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• Probability Homework Help

  - by Alon

  A child is tasting two types of chocolate. The probability that he will like the first type if he liked the second type is 5/6. The probability that he will like the second type if he liked the first type is 3/8. It is known that the probability that the child won't like the second type of chocolate is doubled than the probability that he won't like the first type. What is the probability that the child like at least one of the two type of chocolates? So I tried: 1-[P(not like the first type AND not like the second type)] which is like: 1-[P(not like the first type)*P(not like first type / not like the second type) + P(not like the second type) which equals: P(not like first type / not like second type) But now, I don't have the data of the conditional probability. In addition, I'd like to see how could it solved using a computer programming language. Any ideas? Thank you.

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• Limit a program's execution time in C (Monte Carlo technique)

  - by rrs90

  I am working on a project which has no determined algorithm to solve using C language. I am Using Monte Carlo technique for solving that problem. And the number of random guesses I want to limit to the execution time specified by the user. This means I want to make full use of the execution time limit defined by the user (as a command line argument) to make as many random iterations as possible. Can I check the execution time elapsed so far for a loop condition. Eg: for(trials=0;execution_time P.S. I am using code blocks 10.05 for coding and GNU compiler.

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• Getting started with Windows Azure

  - by jonhobbs

  Hi All, I'm going to sound like a complete newbie here but here goes... I've just signed up for a Windows Azure account and was hoping to get a simple hello world aspx page up and running in a browser to see how it all works but I can't seem to find a simple guide to getting a very simple web application running. I've got as far as setting up a "service" and going onto the "deploy" page but it's asking me upload an "application package". I've looked on MSDN but there aren't any simple guides, just reams of documentation talking about "roles" and "development fabric". For somebody that is proficient in HTML/CSS and knows a little abit about asp.net it may just as well be in another language. So, does anybody know how to upload a simple aspx page and then access it in a browser? Jon

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• Sharing memory among YACC, Lex, and C files

  - by sczizzo

  I have a YACC (Bison) grammar, a Lex (Flex) tokenizer, and a C program among which I need to share a struct (or really any variable). Currently, I declare the actual object in the grammar file and extern it wherever I need it (which is to say, my C source file), usually using a pointer to manipulate it. I have a shared header (and implementation) file between the C file and the grammar file with functions useful for manipulating my data structure. This works, but it feels a little uncomfortable. Is there a better way to share memory between the grammar and program?

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• COMET with [Session ] TimeOut

  - by Amitd

  hi guys, Just Wondering how [Session] timeouts are(or can be) implemented when using Comet? I'm using Long polling Comet solution and want to implement a kind of Timeout feature. Example : If the user is on a Comet enabled page and doesn't respond to server events/notification for a period of time say 10 mins then invalidate his session and remove his request from server and redirect the user to a timeout page? Will this require Javascript XHR requests to check for a timeout explictly? Using ASP.NET 3.5 / C# (Doesn't need to be language specific) Thanks

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• Shortest Ruby Quine

  - by AaronThomson

  Just finished reading this blog post: http://www.skorks.com/2010/03/an-interview-question-that-prints-out-its-own-source-code-in-ruby/ In it, the author argues the case for using a quine as an interview question. I'm not sure I agree but thats not what this question is about. He goes on to construct a quine in Ruby and refactor it to make it shorter. He then challenges the reader to try to make it even shorter. I played around with it for a while and came up with the following: s="s=;puts s[0,2]+34.chr+s+34.chr+s[2,36]";puts s[0,2]+34.chr+s+34.chr+s[2,36] This is the first time I have ever attempted a quine and I can't figure out how to make it any shorter. What is the shortest Ruby quine you can come up with? Please post an explanation if your implementation requires it.

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• Alternative to Rtmp and red5 for Iphone application

  - by IeN

  I am using red5 + rtmp in client-server flash application. There isnt audio/video streams in my applications, rtmp used for transfering messages from app to server and back. Now i need to develop application for Iphone and need help: 1) is there any rtmp implementation on Iphone ?? 2) If not, how could i solve this problem? Is there is any alternative to rtmp on iphone? And most important question : could it be solved without rewriting whole server part of application? (red5+ rtmp) Thanks

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• Reusable socket

  - by Andrew

  I tryed to create a socket in php and reuse it from other process. I know this can be done with a daemon script but I want to do this without. I created a socket and binded it to a specific port. $sock = socket_create (AF_INET, SOCK_STREAM, SOL_TCP); socket_set_option ($sock, SOL_SOCKET, SO_REUSEADDR, 1); socket_bind ($sock, 'xx.xx.xx.xx', 10000); socket_connect ($sock, $host, $port); And from another php file I did the same thing. But the packets that I send from the 2 file are not "validated" by host. I sniffed all ports and I see that it uses same local and destination port. I don't understand where is the problem. Can you help me with this? It's ok in any other programming language, or any other solution for this. Andrew

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• Looking for evolutionary music example code

  - by Dan Dyer

  I would like to implement an interactive evolutionary algorithm for generating music (probably just simple melodies to start with). I'd like to use JFugue for this. Its website claims that it is well-suited to evolutionary music, but I can't find any evolutionary examples. I already have a framework to provide the evolutonary machinery. What I am looking for is some simple, working code that demonstrates viable approaches for the musical part (e.g. suitable encodings and evolutionary operators for the evolved tunes). I have some ideas how it might be achieved, but I'm not particularly knowledgeable about music theory, so to start with I'd like to just reimplement something that is known to work. So does anybody have, or know of, any freely available code (any language is fine) that demonstrates one or more approaches to evolutionary music? EDIT: I'm specifically looking for evolutionary code rather than other techniques that could be used for music synthesis.

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• How to incorporate WebSockets into a Cocoa application

  - by robw

  I am developing a Cocoa application which involves a chat element. One approach I've considered is using Websockets to handle client-server communication. This would be particularly desirable because chats will also be displayed on a website, and using Websockets could make the implementation very simple. So: would it be possible to use a WebView element, and use Websockets within it? (I know Safari doesn't support Websockets yet, so I imagine this is not possible?) Failing that, are there any Websocket client libraries for C, Objective C, or any other language I could successfully embed within my application? Suggestions welcomed.

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• i18n with webpy

  - by translation..

  Hello, i Have a problem with i18n, using webpy. I have followed this : http://webpy.org/cookbook/i18n_support_in_template_file So, in my .wsgi there is : #i18n gettext.install('messages',I18N_PATH,unicode=True) gettext.translation('messages',I18N_PATH,languages=['fr_FR','en_US']).install(True) So i ran : pygettext.py -a -v -d messages -o i18n/messages.po controllers/*.py views/*.html I have copied and translated messages.po, I have also change the "content-type" and the "content-transfer-encoding: "Content-Type: text/plain; charset=utf-8\n" "Content-Transfer-Encoding: UTF-8\n" And i ran this command: msgfmt -v -o i18n/fr_FR/LC_MESSAGES/messages.mo i18n/fr_FR/LC_MESSAGES/messages.po >>>93 messages traduits. here is the arborescence of i18n folder: i18n/: en_US fr_FR messages.po i18n/en_US: LC_MESSAGES i18n/en_US/LC_MESSAGES: messages.mo messages.po i18n/fr_FR: LC_MESSAGES i18n/fr_FR/LC_MESSAGES: messages.mo messages.po But when i go in my website (my browser's language is "fr_fr"), i haven't the string translated. And I don't know why. Anyone has an idea? Thanks

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• newbie question -- how does one override show for a newtype?

  - by gatoatigrado

  I want to override the default integer constructors in Haskell so they produce strings (mostly for curiosity, but temporarily to make a nice input alternative for LaTeX's \frac{}{} inconvenience). I wanted to be able to use the language itself, instead of a special parser, but I guess that's probably not going to work out... module Main where import Prelude hiding ((+)) newtype A = A Int deriving (Eq, Show, Num) default (A) (+) :: A -> (A -> String) (A a) + (A b) = (show a) ++ " + " ++ (show b) main2 = 3+4 main :: IO () main = putStrLn main2 The problem with the above is that the + function only works for (A, A) instead of (A, String), etc. If one simply leaves out the pattern match "(A a)" and writes "a" instead, then the show() function prepends "A " so "3" becomes "A 3" instead of just "3". I want to override Show for A, but it seems to be quite a headache...

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• Stack overflow in OCaml and F# but not in Haskell

  - by Fernand Pajot

  I've been comparing for fun different languages for speed in execution of the following program: for i from 1 to 1000000 sum the product i*(sqrt i) One of my implementations (not the only one) is constructing a list [1..1000000] and then folding with a specific funtion. The program works fine and fast in Haskell (even when using foldl and not foldl') but stack overflows in OCaml and F#. Here is the Haskell code: test = foldl (\ a b -> a + b * (sqrt b)) 0 create 0 = [] create n = n:(create (n-1)) main = print (test (create 1000000)) And here is the OCaml one: let test = List.fold_left (fun a b -> a +. (float_of_int b) *. (sqrt (float_of_int b))) 0. ;; let rec create = function | 0 -> [] | n -> n::(create (n-1)) ;; print_float (test (create 1000000));; Why does the OCaml/F# implementation stack overflows?

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• How can I differentiate between smart phones and others?

  - by Denis Hoctor

  Hi all, I'm looking to revamp our mobile site with something simple for phones below the ambiguous smart phone category and something a little more interesting for the phones above this category. I'm not interested in WAP/WML for this project. I'm building a ASP.Net 4 MCV 2 app and using MBDF What I'd like to know is how best to define this differentiation when using MBDF? Screen size, Javascript, SpportsTouchScreen etc. are all in MBDF along with others but I'm not sure where to draw the line and where the data is most accurate for the broad number of devices. What do those of you out there developing for this spread of hardware & software split on? Thanks, Denis P.S. I've done my research on xHTML MP1.0 - 1.2 and the best practises for implementation to ensure broad coverage but I don't want to restrict the newer phones out there to what the base line can see.

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• Python and Postgresql

  - by Ian

  Hi all, if you wanted to manipulate the data in a table in a postgresql database using some python (maybe running a little analysis on the result set using scipy) and then wanted to export that data back into another table in the same database, how would you go about the implementation? Is the only/best way to do this to simply run the query, have python store it in an array, manipulate the array in python and then run another sql statement to output to the database? I'm really just asking, is there a more efficient way to deal with the data? Thanks, Ian

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• Using AesCryptoServiceProvider in VB.NET

  - by Collegeman

  My problem is actually a bit more complicated than just how to use AES in VB.NET, since what I'm really trying to do is use AES in VB.NET from within a Java application across JACOB. But for now, what I need to focus on is the AES implementation itself. Here's my encryption code Public Function EncryptAES(ByVal toEncrypt As String, ByVal key As String) As Byte() Dim keyArray = Convert.FromBase64String(key) Dim toEncryptArray = Encoding.Unicode.GetBytes(toEncrypt) Dim aes = New AesCryptoServiceProvider aes.Key = keyArray aes.Mode = CipherMode.ECB aes.Padding = PaddingMode.ISO10126 Dim encryptor = aes.CreateEncryptor() Dim encrypted = encryptor.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length) aes.Clear() Return encrypted End Function Once back in the Java code, I turn the byte array into a hexadecimal String. Now, to reverse the process, here's my decryption code Public Function DecryptAES(ByVal toDecrypt As String, ByVal key As String) As Byte() Dim keyArray = Convert.FromBase64String(key) Dim toDecryptArray = Convert.FromBase64String(toDecrypt) Dim aes = New AesCryptoServiceProvider aes.Key = keyArray aes.Mode = CipherMode.ECB aes.Padding = PaddingMode.ISO10126 Dim decryptor = aes.CreateDecryptor() Dim decrypted = decryptor.TransformFinalBlock(toDecryptArray, 0, toDecryptArray.Length) aes.Clear() Return decrypted End Function When I run the decryption code, I get the following error message Padding is invalid and cannot be removed.

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• is it legal/ethical to use source code provided in academic papers, or talks given at trade events l

  - by lucid

  so, is it legal to use source code from papers and such: like this paper on perlin noise: [url]http://mrl.nyu.edu/~perlin/paper445.pdf[/url] links to this source code: [url]http://mrl.nyu.edu/~perlin/noise/[/url] and stam's famous talk on fluid dynamics, includes source code throughout, annotated with instructions like "add these macros to the beginning of your code" [url]http://www.dgp.toronto.edu/people/stam/reality/Research/pdf/GDC03.pdf[/url] I'm just not sure if it's legal to copy and paste this to use in your own commercial code. if I were to make my own implementation, it would end up being close to identical, since I'd probably use the source code as a reference. I know very little about copyright law, including how it applies in these situations, and I can never find usage and licensing terms for these. Nor did googling any terms I could think of provide me the specific answer I need. does anyone know for sure what the rules/laws are here, or where I can find the answer?

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• Flex - How to call a webservice without crossdomain.xml file

  - by Stephane Grenier

  How can I consume a webservice that hasn't explicitely created a crossdomain.xml? I understand it's for security and to prevent cross-site scripting, but it does seem like a major limitation to the Flex framework. For example, if I want to consume a webservice, which is suppose to be language agnostic, then I can't with Flex. The webservice/server has to be specifically prepared for Flex/Flash. If it's not, then it cannot be consumed. That can't be right can it?

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• Java Interface Usage Guidelines -- Are getters and setters in an interface bad?

  - by user68759

  What do people think of the best guidelines to use in an interface? What should and shouldn't go into an interface? I've heard people say that, as a general rule, an interface must only define behavior and not state. Does this mean that an interface shouldn't contain getters and setters? My opinion: Maybe not so for setters, but sometimes I think that getters are valid to be placed in an interface. This is merely to enforce the implementation classes to implement those getters and so to indicate that the clients are able to call those getters to check on something, for example.

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• Clob as param for PL/SQL Java Stored Procedure

  - by JDS

  I have a java stored procedure that takes in a clob representing a chunk of javascript and mins it. The structure of the function calling the JSP is as follows: function MIN_JS(pcl_js in clob) return clob as language java name 'JSMin.min(oracle.sql.CLOB) return oracle.sql.CLOB'; In the actual JSP, I have the following: import oracle.sql.CLOB; public class JSMin { ... public static min(CLOB js) { ... } The problem I'm having is that whenever I pass a clob to JS_MIN, it is always interpreted as null inside the JSP. I've checked the clob before calling JS_MIN annd it definitely has contents. Any ideas as to what I'm missing? Any help is greatly appreciated.

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• How do I change the background color of the column with the expanders in Eclipse?

  - by Pridkett

  Recently after scorching my retinas from the garish white background in Eclipse, I found some of the excellent posts about how to change the colors so it uses sane (i.e. dark background) colors in the editor. However, one problem present in all solutions is that background of the column with the expanders for code folding is always white. Is there a way to change the background of that column? Here's a screenshot of the problem: I'm not the only person that has this problem, as shown in the screenshots for the following questions: Dark Color Scheme for Eclipse Color Themes for Eclipse (application of color schemes results in this issue on a Mac, no idea about PC) I know that the problem is not language specific as it happens in Java, Python, HTML, and everything else. Any hints on where in the pages of preferences this setting is?

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• JavaScript "Cannot retrieve referenced URL"

  - by jb

  I have JavaScript inside a .wsf file and I'm getting the error: C:\bin\LDLSInfo.wsf(53, 34) Windows Script Host: Cannot retrieve referenced URL: S:\tools\JScript\lib\StandardWSH.js At line 53, it says <script language="JScript" src="S:\tools\JScript\lib\StandardWSH.js"/> I know that LDLSInfo.wsf (the main script) and StandardWSH.js (the script to load) both work fine, because I've ran them from a different machine. It works fine on one machine and not on the other, both are Windows 7 x64 computers. So I'm thinking I'm missing some .dll's. Thanks for the help, -jb

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• Including two signatures, both with a 'type t' [Standard ML]

  - by Andy Morris

  A contrived example: signature A = sig type t val x: t end signature B = sig type t val y: t end signature C = sig include A B end Obviously, this will cause complaints that type t occurs twice in C. But is there any way to express that I want the two ts to be equated, ending up with: signature C = sig type t val x: t val y: t end I tried all sorts of silly syntax like include B where type t = A.t, which unsurprisingly didn't work. Is there something I've forgotten to try? Also, I know that this would be simply answered by checking the language's syntax for anything obvious (or a lack of), but I couldn't find a complete grammar anywhere on the internet. (FWIW, the actual reason I'm trying to do this is Haskell-style monads and such, where a MonadPlus is just a mix of a Monad and an Alternative; at the moment I'm just repeating the contents of ALTERNATIVE in MONAD_PLUS, which strikes me as less than ideal.)

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• is magento overkill for a one-man webshop?

  - by Rick J

  I have been looking at magento for a while and I think I have a decent handle on how to use/customize it. I have a client that wants a webshop , this is just a small business that sells a few products and just supports one language. I was wondering if using magento will be an overkill for a simple webshop , in case I cant help them to make future changes tp the webshop, the people running their business might have to do it. But it looks like magento is made for people with some technical know how (lots of xml editing etc).. So should i go for magento or a simpler solution like osCommerce or maybe even a simple custom solution. Would like to hear your opinions!

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• Most mind-blowing C++ hack you've ever seen?

  - by sblom

  In the same spirit as the "Hidden features of X?" series, what are the most mind-blowingly well-executed "I didn't even think the language could do that!" hacks that you've ever seen in C++. For example, my recent favorite is an implementation of the "operator" --> for pre-C++0x lambdas. Another fantastic example is Multi-dimensional analog literals. (Note: this is a community wiki question to avoid the appearance of reputation-whoring.)

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