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• Function Composition in Haskell

  - by Watts

  I have a function that takes 3 functions and switches the types and combine to make a new function. For example a test case call would be : (chain init tail reverse ) "Haskell!" the output should be lleksa I've tried to do this problem a few different ways including using the map function but I kept getting association problems. so i did chain :: Ord a => [a] -> a chain f g h x = f.g.h$x my error is Couldn't match expected type[t0->t1->t2->a0] When I type the problem directly into prelude like replacing f, g, h, x with the values it comes out right Is there even a way to do three functions, I've only seen two in examples

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• Similar code detector

  - by Let_Me_Be

  I'm search for a tool that could compare source codes for similarity. We have a very trivial system right now that has huge amount of false positives and the real positives can easily get buried in them. My requirements are: reasonably small amount of false positives good detection rate (yeah these are going against each other) ideally with a more complex output than just a single value usable for C (C99) and C++ (C++03 and optimally C++11) still maintained usable for comparing two source files against each other usable in non-interactive mode EDIT: To avoid confusion, the following two code snippets are identical and should be detected as such: for (int i = 0; i < 10; i++) { bla; } int i; while (i < 10) { bla; i++; } The same here: int x = 10; y = x + 5; int a = 10; y = a + 5;

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• How can I (reasonably) precisely perform an action every N milliseconds?

  - by Jon Cage

  I have a machine which uses an NTP client to sync up to internet time so it's system clock should be fairly accurate. I've got an application which I'm developing which logs data in real time, processes it and then passes it on. What I'd like to do now is output that data every N milliseconds aligned with the system clock. So for example if I wanted to do 20ms intervals, my oututs ought to be something like this: 13:15:05:0000 13:15:05:0020 13:15:05:0040 13:15:05:0060 I've seen suggestions for using the stopwatch class, but that only measures time spans as opposed to looking for specific time stamps. The code to do this is running in it's own thread, so should be a problem if I need to do some relatively blocking calls. Any suggestions on how to achieve this to a reasonable (close to or better than 1ms precision would be nice) would be very gratefully received.

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• Does '[ab]+' equal '(a|b)+' in python re module?

  - by user1477871

  I think pat1 = '[ab]' and pat2 = 'a|b' have the same function in Python(python2.7, windows) 're' module as a regular expression pattern. But I am confused with '[ab]+' and '(a|b)+', do they have the same function, if not plz explain details. ''' Created on 2012-9-4 @author: melo ''' import re pat1 = '(a|b)+' pat2 = '[ab]+' text = '22ababbbaa33aaa44b55bb66abaa77babab88' m1 = re.search(pat1, text) m2 = re.search(pat2, text) print 'search with pat1:', m1.group() print 'search with pat2:', m2.group() m11 = re.split(pat1, text) m22 = re.split(pat2, text) print 'split with pat1:', m11 print 'split with pat2:', m22 m111 = re.findall(pat1, text) m222 = re.findall(pat2, text) print 'findall with pat1:', m111 print 'findall with pat2:', m222 output as below: search with pat1: ababbbaa search with pat2: ababbbaa split with pat1: ['22', 'a', '33', 'a', '44', 'b', '55', 'b', '66', 'a', '77', 'b', '88'] split with pat2: ['22', '33', '44', '55', '66', '77', '88'] findall with pat1: ['a', 'a', 'b', 'b', 'a', 'b'] findall with pat2: ['ababbbaa', 'aaa', 'b', 'bb', 'abaa', 'babab'] why are 'pat1' and 'pat2' different and what's their difference? what kind of strings can 'pat1' actually match?

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• Can a parser tell the lexer to ignore a newline?

  - by chollida

  I'm writing a preprocessor for my language. In the preprocessor I've output a line that wasn't in the source file. This causes any error messages that Anltr creates to be incremented by one line. The Lexer handles the line count so I'm wondering if there is a way for the parser to tell the lexer to decrement the line count, or to ignore a specific newline. I'm also open to other suggestions on how to work around this. The only constraint I have is putting the extra line inline with the existing code. I'd prefer to keep it on it's own line to keep my parsing sane.

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• Rails: saving a string on an object -- syntax problem?

  - by Veep

  Hey there, I am trying to write a simple function to clean a filename string and update the object. When I save a test string it works, but when I try to save the string variable I've created, nothing happens. But when I return the string, the output seems to be correct! What am I missing? def clean_filename clean_name = filename clean_name.gsub! /^.*(\\|\/)/, '' clean_name.gsub! /[^A-Za-z0-9\.\-]/, '_' clean_name.gsub!(/\_+/, ' ') #update_attribute(:filename, "test") #<-- correctly sets filename to test #update_attribute(:filename, clean_name) #<-- no effect????? WTF #return clean_name <-- seems to returns the correct string end Thank you very much.

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• Limited recursion in C?

  - by function

  I ran this program and it output ... 65088 65089 65090 and then it stopped. Windows 7 said a.exe stopped working. Here is the code: #include <stdio.h> void go(void); main() { go(); } void go(void) { static int i = 0; printf("%d\n", i++); go(); } I think this program should keep on printing numbers indefinitely due to recursion, but it stops at 65090! The C code is compiled with gcc. Any ideas?

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• Concatenation awk outputs

  - by Rookie_22

  I'm using regex to parse NMAP output. I want the ip addresses which are up with the corresponding ports open. Now I've a very naive method of doing that: awk '/^Scanning .....................ports]/ {print substr ($2,1,15);}' results.txt awk '/^[0-9][0-9]/ {print substr($1,1,4);}' results.txt | awk -f awkcode.awk where awkcode.awk contains the code to extract numbers out of the substring. The first line prints all the ips that are up and 2nd gives me the ports. My problem is that I want them mapped to each other. Is there any way to do that? Even sed script would do.

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• Nesting if else statements in PHP to validate a URL

  - by John

  I'm currently writing up a function in order to validate a URL by exploding it into different parts and matching those parts with strings I've defined. This is the function I'm using so far: function validTnet($tnet_url) { $tnet_2 = "defined2"; $tnet_3 = "defined3"; $tnet_5 = "defined5"; $tnet_7 = ""; if($exp_url[2] == $tnet_2) { #show true, proceed to next validation if($exp_url[3] == $tnet_3) { #true, and next if($exp_url[5] == $tnet_5) { #true, and last if($exp_url[7] == $tnet_7) { #true, valid } } } } else { echo "failed on tnet_2"; } } For some reason I'm unable to think of the way to code (or search for the proper term) of how to break out of the if statements that are nested. What I would like to do check each part of the URL, starting with $tnet_2, and if it fails one of the checks ($tnet_2, $tnet_3, $tnet_5 or $tnet_7), output that it fails, and break out of the if statement. Is there an easy way to accomplish this using some of the code I have already?

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• python's `with` statement

  - by Prestel Nué

  Hi there, seems like I do not understand something with---the python with statement. Consider this class: class test(object): def __enter__(self): pass def __exit__(self, *ignored): pass now, when using it with with, like in with test() as michael: print repr(michael) I would expect some output like <test instance at memore blah>. But I get None. Something wrong here? Any suggestions would help. (I am using Python 2.6.6.) EDIT: Thanks to ephement for pointing me to the documentation. The __enter__ method should read def __enter__(self): return self

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• PHP: Using a variable that are inside a function.

  - by Karem

  I have: include ('functions.php'); check_blocked(); echo $blocked; in functions.php, check_blocked(); exists. Inside check_blocked I got: global $blocked; $blocked = '1234'; I want to echo $blocked variable, that are inside check_blocked(). It doesnt work, no output.. This is an example of my original problem, so please dont say that I could just have the echo inside the function, as I cannot have in my original code.

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• InvalidCastException: System.Web.UI.PartialCachingControl -> MyCustomControl when OutputCaching

  - by marcinn

  The problem: I am unable to use OutputCaching with my controls which derives from MyCustomControl. Controls are loaded dynamically using definitions from database with Page.LoadControl method. When I add to ascx <%@ OutputCache VaryByParam="*" Duration="3600"% the "InvalidCastException: System.Web.UI.PartialCachingControl - MyCustomControl" exception is thrown. I am unable to modify assembly witch contains dynamic loading controls logic. Is there any way to fix it in derived controls? The second question is about iis7 and native output caching - is it resolves this problem? (I tried to set up several performance counters and I saw that cache wasn't hit...)

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• Recording app sound in iphone

  - by user292127

  Hi, I am developing a music mixing app in iphone. It'll mix the music and user can compose a new music from it. I need to record this final music. I had used AVAudiorecorder to record this one. But no change. It can record sound from microphone but I need to record app sound. I had used audio queue call back function to record the audio. But when app runs I can hear the audio from my app and I couldn't hear any sound from recorded audio. There is no problem with recording since I can hear the audio recorded through microphone. But I need an offline recorder which can record the audio output of iphone, rather than the audio input through microphone. I need a recorder which can record audio using ipod touch (no microphone). Any help?

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• Is this a valid C statement ?

  - by Philando Gullible

  Lets say I write char c[99] = {'Stack Overflow'}; in C or C++ it does compiles fine but does this valid? By valid I meant not invoking any kind of undefined or unspecified behavior. Again if I write char c[99] = 'Stack Overflow'; gcc complains about multicharacter constant which is obvious but in the above when I am enclosing within curly brackets compiler is happy! why is it so ? I also notice that puts(c); after the first statement will output 'w' precisely the last character of a general string in-place of Stack Overflow. why so ? Could somebody explain this behavior may be separately.

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• how to force drupal function to not use DB cache?

  - by Alaa

  Hi All, i have a module and i am using node_load(array('nid' = arg(1))); now the problem is that this function keep getting its data for node_load from DB cache. how can i force this function to not use DB cache? Example my link is http://mydomain.com/node/344983 now: $node=node_load(array('nid'=arg(1)),null,true); echo $node-nid; output 435632 which is a randomly node id (available on the system) and everytime i ctrl+F5 my browser i get new nid!! Thanks for your help

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• How does this code block works?

  - by Justin John

  I can't understand how the following code works. $start = 1; while($start<10){ if ($start&1) { echo "ODD ".$start." <br/> "; } else { echo "EVEN ".$start." <br/> "; } $start++; } The $start&1 will return ODD and EVEN seperately. Output ODD 1 EVEN 2 ODD 3 EVEN 4 ODD 5 EVEN 6 ODD 7 EVEN 8 ODD 9 If we give $start&2 instead of $start&1, it returns with another order. How &1 &2 etc... works here?

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• Read video information(date created)?

  - by Lynx

  In window, i can get the date created of the video from properties(right click). I have a few idea on this but i dont know how to do it. 1. Get the video information directly from video(like in windows), 2. By extracting the video name to get the date created(The video's name is in date format, which is the time it created). And i also using taglib-sharp to get the video duration and resolution, but i cant find any sample code on how to get the video creation date. Note: video name in date format - example, 20121119_125550.avi Edit Found this code and so far its working string fileName = Server.MapPath("//video//20121119_125550.avi"); FileInfo fileInfo = new FileInfo(fileName); DateTime creationTime = fileInfo.CreationTime; Output: 2012/11/19 12:55:50 For the file's name, i will add another string in name. For example User1-20121119_125550.avi.avi, so it will get complicated after that.

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• communicate with a process in utf-8 on a cp1252 consoless

  - by Mapad

  I need to control a program by sending commands in utf-8 encoding to its standard input. For this I run the program using subprocess.Popen(): proc = Popen("myexecutable.exe", shell=True, stdin=PIPE, stdout=PIPE, stderr=PIPE) proc.stdin.write(u'ééé'.encode('utf_8')) If I run this from a cygwin utf-8 console, it works. If I run it from a windows console (encoding ='cp1252') this doesn't work. Is there a way to make this work without having to install a cygwin utf-8 console on each computer I want it to run from ? (NB: I don't need to output anything to console)

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• jQuery accordion expanded

  - by hajder

  I am trying to create an accordion with jQuery from this example http://docs.jquery.com/UI/Accordion The markup is the same, i.e. <div id="accordion"> <h3><a href="#">First header</a></h3> <div>First content</div> <h3><a href="#">Second header</a></h3> <div>Second content</div> </div> And I have script file enqueued correctly, which has the following content: $ = jQuery; $(document).ready(function() { $("#accordion").accordion(); }); But I get this error in the console output TypeError: 'undefined' is not a function (evaluating '$("#accordion").accordion()') The result being all divs are expanded, i.e not clickable.

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• Why does this C++ char array seem to be able to hold more than its size?

  - by Phenom

  #include <iostream> using namespace std; typedef struct { char streetName[5]; } RECORD; int main() { RECORD r; cin >> r.streetName; cout << r.streetName << endl; } When I run this program, if I enter in more than 5 characters, the output will show the whole string I entered. It does not truncate at 5 characters. Why is that? How can I get this to work correctly?

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• Encoding regarding Term::Size

  - by sid_com

  Hello! The Term::Size-module jumbles up the encoding. How can I fix this? #!/usr/bin/env perl use warnings; use strict; use 5.010; use utf8; binmode STDOUT, ':encoding(UTF-8)'; use Term::Size; my $string = 'Hällö'; say $string; my $columns = ( Term::Size::chars *STDOUT{IO} )[0]; say $columns; say $string; Output: Hällö 140 H?ll?

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• A better way of representing File Attachment into a list(c#3.0)

  - by Newbie

  I have written List<Attachment> lstAttachment = new List<Attachment>(); //Check if any error file is present in which case it needs to be send if (new FileInfo(Path.Combine(errorFolder, errorFileName)).Exists) { Attachment unprocessedFile = new Attachment(Path.Combine(errorFolder, errorFileName)); lstAttachment.Add(unprocessedFile); } //Check if any processed file is present in which case it needs to be send if (new FileInfo(Path.Combine(outputFolder, outputFileName)).Exists) { Attachment processedFile = new Attachment(Path.Combine(outputFolder, outputFileName)); lstAttachment.Add(processedFile); } Working fine and is giving the expected output. Basically I am attaching the file to the list based on whether the file is present or not. I am looking for any other elegant solution than the one I have written. Reason: Want to learn differnt ways of representing the same program. I am using C#3.0 Thanks.

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• Get machine name for remote computer on local network

  - by durza

  Hi, I've 2 machines with names Comp1, Comp2. There is a DNS name for them, that mask them as one, let say DNSName. I get IP addresses for both machines via Dns.GetHostEntry("DNSName"). But when I try get Dns.GetHostEntry(ipAddress) entry.HostName always contains DNSName. I found some way to get name through WMI. But our policy doesn't allow WMI on remote machines. I can do parsing of nbstat -a output, but I would like to do some clean aproach to this. Is there some way?

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• Why does using set -e cause my script to fail when called in crontab

  - by SDGuero

  I have a bash script that performs several file operations. When any user runs this script, it executes successfully and outputs a few lines of text but when I try to cron it there are problems. It seems to run (I see an entry in cron log showing it was kicked off) but nothing happens, it doesn't output anything and doesn't do any of its file operations. It also doesn't appear in the running processes anywhere so it appears to be exiting out immediately. After some troubleshooting I found that removing "set -e" resolved the issue, it now runs from the system cron without a problem. So it works, but I'd rather have set -e enabled so the script exits if there is an error. Does anyone know why "set -e" is causing my script to exit? Thanks for the help, Ryan

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• Is possible to remove an event listener in actionscript 3 (flash) ??

  - by DomingoSL

  In the frame 1 of my movie, part of my code is: stage.addEventListener(Event.RESIZE, resizeHandler); It works all fine, but when i go to the frame 2 the listener is still there but the function resizeHandler is not anymore (and i dont want it). So the console output this: TypeError: Error #1009: Cannot access a property or method of a null object reference. at index_fla::MainTimeline/resizeHandler() at flash.events::EventDispatcher/dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at flash.display::Stage/dispatchEvent() at index_fla::MainTimeline/frame2() Is possible to remove the event listener on the frame 2? Thanks!!!

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