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  • Haskell Add Function Return to List Until Certain Length

    - by kienjakenobi
    I want to write a function which takes a list and constructs a subset of that list of a certain length based on the output of a function. If I were simply interested in the first 50 elements of the sorted list xs, then I would use fst (splitAt 50 (sort xs)). However, the problem is that elements in my list rely on other elements in the same list. If I choose element p, then I MUST also choose elements q and r, even if they are not in the first 50 elements of my list. I am using a function finderFunc which takes an element a from the list xs and returns a list with the element a and all of its required elements. finderFunc works fine. Now, the challenge is to write a function which builds a list whose total length is 50 based on multiple outputs of finderFunc. Here is my attempt at this: finish :: [a] -> [a] -> [a] --This is the base case, which adds nothing to the final list finish [] fs = [] --The function is recursive, so the fs variable is necessary so that finish -- can forward the incomplete list to itself. finish ps fs -- If the final list fs is too small, add elements to it | length fs < 50 && length (fs ++ newrs) <= 50 = fs ++ finish newps newrs -- If the length is met, then add nothing to the list and quit | length fs >= 50 = finish [] fs -- These guard statements are currently lacking, not the main problem | otherwise = finish [] fs where --Sort the candidate list sortedps = sort ps --(finderFunc a) returns a list of type [a] containing a and all the -- elements which are required to go with it. This is the interesting -- bit. rs is also a subset of the candidate list ps. rs = finderFunc (head sortedps) --Remove those elements which are already in the final list, because -- there can be overlap newrs = filter (`notElem` fs) rs --Remove the elements we will add to the list from the new list -- of candidates newps = filter (`notElem` rs) ps I realize that the above if statements will, in some cases, not give me a list of exactly 50 elements. This is not the main problem, right now. The problem is that my function finish does not work at all as I would expect it to. Not only does it produce duplicate elements in the output list, but it sometimes goes far above the total number of elements I want to have in the list. The way this is written, I usually call it with an empty list, such as: finish xs [], so that the list it builds on starts as an empty list.

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  • C - Call a function

    - by Pedro
    Hello. I want to get a value from a function in other function i think i have to call a function in other function, then call it on main, but how? void funcA(PEOPLE people[], int *total){ FILE *fp; char line[100]; fp=fopen("example.txt","r"); if(fp==NULL){ exit(1); } else{ fgets(line, 100, fp);//get a number from the txt total=atoi(linha);//convert to int } } void funcB(PEOPLE people[], int *total){ int i; for(i=0;i<total;i++){ printf("%s\n",people[i].name); } funcA(people,&total); } void main(){ PERSON person[100]; int *total; funcB(people,&total); } What i'm doing wrong?

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  • jQuery recursive function to upload many files while giving the user some feedback

    - by checcco
    Hi guys, I'm trying to write a jQuery function to let users upload many files at once. Here's the function I thought to give the user some feedback about the upload process progress. function uploadFiles(numbersOfFiles, start) { $("#info").html(start + " files uploaded"); $.post('upload.php', { start: start }, function (data) { start += 5; if (start < numbersOfFiles) { $("#info").html(start + " files uploaded"); uploadFiles(numbersOfFiles, start); } else { $("#info").html("All files have been uploaded"); } }); } The function calls a php script to upload 5 files, then if there are more files to upload it calls the script again. The whole process works. I've tried it with 100 files. The only thing that doesn't work is the #info div updating. The div get updated the first time and then again only to show "All files have been uploaded". So there's no feedback for the user about the uploading process. I can't understand why... Any help?

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  • Can you step into specific properties in VS 2010?

    - by cyclotis04
    I know that you can either step into every property or not step into every property, but I would really like to be able to step into a specific property, and not the rest. Is this possible? (I also know I can use keyboard commands, but I'm asking if there's a more permanent solution.) I have a lot of properties and my setters do important things, so it's silly to step over them, but most of my getters are pointless. I'm looking for something like: public string ImportantProperty { get { return _importantProperty; } [DebuggerStepThrough(false)] set { if (this.State != ConnectionState.Closed) throw new InvalidOperationException( "Important Property cannot be changed unless This is closed."); if (ImportantProperty == value) return; _importantProperty = value; OnImportantPropertyChanged(new EventArgs()); } } Unfortunately, I can't find anything that will act like [DebuggerStepThrough(false)] and I must resort to turning off property step-over and putting [DebuggerStepThrough] everywhere I don't want to step-through.

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  • DI: Injecting ActionFilterAttribute implementation (ASP.NET MVC)

    - by Sosh
    I was wondering if it is possible to inject a particular ActionFilterAttribute implementation using a IoC container. For example, imagine you create a TransactionAttribute class [Transaction] You use this to decorate action which should be wrapped in a transaction in the persistence layer. But implementation details of the attribute will be tied to the persistence tech you are using, but strictly speaking, your controller should not know about this, and you might want to swap this out. What I would like to do, is define some kind of TransactionAttribute interface, and then have my IoC inject the correct implantation. So on my actions I only need specify: [Transaction] public ActionResult SomeAction() { .... } ...and the IoC will inject the correct implementation depending on config (eg. something like NHibernateTransactionAttribute, or SomeOtherORMTransactionAttribute). Is this possible? Has anyone done it?

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  • R: getting a function name as a string

    - by HamiltonUlmer
    Say I have a bunch of functions, each with something likeMyFunction.1, etc. I want to pass these functions into another function, which prints out a small report. Ideally I'd like to be able to label sections of a report by which function is being used to generate the results. So are there any nice ways of getting the name of a predefined function as a string?

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  • Defining xml in an xsd where an attribute determines the possible contents

    - by SeanJA
    How would one go about defining something like this in an xsd? <start> <request type="typeA"> <elementOnlyFoundInA /> </request> <request type="typeB"> <elementOnlyFoundInB /> </request> </start> I ran xsd.exe just to get an idea of what it might look like, but it does not appear recognize the relationships between the value of type and the contents of the request. Is it even possible to define contents based on an attribute like this in an xsd file?

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  • jquery: .attr() fails for child element

    - by user984003
    I'm going crazy staring at this. I need to change the attribute of an element, something which I have done many times before. But it fails. Now I can't even get jquery to show me the attribute that it has. Does it have to do with what is returned by find()? var c = new_photo_div.find('[class = photo]')[0]; alert(c); alert(new_photo_div.attr('class')); alert(c.attr('class')); The first alert correctly identifies the element: Object HTMLImageElement The second alert correctly gives me the class of new_photo_div. The third alert fails. No alert. I think it should say: photo

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  • jQuery function only inside a specific div ID

    - by user412481
    I have the following function that I only want to run inside a specific div with the id of imgWrapper. I have tried a few things with parent but I cannot seem to figure this out. <script type="text/javascript" language="javascript"> $(document).ready( function () { $("img").each(function () { var src = $(this).attr("src"); if (src.substring(0, 1) == "/") $(this).attr("src", "http://serverName.com/" + src.substring(1)) }); } ); </script>

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  • start function from another tab in UIWebView

    - by Marjan
    Hello, I have app which have two views implemented in Tabbar, one of them is UIWebView which shows some random html and second is mapView (route-me map), I have function in MapViewController.m which do sth stuff when is clicked on marker label - (void) tapOnLabelForMarker: (RMMarker*) marker onMap: (RMMapView*) map { NSLog(@"taponlabelformarker clicked"); self.tabBarController.selectedIndex=0; WebViewController *web = [[WebViewController alloc] init]; [web dajdasepije]; } and that function should call function which show html in uiwebview tab -(void)dajdasepije { NSLog(@" pokreni me njezno"); [webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.google.com"]]]; } Problem is that UIWebView never show google page that I asked for it, NSLog prints out at terminal messages that function was called but nothing else happens. Please help, Thanks in advance. Marjan

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  • How Can I Implement This In Java?

    - by davit-datuashvili
    first of all i am doing programs in java language this code is merely taken from web site i have not question about divide and conqurer algorithms but about function and it's argument here is code of ternary search def ternarySearch(f, left, right, absolutePrecision): #left and right are the current bounds; the maximum is between them if (right - left) < absolutePrecision: return (left + right)/2 leftThird = (2*left + right)/3 rightThird = (left + 2*right)/3 if f(leftThird) < f(rightThird): return ternarySearch(f, leftThird, right, absolutePrecision) return ternarySearch(f, left, rightThird, absolutePrecision) i am not asking once again how implement it in java i am asking for example how define function?for example let y=x^+3 yes we can determine it as public static int y(int x){ return x*x+3; } but here return ternarySearch(f, leftThird, right, absolutePrecision) function f does not have argument and how do such?please help me

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  • Checkbox - in Javascript

    - by smiley
    I am working on Edit screen where I am pulling out value from db to check if the checkbox is checked or not. If it is unchecked, it should deselect the checkbox and other controls of this checkbox. In my case the js works perfectly fine. That is if my previous screen has checkbox unchecked, edit screen disables all the values for this checkbox. But it still shows the checkbox is checked in UI(though it is actually checked). Something is wrong with my html code. Can someone please let me know where /how should i modify to display if my checkbox is unchecked? <%chkStatus=list.getCheckbox(); if (chkStatus == null) { chkStatus = ""; } %> <input id="chkbox" type="checkbox" name="chkbox" checked="<%=chkStatus%>" onchange="javascript:enableDisableTextBox();">

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  • SCons and dependencies for python function generating source

    - by elmo
    I have an input file data, a python function parse and a template. What I am trying to do is use parse function to get dictionary out of data and use that to replace fields in template. Now to make this a bit more generic (I perform the same action in few places) I have defined a custom function to do so. Below is definition of custom builder and values is a dictionary with { 'name': (data_file, parse_function) } (you don't really need to read through this, I simply put it here for completeness). def TOOL_ADD_FILL_TEMPLATE(env): def FillTemplate(env, output, template, values): out = output[0] subs = {} for name, (node, process) in values.iteritems(): def Process(env, target, source): with open( env.GetBuildPath(target[0]), 'w') as out: out.write( process( source[0] ) ) builder = env.Builder( action = Process ) subs[name] = builder( env, env.GetBuildPath(output[0])+'_'+name+'_processed.cpp', node )[0] def Fill(env, target, source): values = dict( (name, n.get_contents()) for name, n in subs.iteritems() ) contents = template[0].get_contents().format( **values ) open( env.GetBuildPath(target[0]), 'w').write( contents ) builder = env.Builder( action = Fill ) builder( env, output[0], template + subs.values() ) return output env.Append(BUILDERS = {'FillTemplate': FillTemplate}) It works fine when it comes to checking if data or template changed. If it did it rebuilds the output. It even works if I edit process function directly. However if my process function looks like this: def process( node ): return subprocess(node) and I edit subprocess the change goes unnoticed. Is there any way to get correct builds without making process functions being always invoked?

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  • ASP.NET MVC2 - Trim white space from form submits before server-side validation?

    - by David Lively
    If I add a validation attribute: public class ProductDownloadListModel { //xxxxx-xxxxx-xxxxx [Required] [StringLength(17)] public string PSN { get; set; } public DateTime PsnExpirationDate { get; set; } public DataTable Downloads { get; set; } } and the user enters a 17-character string but includes white space on the end, I get a validation error because the string is greater than that specified by the [StringLength(17)] attribute. How can I prevent this? I'd prefer not to have to have javaScript trim the string before submits.

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  • Alt attribute encoding with JavaScript

    - by MainMa
    Hi, Html entities must be encoded in alt attribute of an image in HTML page. So <img id="formula" alt="A &rarr; B" src="formula.png" /> will work well. On the other hand, the same JavaScript code will not work document.getElementById('formula').alt = 'A &rarr; B'; and will produce A &rarr; B instead of A → B. How to do it through JavaScript, when it is not possible to put the special (unencoded) characters in the source code?

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  • how am I supposed to call the function?

    - by user1816768
    I wrote a program which tells you knight's movement (chess). For example if I wanted to know all possible moves, I'd input: possibilites("F4") and I'd get ['D3', 'D5', 'E2', 'E6', 'G2', 'G6', 'H3', 'H5'] as a result, ok I did that, next, I had to write a function in which you input two fields and if those fields are legal, you'd get True and if they're not you'd get False(I had to use the previous function). For example: legal("F4","D3") >>>True code: def legal(field1,field2): c=possibilities(field1) if field1 and field2 in a: return True return False I'm having a problem with the following function which I have to write: I have to put in path of the knight and my function has to tell me if it's legal path, I'm obliged to use the previous function. for example: >>> legal_way(["F3", "E1", "G2", "H4", "F5"]) True >>> legal_way(["F3", "E1", "G3", "H5"]) False >>> legal_way(["B4"]) True I know I have to loop through the list and put first and second item on it in legal(field1,field2) and if it's false, everything is false, but if it's true I have to continue to the end, and this has to work also if I have only one field. I'm stuck, what to do? def legal_way(way): a=len(way) for i in range(0,a-2): if a==1: return true else if legal(way[i],way[i+1]: return True return False and I get True or index out of range

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  • Collision free hash function for a specific data structure

    - by Max
    Is it possible to create collision free hash function for a data structure with specific properties. The datastructure is int[][][] It contains no duplicates The range of integers that are contained in it is defined. Let's say it's 0..1000, the maximal integer is definitely not greater than 10000. Big problem is that this hash function should also be very fast. Is there a way to create such a hash function? Maybe at run time depending on the integer range?

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  • update variable after success of ajax function

    - by Scarface
    Hey guys quick question, I am sending a request with the jquery ajax function with a variable. After the request I want that variable updated to match the value of the sent back information, so next time the ajax function executes, it send the value of the new variable. $.ajax({ type: "POST", data: "countusers=" + countusers, url: "tester.php", dataType: 'json', success: function(json) { var countusers=json.rownumber; } } })

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  • What is [assembly: InternalsVisibleTo("MyAssembly")]? A statement, directive, ...?

    - by Alix
    Hi. Sorry about the vocabulary question but I can't find this anywhere: how do you call this below? [assembly: System.Runtime.CompilerServices.InternalsVisibleTo("MyAssembly")] Is it a statement, a directive, ... ? I want to indicate that you have to insert that line in order to give MyAssembly access to your assembly's internal members, but I'd like to use a more specific term than "line". Thanks!

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  • restricting the property type of a custom attribute

    - by Guy
    Does anyone knows if it is possible to define/declare on your own custom attribute a restriction to the field type it may apply on? There are a flags that do restrict the usage of the attribute: [AttributeUsage( AttributeTargets.Property, AllowMultiple = false)] Im looking for something like: UseOnlyOnType = typeof(string) Any ideas?

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  • Trying to make a reusable function and display the result in a div

    - by user3709033
    I have this function that I am trying to work with. All I am trying to do is to get the values of days, hours, min and sec into the .overTime div. I want to use the same function over and over again because i have more divs in which I want to display the same values but in a diff manner. You guys are awesome Thank You. NowTime = new Date(); //Time Now StartTime = new Date($('#StartTime').val()); StopTime = new Date($('#StopTime').val()); function fixIntegers(integer){ if (integer < 0) integer = 0; if (integer < 10) return '0' + integer; return '' + integer; } function Test( difference ) { var toReturn = { days: 0, hours: 0, minutes: 0, seconds: 0 }; toReturn.seconds = fixIntegers(difference % 60); difference = Math.floor(difference / 60); toReturn.minutes = fixIntegers(difference % 60); difference = Math.floor(difference / 60); toReturn.hours = fixIntegers(difference % 24); difference = Math.floor(difference / 24); toReturn.days = fixIntegers(difference); return toReturn; } function run() { var output = Test( Math.floor( ( NowTime - StopTime ) / 1000 ) ); $('.OverTime').html( output.days + ':' + output.hours + ':' + output.minutes + ':' + seconds); } setInterval(run, 1000) FIDDLE: http://jsfiddle.net/8943U/47/

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