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• two's complement, why the name "two"

  - by lenatis

  i know unsigned,two's complement, ones' complement and sign magnitude, and the difference between these, but what i'm curious about is: why it's called two's(or ones') complement, so is there a more generalize N's complement? in which way did these genius deduce such a natural way to represent negative numbers?

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• What are your favorite programming-related academic papers?

  - by namin

  What are your favorite programming-related / cs academic published papers? It could be a functional pearl, a programming-language paper like those often cited on lambda-the-ultimate.org, etc. Really, anything vaguely related to programming. Please also explain why you like the paper.

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• Dynamic programming - Coin change decision problem?

  - by Tony

  I'm reviewing some old notes from my algorithms course and the dynamic programming problems are seeming a bit tricky to me. I have a problem where we have an unlimited supply of coins, with some denominations x1, x2, ... xn and we want to make change for some value X. We are trying to design a dynamic program to decide whether change for X can be made or not (not minimizing the number of coins, or returning which coins, just true or false). I've done some thinking about this problem, and I can see a recursive method of doing this where it's something like... MakeChange(X, x[1..n this is the coins]) for (int i = 1; i < n; i++) { if ( (X - x[i] ==0) || MakeChange(X - x[i]) ) return true; } return false; Converting this a dynamic program is not coming so easily to me. How might I approach this?

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• What algorithms did Dijkstra develop?

  - by baris_a

  I recently asked a question about one of the Dijkstra’s algorithms (shunting-yard). But almost everyone thought "Dijkstra's algorithm" meant his shortest path algorithm. What other algorithms has Dijkstra developed?

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• I dont understand Access modifiers in OOP (JAVA)

  - by Imran

  I know this is a silly question but i don't understand Access Modifiers in OOP. Why do we make for example in JAVA instance variables private and then use public getter and setter methods to access them? I mean whats the reasoning/logic behind this? You still get to the instance variable but why use setter and getter methods when you can just make your variables public? please excuse my ignorance as i'm simply trying to understand why we do this? Thank you in advance;-)

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• OCR for Devanagari (Hindi / Marathi / Sanskrit)

  - by Egon

  Does anybody have any idea about any recent work being done on optical character recognition for Indian scripts using modern Machine Learning techniques ? I know of some research being done at ISI, calcutta, but nothing new has come up in the last 3-4 years to the best of my knowledge, and OCR for Devanagari is sadly lacking!

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• Image Recognition (Shape recognition)

  - by mqpasta

  I want to recognize the shapes in the picture by template matching.Is the "ExhaustiveTemplateMatching" is the right option given in Aforge.Net for this purpose.Had anyone tried this class and find it working correctly.How accurate and right choice this class is for achieving my purpose.Suggest any other methods or Alogrithms as well for recognizing shapes by matching template.For example Identifying ComboBox in a picture.

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• File library that help creating paths

  - by Skeptic

  I'm looking for a file utilities library that help creating paths, i.e. if I want to create a file in "a/b/c/x/y/z", it will check if each directory exists and creates it if not.

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• What is the most active genetic programming library?

  - by franz

  What genetic programming library, regardless of language, has the most active community and is the most well developed?

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• Dijkstra’s algorithms - a complete list

  - by baris_a

  Hi guys, I have recently asked a question about one of the Dijkstra’s algorithms. But, almost everyone thought it was shortest path. Therefore, I opened this post to gather all the algorithms that were invented by Dijkstra. Please add any if you know. Thanks in advance. 1 ) Shunting-yard algorithm

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• image focus calculation

  - by Oren Mazor

  Hi folks, I'm trying to develop an image focusing algorithm for some test automation work. I've chosen to use AForge.net, since it seems like a nice mature .net friendly system. Unfortunately, I can't seem to find information on building autofocus algorithms from scratch, so I've given it my best try: take image. apply sobel edge detection filter, which generates a greyscale edge outline. generate a histogram and save the standard dev. move camera one step closer to subject and take another picture. if the standard dev is smaller than previous one, we're getting more in focus. otherwise, we've past the optimal distance to be taking pictures. is there a better way? update: HUGE flaw in this, by the way. as I get past the optimal focus point, my "image in focus" value continues growing. you'd expect a parabolic-ish function looking at distance/focus-value, but in reality you get something that's more logarithmic

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• Algorithm to create a x-ray image from a volume

  - by Algorist

  What is the algorithm to create a x-ray image using ray-tracing from a 3-d volume?

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• need help working with the Jericho Html Parser

  - by rookie

  Hi all I've simply used the following program on the url below http://jericho.htmlparser.net/samples/console/src/ExtractText.java My goal is to be able to extract the main body text, to be able to summarize it and present the summarized text as output to the user. My problem is that, I'm not sure how I'd modify the above program to only get the required text from the webpage, without the links or any other information. Again, I'd really appreciate any help I could get. Thanks in advance

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• .htaccess help to RewriteRule

  - by NeoNmaN

  Hello all I have a problem, suprice ;) i use .htaccess in Apache and have a RewriteRule problem my code is RewriteRule ^(.*)$ /system/header_codes.php?oldurl=$1 how can i make if its not have a true ( rewriterule ) soe use this, i will use its becures i create a dyanmic RewriteRule for my customer in my System. i hobe for help here, sorry for bad spelling.

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• Python: List of Modules (>>> help('modules') not working)

  - by Dan

  I wanted a list of my modules and was told: >>> help('modules') Would do the trick. But I just get Please wait a moment while I gather a list of all available modules... For over 10 minutes before I killed it. Anyone know what could be causing this? Or how I could otherwise see my modules? (System Ubuntu 9.10/Python 2.6.4) Thanks, Dan

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• Do you guys recommend any business magazine? [closed]

  - by kunjaan

  I want to get a birds eye view of the computing industry, read about company profiles, management decisions, new upcoming software companies, learn more about our industry and about the business aspect of my profession. Do you guys read recommend any good business magazines for me to increase my business acumen?

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• Jquery Tabs help with onShow function

  - by StealthRT

  Hey all i am trying to figiure out why my code is not triggering the "onShow" function for the tabs. Here is my code: $(document).ready(function() { $('#tabMain > ul').tabs({ fx: {height: 'toggle'},onShow: function() {alert('onShow');} }); }) I never see the alert box pop up saying "onShow" so i do not know what i am doing wrong? Any help would be awesome! :) David

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• Help me out in writing REGEX

  - by giri

  Hi I like to know how to write REGEX for the following code. <a href="/search?q=user:111111+[apple]" class="post-tag" title="show all posts by this user in 'apple'">Apple</a><span class="item-multiplier">&times;&nbsp;171</span><br> I just need to fetch Apple from the above source code. Can anybody help me out in writing REGEX. Thanks

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• Midi Message need help

  - by Rinaldi

  hello sir.. i need your help Sir.. how to interpret dwParam1 from delegate midiInProc into midi status message like note-off, or note-on, control change.. because as long i try dwParam1 is 254, and is not equal to note-off or else...

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• C# beginner help

  - by ThickBook

  Can you help in this example? I am a beginner. Thanks using System; class Program { public static void Mian(string[] args) { Console.Write("Your Name?: "); string name = Console.Read(); Console.WriteLine("Welcome {0}", name); } }

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• Face recognition Library

  - by Janusz

  I'm looking for a free face recognition library for a university project. I'm not looking for face detection. I'm looking for actual recognition. That means finding images that contain specified faces or libraries that calculate distances between specific faces. I'm using OpenCV for detecting the faces and a rough Eigenfaces Algorithm for the recognition now. But I thought there should be something out there with a better performance then a self written Eigenfaces Algorithm. I don't talk about speed as performance I'm looking for a library with better results as an simple Eigenfaces approach I took a look at faint but it seems the library is not very reusable for my own applications. I'm happy with a library in Python, Java, C++, C or something like that. The best thing would be if it can be run on a Windowsmachine

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• Papers on Software Methodology recommendation

  - by kunjaan

  Please recommend me software engineering/methodology/practices paper. So far I have enjoyed: 1968 Dijkstra : Go To Statement Considered Harmful Reason about correctness about program Nikalus Wirth : Program Development by Stepwise Refinement Not worried about program structure 1971 David Parnas : Information Distribution Aspects of Design Methodology 1972 Liskov : Design Methodology for Reliable Software Systems Extensible Language : Schuman and P Jourrand R. Balzer Structured Programming : Dahl - Hierarchical Program Structures 1971 Jim Morris Protection in Programming Languages 1973 Bill Wulf and Mary Shaw Global Variable Considered Harmful 1974 : Lisko and Zilles ADTs

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• how does data clustering help in image or pattern recognition

  - by anon

  I have been playing around with different data clustering algorithms working on finding clusters between random data points represented an nodes, I keep reading that data clustering is used for image recognition. I am failing to make the connection, how does clustering data help in recognizing an image or in facial recognition. can someone explain this?

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• What is round-robin scheduling?

  - by Benoit

  In a multitasking operating system context, sometimes you hear the term round-robin scheduling. What does it refer to? What other kind of scheduling is there?

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• php security help

  - by Oliver Bayes-Shelton

  Hi, I believe that some one is running shell commands to my server via my site, Could any one offer any help on how the user could be doing this ? also how could I stop this?

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