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  • passing Func<TSource, TKey> keySelector error

    - by user338429
    static void Main() { string[] a = { "a", "asd", "bdfsd", "we" }; a = a.OrderBy(fun).ToArray(); } private static int fun(string s) { return s.Length; } its is giving compile time error . I know that we can do this with Lambda expression like this. a.OrderBy(s=>s.Length).ToArray(); but i want to this do by defining different function . What mistake i have done?

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  • Determining if types alias to the same underlying type in C++

    - by emchristiansen
    I'd like to write a templated function which changes its behavior depending on template class types passed in. To do this, I'd like to determine the type passed in. For example, something like this: template <class T> void foo() { if (T == int) { // Sadly, this sort of comparison doesn't work printf("Template parameter was int\n"); } else if (T == char) { printf("Template parameter was char\n"); } } Is this possible?

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  • Calculating all distances between one point and a group of points efficiently in R

    - by dbarbosa
    Hi, First of all, I am new to R (I started yesterday). I have two groups of points, data and centers, the first one of size n and the second of size K (for instance, n = 3823 and K = 10), and for each i in the first set, I need to find j in the second with the minimum distance. My idea is simple: for each i, let dist[j] be the distance between i and j, I only need to use which.min(dist) to find what I am looking for. Each point is an array of 64 doubles, so > dim(data) [1] 3823 64 > dim(centers) [1] 10 64 I have tried with for (i in 1:n) { for (j in 1:K) { d[j] <- sqrt(sum((centers[j,] - data[i,])^2)) } S[i] <- which.min(d) } which is extremely slow (with n = 200, it takes more than 40s!!). The fastest solution that I wrote is distance <- function(point, group) { return(dist(t(array(c(point, t(group)), dim=c(ncol(group), 1+nrow(group)))))[1:nrow(group)]) } for (i in 1:n) { d <- distance(data[i,], centers) which.min(d) } Even if it does a lot of computation that I don't use (because dist(m) computes the distance between all rows of m), it is way more faster than the other one (can anyone explain why?), but it is not fast enough for what I need, because it will not be used only once. And also, the distance code is very ugly. I tried to replace it with distance <- function(point, group) { return (dist(rbind(point,group))[1:nrow(group)]) } but this seems to be twice slower. I also tried to use dist for each pair, but it is also slower. I don't know what to do now. It seems like I am doing something very wrong. Any idea on how to do this more efficiently? ps: I need this to implement k-means by hand (and I need to do it, it is part of an assignment). I believe I will only need Euclidian distance, but I am not yet sure, so I will prefer to have some code where the distance computation can be replaced easily. stats::kmeans do all computation in less than one second.

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  • Stop setInterval call in javascript

    - by cnu
    I am using setInterval(fname, 10000); to call a function every 10 secs in javascript. Is it possible to stop calling the calling on some event? I want the user to be able to stop the repeated refresh of data.

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  • jQuery equivalent of PHP's file_exists()?

    - by Scott B
    In the code snippet below, from my jQuery setup, I need to check if the image file actually exists and if not, I'd like to substitute a default image. Currently if the file does not exist, I just get a broken image placeholder... $('#myTheme').change ( function() { var myImage = $('#myTheme :selected').text(); $('.selectedImage img').attr('src','../wp-content/themes/myTheme/styles/'+myImage+'/screenshot.jpg'); //if screenshot.jpg does not exist, use "../../default.jpg" instead } );

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  • $ is not define on firfox in jQuery

    - by Alvin
    Hi, Whenever I try to load the following part in tag on firfox browser, I get the message as "$ is not define". May I know the reason? I'm trying to load the jquery.js file before loading any custom script after CSS part. <script type="text/javascript" src="jquery.js"></script> <script type="text/javascript"> $(document).ready(function(){

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  • Printing values of all fields in C++ structure

    - by Zhinkaas
    Say a simple structure struct abc { int a; char b; } I got some value in a variable defined as its structure and now I want to print below a = [some value] b = [some character] What is the best way to achieve this for an arbitrary structure without having to write a dump...(...) function for each of the structure I encounter?

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  • creating lib file inc

    - by user222820
    hi there i have written a very simple program that has a SUM function i wanna create a .lib file how can i do it please help me my program is c in windows xp int sum(int a , int b) { return a + b; }

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  • Combining two input fields to one, jquery

    - by nic_dk
    Im trying to combine the name field, and msg field, and input all values into #msg, but cant quite get it to work $('#DocumentCommentsForm_21').bind('submit', function(){ var name = "##" + $('#navn').val() + "##"; var msg = $('#msg').val(); $('#msg').val(name+' '+msg); }); alert($('#msg').val(name+' '+msg));

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  • jquery adding required to a dropdownbox [SOLVED]

    - by Crays
    Hi i would like to know how do i add a required attribute to a dropdownbox? I've search numerous ways but none worked, here's my code <script> $(document).ready(function(){ $('.orderingmenu .burgers').change(function(){ var selectVal= $(this).val(); if(selectVal != 'none'){ $(this).next().attr('required', true); } }); }); </script> i am really out of idea on how to do this, i tested the selectors and they're working fine, but it just doesn't seem to add in the required attribute to that select field =/ any help please? what i have tried is $(this).next().prop('required', true); $(this).next().attr('required', 'true'); $(this).next().attr('required', ''); $(this).next().prop('required'); none have worked =/ EDIT the HTML <div class="orderingmenu" style="margin-bottom: 0.5%;"> <select name="burgerlist" class="burgers" style="width: 35%; float: left; font-size: 12px;"> <option selected="selected" value="none">NONE</option> <option value="A">A</option> </select> <select name="option" id="option" class="setornot" style="width: 30%; font-size: 12px;"> <option selected="selected" value="none">NONE</option> <option value="ALA CARTE">ALA CARTE</option> <option value="SET">SET</option> </select> <input type="text" placeholder="ANY REMARKS?" name="remarks" style="width: 30%; float: right; font-size: 12px;"> </div> i had it looped with a php script, but basically what i wanted to do is so that if there is any selection other than 'none', the other selection is required. EDIT 2 found out the problem was that i had the value for none!

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  • How can i Import a Managed C# dll into a Win32 C++ project ?

    - by Agito
    I am working on a solution, most of its core engine is developed as Win32 C++ (and is Platform independent and is also used on OS X), some time ago we needed to call C++ dll's of core engine from C# and I was able to Load main solution's DLL in C# (by the help of some threads here on SO). but now we have certain things implemented in Managed C# dll and need to use it in Win32 C++ project? (and just function definitions and dll are provided)

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  • Linq Having Sum(Quantity) = x?

    - by molgan
    Hello I have a function that returns IQueryable, and I would like to add "HAVING SUM(Quantity) = X" to it, but I get error if I try like this: _rep.GetBookings().ByBookingObjectID(bookingObjectID).Sum(x => x.Quantity == somevariablehere); I cant seem to find functions for it to find by sum /M

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  • simple method that checks text is email with regular expression

    - by user223863
    Can't believe how difficult this seems to be all I want to is to validate a user inout using javascript to make sure that it is an email address. But can't get it to work: I am using: //validates a regulaer expression Utilities2.prototype.validateEmail = function(stringToValidateArg) { alert('about to check regexp'); var regExpPattern = /^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/; alert(regExpPattern.test(stringToValidateArg)); } But this always returns false, any ideas why is it because of the regular expression?

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  • check all values match using prototype

    - by snaken
    Using prototype, is there a simple method of checking that a group of values match, for example - can this code be refined to a single line or something otherwise more elegant? var val = ''; var fail = false; $('form').select('.class').each(function(e){ if(!val){ val = $F(e); }else{ if(val != $F(e)) fail = true; } });

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  • Windsore dependency

    - by jack
    I have a class with contructure like this public UserRepository(IBlockRepository blockRepos) { } and again, I have another class with the constructure function like this public BlockRepository(IUserRepository userRepo) { } this cause the Windsor error : Castle.MicroKernel.Handlers.HandlerException: Can't create component 'UserRepository' as it has dependencies to be satisfied. UserRepository is waiting for the following dependencies I don't know how to fix it , please help me. Many thanks

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  • facebook access_token problem

    - by user559711
    Hi, I just wrote a little application(4 page php), everything work fine, however, I have a question that, do I need to create a new instance of facebook (just like $facebook = new facebook.....) in every new php page, or just pass a access token or session? If only pass the access token, how can I use the function $faceook-api('something'); to acheive the data? Because I'm a beginner of php, I have no idea how access token work, please help, thanks a lot! Regards, YK

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  • jQuery apply functionality only to class and parent elements.

    - by kylex
    I have the following list: <ul> <li class="topCurrent">One <ul> <li>One-1 <ul> <li>One-1.1 <ul> <li class="current">One-1.1.1 <ul> <li>One-1.1.1.1</li> <li>One-1.1.1.2</li> <li>One-1.1.1.3</li> </ul> </li> <li>One-1.1.2</li> </ul> </li> <li>One-1.2</li> </ul> </li> <li>One-2</li> <li>One-3</li> </ul> </li> <li>Two <ul> <li>Two-1</li> <li>Two-2</li> </ul> </li> Using the following jQuery: $("ul li ul").hide(); $("ul li").hoverIntent( function(){ $(this).children('ul').slideDown('fast'); }, function(){ $(this).children('ul').slideUp('fast'); } ); What this does is hide all of the ul below the top level ul until there is a hover over it. What I would like to do is this: If an li has a class="current" I would like that structure to be open up until the point that current is hit. It would still allow the ul below it to be displayed on a hover, as well as any other ul's, but at no point would the parents of class="current" be hidden. Suggestions? This problem has been driving me crazy. Thanks!

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  • MATLAB: comparing 2 columns content

    - by Patrick
    hi, I need to compare the content of 2 tables, more exactly 2 columns (1 column per table) in Matlab to see, for each element of the firsts column, there is an equal element in the second column. Should I use a for loop or is there any MATLAB function doing this ? thanks

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  • checkbox val not showing false

    - by user281180
    I have the follwoing code: $("input:checkbox").live('click', function() { alert($(this).val()); }); True is shown if the checkbox is checked. However, if the checkbox is checked and I uncheck it, the value shown is still true. How can I correct that? What is wrong with the code? Thanks

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