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  • Best Fit Scheduling Algorithim

    - by Teegijee
    I'm writing a scheduling program with a difficult programming problem. There are several events, each with multiple meeting times. I need to find an arrangement of meeting times such that each schedule contains any given event exactly once, using one of each event's multiple meeting times. Obviously I could use brute force, but that's rarely the best solution. I'm guessing this is a relatively basic computer science problem, which I'll learn about once I am able to start taking computer science classes. In the meantime, I'd prefer any links where I could read up on this, or even just a name I could Google.

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  • developing iphone apps on windows is it worth the hassel

    - by kalpaitch
    I'm only after a simple solution and won't be developing anything particularly complex. But I'm wondering whether the hassals of developing an iPhone app NOT on MacOS are really that significant to avoid giving it a shot. Bearing in mind that I do have access to a mac every now and again. So I would be able to compile it using the official Apple supported SDK, but I just want to be able to develop it in my own environment (windows laptop). I heard someone mention a while ago that there are various objective C compilers that allow writing code in various other web technologies as well. Are these really valid. And am I alone in thinking Apple's whole attitude towards this is totally imoral. Charging $200 for the privelege of having your app unequivocally rejected etc etc and then not being allowed to look directly at Steve Jobs or his golden retrievers.

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  • Bibtex with no references title

    - by Bryan Ward
    I am working on writing a scientific poster in LaTeX, and I want to include a few references for my work. Because this is a poster, I have my own customized headers for different sections, and don't want my related works to have a separate title. Essentially I have something like this: \begin{textblock}{5.5}(19.5,11) \CHead{Related Work} %a newcommand header I wrote \bibliographystyle{acm} \bibliography{mybib} \end{textblock} And it comes out with a header called "Related Work" like I want, but it also under that says "References", which I don't want. I found a few websites that said that I could override this with something like \renewcommand\refname{} But all this does is take the word "References" out, but the space allotted for the title is still there. Is there a way to completely eliminate the title and any space it may take up?

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  • To find first N prime numbers in python

    - by Rahul Tripathi
    Hi All, I am new to the programming world. I was just writing this code in python to generate N prime numbers. User should input the value for N which is the total number of prime numbers to print out. I have written this code but it doesn't throw the desired output. Instead it prints the prime numbers till the Nth number. For eg.: User enters the value of N = 7. Desired output: 2, 3, 5, 7, 11, 13, 19 Actual output: 2, 3, 5, 7 Kindly advise. i=1 x = int(input("Enter the number:")) for k in range (1, (x+1), 1): c=0 for j in range (1, (i+1), 1): a = i%j if (a==0): c = c+1 if (c==2): print (i) else: k = k-1 i=i+1

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  • NSRangeException Issue

    - by Garry
    Hi, I am writing a Core Data-based iPhone app and I am new to Objective-C. I have a bug that I am really struggling to nail. The iPhone simulator keeps crashing with the following error message: 2010-03-21 17:37:40.583 Patients[3689:207] * Terminating app due to uncaught exception 'NSRangeException', reason: '* -[NSCFArray insertObject:atIndex:]: index (1) beyond bounds (1)' 2010-03-21 17:37:40.585 Patients[3689:207] Stack: ( 31007835, 2516698377, 31091771, 31091610, 601273, 197333, 3194546, 3141378, 25020, 29768673, 214570, 30740485, 204512, 29114749, 29505379, 29001194, 29252410, 29190487, 30794322, 30791263, 30788680, 39097877, 39098074, 2883503, 9912, 9766 ) This error happens when I press return on a textField. What happens when the return key is pressed is that an attribute on an entity is updated. I don't know what array is out of bounds as I am not using any arrays in my code! Is there any way of getting more detail as to where in my code the error is?? Thanks,

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  • Running Perl Scripts on servers that don't have the modules

    - by envinyater
    I need to run a perl script to gather system information that will be deployed and executed on different unix servers. Right now I am writing it and testing it, and I'm receiving this error. Can't locate XML/DOM.pm in @INC (@INC contains: /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5 .) at test.pl line 7. BEGIN failed--compilation aborted at test.pl line 7. So I am simply using XML::DOM which should be part of Perl but it isn't for this version on this particular server which is 5.10.1. Anyways, is there a way I can create and design my script and package modules into it while keeping the .pl extension, which is the requirement for this script?

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  • Socket Communication in C#- IP-Port

    - by Ahmet Altun
    I am testing my socket programs at home, in local network. Server and client programs are running on seperate machines. Server program socket is binded as: serverSocket.Bind(new IPEndPoint(IPAddress.Parse("127.0.0.1"), 8999)); Client program (on the other computer) is connected as: clientSocket.Connect(IPAddress.Parse("192.168.2.3"), 8999); Why can Client not communicate with server? Do I need to make some firewall configuration or something like that? Or am I writing Server Ip incorrectly to the Client? (I got it from cmd-ipconfig of server)

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  • Is there good .sol editor for Flash Player 9 Local Shared Objects? Can we build one?

    - by nerdabilly
    There's plenty of them out there but none of them do what I would like them to do. Most of them crash when opening a file or simply corrupt the data. Many don't run at all. It seems to me that most were written 3-4 years ago for AS2 .sols and no longer work with FP9/AS3 sols. I'd attempt to write my own using AIR but I can't find a new spec of the byte format. There's an explanation of the file format here: http://sourceforge.net/docman/display_doc.php?docid=27026&group_id=131628 and another here: http://sourceforge.net/docman/display_doc.php?docid=27026&group_id=131628 but it looks as though both of these docs are a good 4 years old (pre-FP9) and as I'm not skilled or experienced in file formats, writing a new one, especially without an updated spec, is seeming like less and less of a viable option. Ideally I'd like one that can not only read the .sol, but edit and save new values also. Thanks!

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  • C++/CLI .ToString() returning error

    - by George Johnston
    I am a beginner to C++/CLI as I come from a C# background. I am currently writing a wrapper for some native C++ code. I have the following methods: void AddToBlockList(System::String^ address) { char* cAddress = (char*)(void*)Marshal::StringToHGlobalAnsi(address); _packetFilter->AddToBlockList(cAddress); } void AddToBlockList(IPAddress^ address) { char* cAddress = (char*)(void*)Marshal::StringToHGlobalAnsi(address.ToString()); _packetFilter->AddToBlockList(cAddress); } ...The first method works fine and converts my string into the character array. However, the second function with the IPAddress object as the signiture gives me the following error: error C2228: left of '.ToString' must have class/struct/union ...When I type ? address.ToString() ...in the command window, the IP Address prints. Not sure where I'm going wrong. Any ideas?

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  • C# Lambda Expression Speed

    - by Nathan
    I have not used many lambda expressions before and I ran into a case where I thought I could make slick use of one. I have a custom list of ~19,000 records and I need to find out if a record exists or not in the list so instead of writing a bunch of loops or using linq to go through the list I decided to try this: for (int i = MinX; i <= MaxX; ++i) { tempY = MinY; while (tempY <= MaxY) { bool exists = myList.Exists(item => item.XCoord == i && item.YCoord == tempY); ++tempY; } } Only problem is it take ~9 - 11 seconds to execute. Am I doing something wrong is this just a case of where I shouldn't be using an expression like this? Thanks.

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  • Is there any way to use getaddrinfo() and freeaddrinfo() and still be the program compatible with le

    - by Sam C.
    Hi, in the Winsock2 library getaddrinfo() and freeaddrinfo() was only added in Windows XP and on. I know how to replace them in legacy systems, but a conditional use depending on the Windows version won't help. The application won't start in 9x with a message saying that it was linked to a missing export in WS2_32.dll. I'm using MinGW to compile and link the code and would like to keep using it. Maybe writing those functions by myself? Thank you very much for everything.

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  • Django QuerySet filter + order_by + limit

    - by handsofaten
    So I have a Django app that processes test results, and I'm trying to find the median score for a certain assessment. I would think that this would work: e = Exam.objects.all() total = e.count() median = int(round(total / 2)) median_exam = Exam.objects.filter(assessment=assessment.id).order_by('score')[median:1] median_score = median_exam.score But it always returns an empty list. I can get the result I want with this: e = Exam.objects.all() total = e.count() median = int(round(total / 2)) exams = Exam.objects.filter(assessment=assessment.id).order_by('score') median_score = median_exam[median].score I would just prefer not to have to query the entire set of exams. I thought about just writing a raw MySQL query that looks something like: SELECT score FROM assess_exam WHERE assessment_id = 5 ORDER BY score LIMIT 690,1 But if possible, I'd like to stay within Django's ORM. Mostly, it's just bothering me that I can't seem to use order_by with a filter and a limit. Any ideas?

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  • How to check a local wifi connection

    - by Thomas Joos
    hi all, I'm writing an app which connects to a static ip adress in a local network. How can I check if I have a local network connection? I want to connect to http://192.168.2.5 and i tried using the Rechability class but it returns FALSE, while the device is definately connected ( when i don't do the check, the app works fine so there is a connection ): Reachability *r = [Reachability reachabilityWithHostName:@"http://192.168.2.5"]; NetworkStatus internetStatus = [r currentReachabilityStatus]; How should work this out? Thomas

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  • Algorithm for matching partially filled words

    - by adnanhb
    Hello All, I am writing a game which when given a partially filled word, searches a dictionary and returns all the matching words. To that effect, I am trying to find an algorithm that can be used for the said purpose. For example, given - - a -, the algorithm will search a dictionary for all the words which have length 4 and have 'a' as the third letter. Is there such an algorithm already? If not, can somebody given a rough idea of how to design such an algorithm? Thanks in Advance.

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  • Cakephp doesn't write a cookie

    - by radious
    Hello! I have a problem with writing cookies in cakephp and even don't know how to debug it or where too look for a clue. I've inherited a project where cookie were only created using the Session component, of course i added 'Cookie' to $components array in app_controller and put this in beforeFilter: $this->Cookie->name = 'foo'; $this->Cookie->path = '/home/~nick'; $this->Cookie->domain = 'hostname'; $this->Cookie->secure = false; //i.e. only sent if using secure HTTPS $this->Cookie->key = 'some key'; and in some action i use: $this->Cookie->write('key', 'value'); I access page by http://hostname/home/~nick/foo and actually try to put even something so silly. I doesn't work. I would be really gratefully for any clue where to search problem. Thanks!

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  • C: evaluate part of the string

    - by Halst
    I cant find an expression to evaluate a part of a string. I want to get something like that: if (string[4:8]=='abc') {...} I started writing like this: if (string[4]=='a' && string[5]=='b' && string[6]=='c') {...} but if i need to evaluate a big part of string like if (string[10:40] == another_string) {...} then it gets to write TOO much expressions. Are there any ready-to-use solutions?

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  • Creating an iphone book application

    - by ennuikiller
    I have some experience creating iphone applications and would now like to create an iphone book application. Browsing the Book category in iTunes it seems to there is a standard format for building these apps, however, googling for how to build an iphone book app produces no useful results. This type of application is also not addressed in any of the iphone development books I've seen. Is there a standard method fot building these book applications? Or is it simply copying the text is some format (pdf, txt, html?) and then writing a document handling api? It seems there already must exist apis for doing this. Can anyone point me in the right direction. Thanks in advance!

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  • Is using jquery to call a WCF Data Service from the UI violating the MVC pattern.

    - by Lee Dale
    I'm fairly new to ASP.Net MVC 2 and understand the MVC pattern in itself. But my question is what's the best way to populate dropdownlists in the UI sticking to the MVC pattern. Should I be going through the controller? Every article I've seen to do this shows how to do it using javascript and jquery. I have a test application that I'm re-writing in MVC2 I have my dropdowns working with jquery basically calling a WCF Data Service that returns JSON which populates the dropdowns. Seems to me though that this is bypassing the controller and going straight to the model therefore strictly violating the MVC pattern. Or am I missing something obvious here. You thoughts or best practices would be greatly welcome here. Thanks

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  • Twitter API and rate limiting - I am confused

    - by jeffreyveon
    I am new to the Twitter API, and I looked at their whitelisting policies and I am a little confused... I'm basically writing a twitter aggregrator that crawls the public tweets of a set of users (not more than 200) hourly. I wanted to apply for whitelisting, and they seem to offer account based and IP based whitelisting. Since I am using a shared hosting, my outbound IP address might vary (and twitter does'nt allow IP ranges for whitelisting). So I am considering using account based whitelisting. However, while using OAuth, is it possible for me to use account based whitelisting for a background process that crawls the API hourly?

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  • Function returns CSV File: How to go about checking it ?

    - by Rachel
    I am doing something like: $outputFile = getCurrentDBSnapshot($data); where $data is the resource stream that am passing in, basically from command prompt am passing an file and am opening it using fopen for writing with 'w+' permissions, now getCurrentDBSnapshot would get the current state of a table and would update the $data csv file, so basically $outputFile would be updated with the current state of database table, now I want to var_dump or print the value of $outputFile to see the data present into it. But when I do $this->fout = fopen($outputFile,'r') or die('Cannot open file'); $test = fgetcsv($outputFile,5000,":"); var_dump($test); It gives me an error saying that it expects parameter 1 to be a string type and am passing resource. My goal to see the contains of $outputFile and so my question is that How can I see the contains present in $outputFile or how can I see what getcurrentDBSnapshot function is returning me ?

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  • how to write re-usable views in django?

    - by rz
    These are the techniques that I use regularly to make my views reusable: take the template_name as an argument with a default take an optional extra_context which defaults to empty {} right before the template is rendered the context is updated with the extra_context for further re-usability, call any callable in extra_context.values() whenever the view deals with a queryset, there is a queryset argument with a default whenever the view needs a particular object from the ORM, it attempts to fetch it using any "id" parameter in several ways (e.g. as a slug, as a database id) (this may be a bad practice...) First, Should I add anything to my list? Should I remove anything from my list? The items accommodates a large number of cases. However, whenever an app extends a model of another in some way (e.g. adding a field or changing the behavior in some way) I end up writing my own views and only reusing the model. Is this normal?

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  • editing a file with vim that has no EOL marker on the last line but has CRLF line endings

    - by rmeador
    I often have to edit script files, the interpreter for which treats files that have an EOL marker on the last line of the file as an error (i.e. the file is treating CRLF as "newlines", not as "line endings"). Currently, I open these files in Vim using binary mode (-b on the command line). It autodetects the lack of EOL on the final line and sets the "noeol" option appropriately, which prevents it from writing an EOL on the last line. Because the file has CRLF line endings, I get lots of ^Ms at the end of my lines (because it interprets only Unix-style line endings in binary mode, it seems). I can't open it in text mode because the "noeol" option is ignored for non-binary files. This is very annoying, and I always have to remember to manually type the ^M at the end of each line! Is there some way I can force it to accept DOS-style line endings in binary mode, or force it to listen to the EOL option in text mode?

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  • Get last n lines of a file with Python, similar to tail

    - by Armin Ronacher
    I'm writing a log file viewer for a web application and for that I want to paginate through the lines of the log file. The items in the file are line based with the newest item on the bottom. So I need a tail() method that can read n lines from the bottom and supports an offset. What I came up with looks like this: def tail(f, n, offset=0): """Reads a n lines from f with an offset of offset lines.""" avg_line_length = 74 to_read = n + offset while 1: try: f.seek(-(avg_line_length * to_read), 2) except IOError: # woops. apparently file is smaller than what we want # to step back, go to the beginning instead f.seek(0) pos = f.tell() lines = f.read().splitlines() if len(lines) >= to_read or pos == 0: return lines[-to_read:offset and -offset or None] avg_line_length *= 1.3 Is this a reasonable approach? What is the recommended way to tail log files with offsets?

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  • How to start recognizing design patterns as you are programming?

    - by Jon Erickson
    I have general academic knowledge of the various design patterns that are discussed in GoF and Head First Design Patterns, but I have a difficult time applying them to the code that I am writing. A goal for me this year is to be able to recognize design patterns that are emerging from the code that I write. Obviously this comes with experience (I have about 2 years in the field), but my question is how can I jumpstart my ability to recognize design patterns as I am coding, maybe a suggestion as to what patterns are easiest to start applying in client-server applications (in my case mainly c# webforms with ms sql db's, but this could definitely be language agnostic).

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  • Does a multithreaded crawler in Python really speed things up?

    - by beagleguy
    Was looking to write a little web crawler in python. I was starting to investigate writing it as a multithreaded script, one pool of threads downloading and one pool processing results. Due to the GIL would it actually do simultaneous downloading? How does the GIL affect a web crawler? Would each thread pick some data off the socket, then move on to the next thread, let it pick some data off the socket, etc..? Basically I'm asking is doing a multi-threaded crawler in python really going to buy me much performance vs single threaded? thanks!

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