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• why null pointer exception is not declared as checked exception?

  - by giri

  Hi This was the question asked in interview, null pointer exception is very common why it is not declared as checked exception.I googled but did not get proper answer. Thanks

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• Castle Dynamic Proxy is it possible to intercept value types?

  - by JS Future Software

  Hi, I have a problem and can not find answer and any tip if it is possible to intercept value types in C# by Castle dynamic proxy? I want to intercept IDictionary with INotifyChanged interface. I need this to update view when presenter is changing model. Boxing decimal in object only for making interface is not good idea... maybe somebody have idea how to intrcept value types? Thanks to all answers

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• Word documents generation in web app using Eclipse BIRT Report Engine

  - by Orr151

  Hi, Is it possible to generate word documents (*.doc) in java web application using Eclipse BIRT (Report Engine)? I want .rptdesign to be an input file in generating process. I could not find any example or tutorial. What would you recommend as an alternative solution. As far as I know Jasper Reports allow only RTF format generation. Thank you for your answer/explaination

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• Which languages do not have Global Vars?

  - by HH

  Due to a wave of criticism to use Global Vars in my Java post, I want to use a language without global vars. One suggestion per answer, thank you.

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• What is the state of C99 support in major compilers / toolchains?

  - by pkh

  A response to a comment I made here made me stop and think: "I don't really know what the state of C99 support is." Wikipedia gives details for a few compilers, but I'm not familiar enough with C99 to know all the bits and pieces of the standard, so I'm looking for a gestalt overview answer to the question: What is the state of C99 support in major compilers / toolchains?

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• What are the most useful software development metrics?

  - by kchad

  I would like to track metrics that can be used to improve my team’s software development process, improve time estimates, and detect special case variations that need to be addressed during the project execution. Please limit each answer to a single metric, describe how to use it, and vote up the good answers.

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• How to calculate a measure of a total error in this clustering

  - by Vafello

  I have the following points and clustering of data S1. Can anyone tell me how to calculate the total error associated with this clustering? I know it's not a strictly programming question, but I need it for my algorithm. I think the answer should be 4/3 but I have no idea how to calculate this. Can anyone help me? x1= (2.0,1.0) x2= (2.0,2.0) x3= (1.0,2.0) S1={ x1, x2, x3 }

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• Exposing boost::scoped_ptr in boost::python

  - by Rupert Jones

  Hello, I am getting a compile error, saying that the copy constructor of the scoped_ptr is private with the following code snippet: class a {}; struct s { boost::scoped_ptr<a> p; }; BOOST_PYTHON_MODULE( module ) { class_<s>( "s" ); } This example works with a shared_ptr though. It would be nice, if anyone knows the answer. Thanks

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• What is the 'order' of a perceptron

  - by Martin

  A few simple marks for those who know the answer. I'm doing revision for exams at the moment and one of the past questions is: What is meant by the order of a perceptron? I can't find any information about this in my lecture notes, and even google seems at a loss. My guess is that the order is the number of layers in a neural network, but this doesn't seem quite right.

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• Sparse linear program solver

  - by Jacob

  This great SO answer points to a good sparse solver, but I've got constraints on x (for Ax = b) such that each element in x is >=0 an <=N. The first thing which comes to mind is an LP solver for large sparse matrices. Any ideas/recommendations?

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• hi question about mathematics

  - by davit-datuashvili

  hi i have one question i know site mathoverflow.com and have posted question but unfortunately no one give me answer if i post here can anybody help me? it is not homework because i know somebody will say it is homework what u have tried but this is not so i dont know how solve please if it is possible i will post here ok?

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• iphone flash lite 2.0 support?

  - by cometta

  1.i dont have iphone, so may i know does iphone come with pre-installed flash lite 2.0 or above? if answer is Not, if a web page that embed flash lite app. can it prompt user of iphone to install flash lite easily ? 2. where can i get list of phones that support flash lite 2.0 and above?

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• Comparing set of bits in byte array

  - by Spaniard

  Hello! I have a byte array, as follows: byte[] array = new byte[] { 0xAB, 0x7B, 0xF0, 0xEA, 0x04, 0x2E, 0xF3, 0xA9}; The task is to find the quantity of occurrences '0xA' in it. Could you advise what to do? The answer is 6.

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• Detect network connection type on Android

  - by hgpc

  How do you detect the network connection type on Android? Is it through ConnectivityManager.getActiveNetworkInfo().getType(), and the answer is limited to Wifi and mobile?

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• How to use java.net.URLConnection to fire and handle HTTP requests?

  - by BalusC

  This subject is pretty often asked here and the Sun tutorial is too concise about the subject. So I thought, let's post a CW question and answer about this so that it can if necessary be referenced in other topics. Others are of course free to add more hints and best practices here.

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• Cannot SSH into Amazon EC2 instance

  - by edelwater

  I read: Cannot connect to ec2 instance http://stackoverflow.com/questions/5635640/cannot-ssh-into-amazon-ec2-instance Amazon EC2 instance ssh problems etc... But could not fix it: suddenly (after a year of service, no changes on my winscp settings) it gives me "network error connection timed out" (im using ec2-user) (also from the amazon console). Log FILE: http://pastebin.com/vNq6YQvN All Sites that run on it run fine port 22 is allowed (never changed it) (security group) using the correct ec2-user and domain via my winscp / putty i can connect to other hosting (via ssh) update: SOLVED. I spend 2 days without looking at my own IP address .... (since it did not change the past 3 years....). Your comments made the spark in my brain. thank you so much. (and only now i find dozens of discussions from angry users that the static addresses from my provider are changed to dynamic ones: http://gathering.tweakers.net/forum/list_messages/1501005/12 ...)

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• What should I consider as input and outputs for Lung Cancer Prediction?

  - by aliga

  I've read how brilliant u do answer Artificial *Neural* Networks questions. Mine is what should I consider as input and outputs for Lung Cancer Prediction using Artificial Neural Networks?

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• What MySQL client application would you recommend for Mac OS X?

  - by mlambie

  My colleagues and I are looking for alternative client tools for Mac OS X. I tend to prefer the text-based interface and we have PHPMyAdmin installed on our development servers (Linux). What are your recommendations? (One recommendation per answer please, so people can up-mod individual recommendations).

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• How do I get the Math equation of Python Algorithm?

  - by Gabriel

  ok so I am feeling a little stupid for not knowing this, but a coworker asked so I am asking here: I have written a python algorithm that solves his problem. given x 0 add all numbers together from 1 to x. def fac(x): if x > 0: return x + fac(x - 1) else: return 0 fac(10) 55 first what is this type of equation is this and what is the correct way to get this answer as it is clearly easier using some other method?

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• View Public Key in Domain Key for a Domain

  - by Josh

  Using Jeff's blog post I'm creating domain keys for my account. I wanted to verify the setup using Get or Host command with Bind for Windows but I'm lost one of the commands. I can see view the _domainkey. txt file with this command: host -t txt _domainkey.stackoverflow.com but I'm at a loss at how I'd find the selector record. Jeff points out it can be anything before the before the period in "._domainkey.domain.com" but how would I list all records if I didn't know the exact query name? Is there a wildcard I could use to view all TXT or all records under this section?

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• How do you raise a Java BigInteger to the power of a BigInteger without doing modular arithmetic?

  - by angstrom91

  I'm doing some large integer computing, and I need to raise a BigInteger to the power of another BigInteger. The .pow() method does what I want, but takes an int value as an argument. The .modPow method takes a BigInteger as an argument, but I do not want an answer congruent to the value I'm trying to compute. My BigInteger exponent is too large to be represented as an int, can someone suggest a way to work around this limitation?

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• What can I do to avoid losing original resolution when uploading or exporting photos from Picasa?

  - by Janet Levin

  I'm not a programmer, and/but after multiple email discussions and google searches confirmed the problem I'm describing, and after making changes in picasa preferences with no change in resolution loss (from say, 800kb original image to 235kb after export or upload), I'm at a dead end and thinking the answer may lie among you folks, even though I barely understand the language here.

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• What performance overhead do IoC containers involve?

  - by Sosh

  Hi, Loose coupling is wonderful of course, but I have often wondered what overhead wiring up dynamically using an IoC container (for example Castle Windsor) has over a tightly coupled system? I know that a detailed answer would depend on what the IoC was being used for, but I'm really just trying to get a feel for the magnitude of effort involved in the IoC work. Does anyone have any stats or other resources regarding this? Thanks

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• Multiple SiteMap: entries in robots.txt?

  - by user306942

  I have been searching around using Google but I can't find an answer to this question. A robots.txt file can contain the following line: Sitemap: http://www.mysite.com/sitemapindex.xml but is it possible to specify MULTIPLE sitemap index files in the robots.txt and have the search engines recognize that and crawl ALL of the sitemaps referenced in each sitemap index file? For example, will this work: Sitemap: http://www.mysite.com/sitemapindex1.xml Sitemap: http://www.mysite.com/sitemapindex2.xml Sitemap: http://www.mysite.com/sitemapindex3.xml

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• Which Java version do you mostly (have to) work with?

  - by ferdystschenko

  While from version 5 on, Java provides many extremely useful features like annotations, enums, generics, etc., 1.4 is still in use in many enterprise projects. So I'm wondering what the chances are that you still have to work with 1.4, thus being forced to go without JPA, EJB3 etc. In your answer, please also state the branch of company you work for. Which are the reasons for not switching to Java 5? Thanks, Armin

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