="extension"> <![CDATA[ public string[] GetList(string str, char[] delimiter) { ... ... return str.Split(delimiter, StringSplitOptions.None); } ]]> </msxsl:script> Can someone explain this error message and how to get past it? Thanks!

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• Simple Serialization Faster Than JSON? (in Ruby)

  - by Sinan Taifour

  I have an application written in ruby (that runs in the JRuby VM). When profiling it, I realized that it spends a lot (actually almost all of) its time converting some hashes into JSON. These hashes have keys of symbols, values of other similar hashes, arrays, strings, and numbers. Is there a serialization method that is suitable for such an input, and would typically run faster than JSON? It would preferable if it is has a Java or JRuby-compatible gem, too. I am currently using the jruby-json gem, which is the fastest JSON implementation in JRuby (as I am told), so the move will most likely be to a different serialization method rather than just a different library. Any help is appreciated! Thanks.

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• Compilation hangs for a class with field double d = 2.2250738585072012e-308

  - by 01es

  I have come across an interesting situation. A coworker committed some changes, which would not compile on my machine neither from the IDE (Eclipse) nor from a command line (Maven). The problem manifested in the compilation process taking 100% CPU and only killing the process would help to stop it. After some analysis the cause of the problem was located and resolved. It turned out be a line "double d = 2.2250738585072012e-308" (without semicolon at the end) in one of the interfaces. The following snipped duplicates it. public class WeirdCompilationIssue { double d = 2.2250738585072012e-308 } Why would compiler hang? A language edge case?

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• Java - JPA - Generators - @SequenceGenerator

  - by Yatendra Goel

  I am learning JPA and have confusion in the @SequenceGenerator annotation. Upto my understanding, it automatically assigns a value to numeric identity fields/properties of an entity. Q1. Does this sequence generator make use of the database's increasing numeric value generating capability or generates the number on his own? Q2. If JPA uses database auto increement feauture, then will it work with datastores that don't have auto increement feature? Q3. If JPA generate numeric value on his own, then how the JPA implementation knows which value to generate next? Does it consult with the database first to see what value was stored last so as to generate the value (last + 1). ====================================================================================== Q4. Please also throw some light on sequenceName and allocationSize properties of @SequenceGenerator annotation.

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