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  • How do functional programming languages work?

    - by eSKay
    I was just reading this excellent post, and got some better understanding of what exactly object oriented programming is, how Java implements it in one extreme manner, and how functional programming languages are a contrast. What I was thinking is this: if functional programming languages cannot save any state, how do they do some simple stuff like reading input from a user (I mean how do they "store" it), or storing any data for that matter? For example - how would this simple C thing translate to any functional programming language, for example haskell? #include<stdio.h> int main() { int no; scanf("%d",&no); return 0; }

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  • Sorting an array in PHP based on different values

    - by Jimbo
    I have an array whose elements are name, reversed_name, first_initial and second_initial. A typical row is "Aaron Smith", "Smith, Aaron", "a", "s". Each row in the array has a first_initial or second_initial value of "a". I need to display the rows alphabetically but based on the "a" part, so that either the name or reversed_name will be displayed. An example output would be: Aaron Smith Abbot, Paul Adrian Jones Anita Thompson Atherton, Susan I really have no idea how to sort the array this way so any help will be much appreciated!

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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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  • insert or update on table violates foreign key constraint

    - by sprasad12
    Hi, I have two tables entitytype and project. Here are the create table statements: Create table project ( pname varchar(20) not null, primary key(pname) ); create table entitytype( entityname varchar(20) not null, toppos char(100), leftpos char(100), pname varchar(20) not null, primary key(entityname), foreign key(pname) references project(pname) on delete cascade on update cascade ); Now when i try to insert any values into entitytype table i am getting the following error: ERROR: insert or update on table "entitytype" violates foreign key constraint "entitytype_pname_fkey" Detail: Key (pname)=(494) is not present in table "project". Can someone please shed some light on what i am doing wrong. Any input will be of great help. Thank you.

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  • Debugging Objective C JNI code

    - by thatidiotguy
    Here is the situation: I have a client's java project open in eclipse. It uses a JNI library created by an Xcode Objective C project. Is there any good way for me to debug the C code from eclipse when I execute the Java code? Obviously eclipse's default debugger cannot step into the jni library file and we lose the thread (thread meaning investigative thread here, not programming thread). Any advice or input is appreciated as the code base is large enough that following the client's code will be radically faster than other options. Thanks. EDIT: It should be noted that the reason that the jni library is written in Objective-C is because it is integrating with Mac OSX. It is using the Cocoa framework to integrate with the Apple speech api.

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  • sql: can i do a max(count(*)) ?

    - by every_answer_gets_a_point
    here's my code: select yr,count(*) from movie join casting on casting.movieid=movie.id join actor on casting.actorid = actor.id where actor.name = 'John Travolta' group by yr here's the question Which were the busiest years for 'John Travolta'. Show the number of movies he made for each year. here's the table structure movie(id, title, yr, score, votes, director) actor(id, name) casting(movieid, actorid, ord) this is the output i am getting: yr count(*) 1976 1 1977 1 1978 1 1981 1 1994 1 etcetc i need to get the rows for which count(*) is max how do i do this?

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  • Using IDataErrorInfo and setting Validation.HasError style

    - by Gaurav
    In WPF using IDataErrorInfo and Style I want to create form where I can provide end user three different status while validating data To make the scenario more clear 1) I have textbox next to it I have icon which provides end user what kind of input textbox expects - Initial status with information icon 2) As soon as user enter data it validates it and decides whether it is valid or not - most of the time it will show cross (X) icon saying invalid data 3) As it is validating on UpdateSourceTrigger="PropertyChanged" it will turn cross icon to green check mark as soon as it gets validated i.e [ ] i (tooltip- Any valid user name ) [Ga ] X (tooltip- Invalid user name. Must be 5 char long) [Gaurav ] * (it will show only correct icon, meaning valid value) How can I achieve this using IDataErrorInfo and Style, I tried doing that but as soon as my form gets loaded it invalidates all the data and shows cross icon at the first time. I want to show different tooltip and different icon for three states (Initial info, Invalid data, Valid data)

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  • Debugging ASP.NET Strings Downloaded to Browser

    - by jdk
    I'm downloading a vCard to the browser using Response.Write to output .NET strings with special accented characters. Mime type is text/x-vcard and French characters are appearing wrong in Outlook, for example Montréal;Québec .NET string shows as Montréal Québec in browser. I'm using this vCard code from CodeProject.com I've played with the System.Encoding sample code at the bottom of this linked MSDN page to convert the unicode string into bytes and then write the ascii bytes but then I get Montr?al Qu?bec (progress but not a win). Also I've tried setting content type to both us-ascii and utf-8 of the response. Apparently the vcard file downloads as unicode. If I save it as ASCII text and open in Outlook it's okay. So my assumption is I need to cause download of ASCII but am unsure if I'm doing it wrong or have a misunderstanding of where to start.

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  • How to validate parameter values against a data source in Crystal Reports 2008

    - by mjh41
    I have a report designed in Crystal 2008. The report has a parameter field called "Member ID" that I want to use to get a string input from the user running the report. However, I want to do some sort of validation to ensure that the ID they entered is valid (it exists in a database table that I already have set up). Is there any way to do this? I know you can set up dynamic parameters that would give the user a dropdown list of Member ID values to choose from based on the data stored in my database table. But I don't want to make the user sort through thousands of IDs in a dropdown. I just want them to manually enter an ID and then have the report check the entered value against a database table. Is this possible?

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  • Build Issue with multi module project

    - by vijay.shad
    Hi, I have a multi module web project. Four modules of the project are packaged as jar and added as dependency to the fifth module, which is packaged as war. When it is time to deploy the application i just run package on the war project and my war is created with all the dependencies. Now there is a problem. One of the my module have heavy changes. Now when i created war for my projects these changes was not reflected in the output war file(the jar in lib folder of war has still the old code). Can you please point the things i am missing from the release process? Why the old code is being packaged with the war? Can you please point some good resource for real file build process using maven? Regards, Vijay

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  • Rails 2.x http basic authentication

    - by randombits
    I'm trying to get basic http authentication working on my Rails app. I'm offering a simple REST interface served by a Rails server, only xml/json output. Every method needs authentication, so I put the authenticate filter in ApplicationController: class ApplicationController < ActionController::Base helper :all # include all helpers, all the time before_filter :authenticate protected def authenticate authenticate_or_request_with_http_basic do |u, p| true end end end Even with having the method return true, I'm receiving a 401 from the server: $ curl http://127.0.0.1:3000/myresource/1.xml -i HTTP/1.1 401 Unauthorized Cache-Control: no-cache WWW-Authenticate: Basic realm="Application" X-Runtime: 1 Content-Type: text/html; charset=utf-8 Content-Length: 27 Server: WEBrick/1.3.1 (Ruby/1.9.1/2010-01-10) Date: Thu, 03 Jun 2010 02:43:55 GMT Connection: Keep-Alive HTTP Basic: Access denied. If I'm explicitly returning true, yet getting served a 401.

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  • Convert IEnumerable<dynamic> to JsonArray

    - by Burt
    I am selecting an IEnumerable<dynamic> from the database using Rob Conery's Massive framework. The structure comes back in a flat format Poco C#. I need to transform the data and output it to a Json array (format show at bottom). I thought I could do the transform using linq (my unsuccessful effort is shown below): using System.Collections.Generic; using System.Json; using System.Linq; using System.ServiceModel.Web; .... IEnumerable<dynamic> list = _repository.All("", "", 0).ToList(); JsonArray returnValue = from item in list select new JsonObject() { Name = item.Test, Data = new dyamic(){...}... }; Here is the Json I am trying to generate: [ { "id": "1", "title": "Data Title", "data": [ { "column1 name": "the value", "column2 name": "the value", "column3 name": "", "column4 name": "the value" } ] }, { "id": "2", "title": "Data Title", "data": [ { "column1 name": "the value", "column2 name": "the value", "column3 name": "the value", "column4 name": "the value" } ] } ]

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  • jquery json null when using localhost

    - by Eeyore
    I am trying to load json generated by my django app. It works when I save the json output and load it from a static file. However, when I make a call to a server it returns null. JSON {"users": [ { "id": 1, "name": "arnold" }, { "id": 2, "name": "frankie" } ]} Ajax call $.ajax({ url: "http://localhost:8000/json", //vs. json.js dataType: 'json', type: 'get', timeout: 20000, error: function() { alert("error"); }, beforeSend: function() { alert("beforeSend"); }, complete: function() { alert("complete"); }, success: function(data) { alert(data.users[0].name); } }); view.py return HttpResponse(simplejson.dumps(data), content_type = 'application/json; charset=utf8')

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  • Preventing mouse emulation events (ie click) from touch events in Mobile Safari / iPhone using Javas

    - by Jaime Cham
    In doing a single page Javascript app with interactive DOM elements I've found that the "mouseover-mousemove-mousedown-mouseup-click" sequence happens all in a bunch after the "touchstart-touchmove-touchend" sequence of events. I've also found that it is possible to prevent the "mouse*-click" events from happening by doing an "event.preventDefault()" during the touchstart event, but only then, and not during the touchmove and touchend. This is a strange design, because because it is not possible to know during the touchstart yet whether the user intents to drag or swipe or just tap/click on the item. I ended up setting up a "ignore_next_click" flag somewhere tied to a timestamp, but this is obviously not very clean. Does anybody know of a better way of doing this, or are we missing something? Note that while a "click" can be recognized as a "touchstart-touchend" sequence (ie no "touchmove"), there are certain things, such as keyboard input focus, that can only happen during a proper click event.

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  • GData for my own API?

    - by Malax
    Hi StackOverflow! Im currently planning to build an API for my service. I want to use GData because it fits the application scheme and there are libraries for many programming languages available. The first question that rose: Am I allowed to do that? I mean, Google put lots of work into the GData specification and have some sort of copyright. Does anyone know anything about this issue or did that before? You could extend the case if you want to specifically mimic an API which uses GData like the YouTube API to have my API 100% compliant. This is not my case, but I was wondering about that too. :-) Thank you for any input, Malax Edit: Note that i want to use it for my own service. So, I am implementing an API using the GData protocol, not using one of the Google APIs.

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  • How to troubleshoot deallocation of object in uitableview?

    - by 4thSpace
    I have a table view with tall cells. About 300 in height. The cells are custom and have an associated nib. In cellForRowAtIndexPath, I access an object in an array using indexPath.row. The object has properties, which I assign to labels on the custom cell. This works fine for the first two cells. Once I scroll enough for the third cell to get created, the app crashes. I have NSZombieEnabled set and here is the output: 2010-04-19 21:48:13.360 MyApp[54463:207] *** -[CALayer release]: message sent to deallocated instance 0xfc4e50 (gdb) continue 2010-04-19 21:48:18.382 MyApp[54463:207] *** NSInvocation: warning: object 0xfc4e50 of class '_NSZombie_CALayer' does not implement methodSignatureForSelector: -- trouble ahead 2010-04-19 21:48:18.383 MyApp[54463:207] *** NSInvocation: warning: object 0xfc4e50 of class '_NSZombie_CALayer' does not implement doesNotRecognizeSelector: -- abort (gdb) continue Program received signal: “EXC_BAD_ACCESS”. (gdb) I'm not sure what is deallocated. How can I trace this to the source?

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  • Convert ieee 754 float to hex with c - printf

    - by Michael
    Ideally the following code would take a float in IEEE 754 representation and convert it into hexadecimal void convert() //gets the float input from user and turns it into hexadecimal { float f; printf("Enter float: "); scanf("%f", &f); printf("hex is %x", f); } I'm not too sure what's going wrong. It's converting the number into a hexadecimal number, but a very wrong one. 123.1443 gives 40000000 43.3 gives 60000000 8 gives 0 so it's doing something, I'm just not too sure what. Help would be appreciated

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  • MYSQL Fast Insert dependent on flag from a seperate table

    - by Stuart P
    Hi all. For work I'm dealing with a large database (160 million + rows a year, 10 years of data) and have a quandary; A large percentage of the data we upload is null data and I'd like to stop it from being uploaded. The data in question is spatial in nature, so I have one table like so: idLocations (Auto-increment int, PK) X (float) Y (foat) Alwaysignore (Bool) Which is used as a reference in a second table like so: idLocations (Int, PK, "FK") idDates (Int, PK, "FK") DATA1 (float) DATA2 (float) ... DATA7 (float) So, Ideally I'd like to find a method where I can do something like: INSERT INTO tblData(idLocations, idDates, DATA1, ..., DATA7) VALUES (...), ..., (...) WHERE VALUES(idLocations) NOT LIKE (SELECT FROM tblLocation WHERE alwaysignore=TRUE ON DUPLICATE KEY UPDATE DATA1=VALUES(DATA1) So, for my large batch of input data (250 values in a block), ignore the inserts where the idLocations matches an idLocations values flagged with alwaysignore. Anyone have any suggestions? Cheers. -Stuart Other details: Running MySQL on a semi-dedicated machine, MyISAM engine for the tables.

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  • Change Cursor for Netbeans on Linux

    - by Daziplqa
    Hi, I am recently have been successfully installed NetBean 6.8 on Ubuntu Box (10.04). But the problem is, NetBeans doesn't use the Gnome mouse Cursor by default. instead, It uses some freak mouse cursor that I hate! So, do you have any idea about how to change the cursor that appears inside netbeans.(I have looked inside tools options but without any output) Also I have did: $ grep -iR cursor * Binary file var/cache/all-resources.dat matches Binary file var/cache/all-layers.dat matches Binary file var/cache/index/s2/javascript/8/1/_0.cfs matches (note, I didn't talked here about how to change the cursor inside some Java program written in NetBeans) Thanks in advance.

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  • CSS Selector not working on elements within a div

    - by stevebot
    Hi, I have the following HTML structure: <div class="formFields"> <label> Field 1: </label> <input type="text" value="" name="field1" /> </div> And my CSS selectors are as follows: #formFields {clear:both;} #formFields label {font-weight:bold;} The clear:both; is being applied to the div, but the font-weight:bold; is not being applied to the labels. How would I apply this font-weight to the labels?

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  • Apache ErrorDocument not working for PHP 500 error

    - by Jason
    I have a number of ErrorDocuments setup in my .htaccess file for errors such as 404, 401, 403 etc which all redirect to my error page but the ErrorDocument set for a 500 error is never displayed when PHP reports a 500. The 500 code is sent to the browser and the output is blank. Is there something special I need to do to enable 500 error documents for use with PHP? My directives look like this: ErrorDocument 401 /errorpage.php?error=401 ErrorDocument 403 /errorpage.php?error=403 ErrorDocument 404 /errorpage.php?error=404 ErrorDocument 500 /errorpage.php?error=500 I've looked through the php.ini and can't see anything that would obviously override the Apache settings and there are no ErrorDocument directives in my httpd.conf either. Anywhere else I should be looking? Thanks in advance.

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  • Generating a text file in MYSQL stored procedure

    - by Pablo
    Hi, I'm new to MySQL, I am trying to create a text file using a stored procedure. I'm currently at the stage where I have a temporary table that contains all of the records that I want to output to a text file. I have the following line at the end of my SP, it works in PHPMYAdmin's query but it does not work when part of a stored procedure the code is as follows: SELECT * into outfile '../../htdocs/VIP/Temp/temp.txt' from tmp_Menu2; note that tmp_Menu2 is a table that only includes one field of type VARCHAR(1000) Any help would be greathly appreciated. Thank you,

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  • Perl equivalent to Java's "throws" clausule.

    - by Konerak
    Is there a way in Perl to declare that a method can throw an error (or die)? I always loved how in Java, a method could handle an Exception and/or throw it. The method signature allows to put "throws MyException", so a good IDE/compiler would know that if you use said method somewhere in your code, you'd have to check for the Exception or declare your function to "throws" the Exception further. I'm unable to find something alike in Perl. A collegue of mine wrote a method which "dies" on incorrect input, but I forget to eval-if($@) it... offcourse the error was only discovered while a user was running the application. (offcourse I doubt if there is any existing IDE that could find these kind of things for Perl, but atleast perl -cw should be able to, no?)

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  • convert ArrayList.toString() back to ArrayList in one call

    - by dotnetnewbie
    I have a toString() representation of an ArrayList. Copying the toString() value to clipboard, I want to copy it back into my IDE editor, and create the ArrayList instance in one line. In fact, what I'm really doing is this: my ArrayList.toString() has data I need to setup a unit test. I want to copy this ArrayList.toString() into my editor to build a test against this edge case I don't want to parse anything by hand My input looks like this: [15.82, 15.870000000000001, 15.92, 16.32, 16.32, 16.32, 16.32, 17.05, 17.05, 17.05, 17.05, 18.29, 18.29, 19.16] The following do not work: Arrays.asList() google collections Lists.newArrayList() Suggestions?

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  • MOSS 2007 BDC Profile Import fails for a few users

    - by Hobber
    We have set up a BDC Profile Import for Sharepoint 2007 and it works well for 99% of the users. A handful fails with the "Exception occured when calling into BIL connector for import from non master data source" message in the crawl log, though The ULS logs reveal the following information: Exception Profile Import: Exception occured when importing user: '[redacted]\[redacted]'. Microsoft.Office.Server.UserProfiles.PropertyInvalidValueException: Invalid Property Value: Could not find SID corresponding to input account name I have confirmed that the user has a sharepoint profile matching the username is a valid domain user exists in AD Can anyone help med troubleshoot this?

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