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  • How to use R's ellipsis feature when writing your own function?

    - by Ryan Thompson
    The R language has a nifty feature for defining functions that can take a variable number of arguments. For example, the function data.frame takes any number of arguments, and each argument becomes the data for a column in the resulting data table. Example usage: > data.frame(letters=c("a", "b", "c"), numbers=c(1,2,3), notes=c("do", "re", "mi")) letters numbers notes 1 a 1 do 2 b 2 re 3 c 3 mi The function's signature includes an ellipsis, like this: function (..., row.names = NULL, check.rows = FALSE, check.names = TRUE, stringsAsFactors = default.stringsAsFactors()) { [FUNCTION DEFINITION HERE] } I would like to write a function that does something similar, taking multiple values and consolidating them into a single return value (as well as doing some other processing). In order to do this, I need to figure out how to "unpack" the ... from the function's arguments within the function. I don't know how to do this. The relevant line in the function definition of data.frame is object <- as.list(substitute(list(...)))[-1L], which I can't make any sense of. So how can I convert the ellipsis from the function's signature into, for example, a list? To be more specific, how can I write get_list_from_ellipsis in the code below? my_ellipsis_function(...) { input_list <- get.list.from.ellipsis(...) output_list <- lapply(X=input_list, FUN=do_something_interesting) return(output_list) } my_ellipsis_function(a=1:10,b=11:20,c=21:30)

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  • Blogger Code Image linking to post page

    - by Jm Agas
    Is this possible to achieve in blogger? My goal is to make Static page images to become clickable and link it to the actual post page. I know its possible by editing each post but I want to make it automatic. For example: In 9gag.com when you click the image from the homepage it will actually link you to the post page. I want to do the same but in blogger. Something like this <b:if cond='data:blog.pageType != &quot;static_page&quot;'><a expr:href='data:post.url'><static page images></a></b:if> Screenshot: http://i.stack.imgur.com/YAWkL.jpg

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  • Pass parameter one time, but use more times

    - by Gabriel L. Oliveira
    I'm trying to do this: commands = { 'py': 'python %s', 'md': 'markdown "%s" "%s.html"; gnome-open "%s.html"', } commands['md'] % 'file.md' But like you see, the commmands['md'] uses the parameter 3 times, but the commands['py'] just use once. How can I repeat the parameter without changing the last line (so, just passing the parameter one time?)

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  • ObjectiveC - Releasing objects added as parameters

    - by NobleK
    Ok, here goes. Being a Java developer I'm still struggling with the memory management in ObjectiveC. I have all the basics covered, but once in a while I encounter a challenge. What I want to do is something which in Java would look like this: MyObject myObject = new MyObject(new MyParameterObject()); The constructor of MyObject class takes a parameter of type MyParameterObject which I initiate on-the-fly. In ObjectiveC I tried to do this using following code: MyObject *myObject = [[MyObject alloc] init:[[MyParameterObject alloc] init]]; However, running the Build and Analyze tool this gives me a "Potential leak of an object" warning for the MyParameter object which indeed occurs when I test it using Instruments. I do understand why this happens since I am taking ownership of the object with the alloc method and not relinquishing it, I just don't know the correct way of doing it. I tried using MyObject *myObject = [[MyObject alloc] init:[[[MyParameterObject alloc] init] autorelease]]; but then the Analyze tool told me that "Object sent -autorelease too many times". I could solve the issue by modifying the init method of MyParameterObject to say return [self autorelease]; in stead of just return self;. Analyze still warnes about a potential leak, but it doesn't actually occur. However I believe that this approach violates the convention for managing memory in ObjectiveC and I really want to do it the right way. Thanx in advance.

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  • java.sql.SQLException: Parameter index out of range (3 > number of parameters, which is 2)

    - by sam
    @WebMethod(operationName = "SearchOR") public SearchOR getSearchOR (@WebParam(name = "comp") String comp, @WebParam(name = "name") String name) { //TODO write your implementation code here: SearchOR ack = null; try{ String simpleProc = "{ call getuser_info_or(?,?)}"; CallableStatement cs = con.prepareCall(simpleProc); cs.setString(1, comp); cs.setString(2, name); ResultSet rs = cs.executeQuery(); System.out.print("2"); /* int i = 0, j = 0; if (rs.last()) { i = rs.getRow(); ack = new SearchOR[i]; rs.beforeFirst(); }*/ while (rs.next()) { // ack[j] = new SearchOR(rs.getString(1), rs.getString(2)); // j++; ve.add(rs.getString(1)); ve.add(rs.getString(2)); }}catch ( Exception e) { e.printStackTrace(); System.out.print(e); } return ack; } I am getting error at portion i have made bold.It is pointing to that location.My Query is here: DELIMITER $$ DROP PROCEDURE IF EXISTS discoverdb.getuser_info_or$$ MySQL returned an empty result set (i.e. zero rows). CREATE PROCEDURE discoverdb.getuser_info_or ( IN comp VARCHAR(100), IN name VARCHAR(100), OUT Login VARCHAR(100), OUT email VARCHAR(100) ) BEGIN SELECT sLogin, sEmail INTO Login, email FROM ad_user WHERE company = comp OR sName=name; END $$ MySQL returned an empty result set (i.e. zero rows). DELIMITER ;

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  • locate label on content page

    - by VictorS
    I am trying to locate a label on a content page from within User Control(ascx) Page p = this.Page; //this line causes application to unload with no exception ContentPlaceHolder cp = (ContentPlaceHolder)p.Master.FindControl("Content2"); Label label = (Label)cp.FindControl("SomeLabel"); It just unloads itself with no exception mesage. Why does it happen?

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  • Mongodb querying for multiple parameters

    - by gaggina
    I've this collections { "name" : "montalto", "users" : [ { "username" : "ciccio", "email" : "aaaaaaaa", "password" : "aaaaaaaa", "money" : 0 } ], "numers" : "8", "_id" : ObjectId("5040d3fded299bf03a000002") } If I want to search for a collection with the name of montalto and a user named ciccio I'm using the following query: db.coll.find({name:'montalto', users:{username:'ciccio'}}).count() But it does not work. Where I went wrong?

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  • How to do jquery code AFTER page loading?

    - by Alex
    If you want an event to work on your page, you should call it inside the $(document).ready() function. Everything inside it will load as soon as the DOM is loaded and before the page contents are loaded. I want to do javascript code only after the page contents are loaded how can I do that?

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  • validate constructor arguments or method parameters with annotations, and let them throw an exceptio

    - by marius
    I am validating constructor and method arguments, as I want to the software, especially the model part of it, to fail fast. As a result, constructor code often looks like this public MyModelClass(String arg1, String arg2, OtherModelClass otherModelInstance) { if(arg1 == null) { throw new IllegalArgumentsException("arg1 must not be null"); } // further validation of constraints... // actual constructor code... } Is there a way to do that with an annotation driven approach? Something like: public MyModelClass(@NotNull(raise=IllegalArgumentException.class, message="arg1 must not be null") String arg1, @NotNull(raise=IllegalArgumentException.class) String arg2, OtherModelClass otherModelInstance) { // actual constructor code... } In my eyes this would make the actual code a lot more readable. In understand that there are annotations in order to support IDE validation (like the existing @NotNull annotation). Thank you very much for your help.

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  • pass ...rest to a NetConnection call

    - by dome
    I want to pass a rest in a netconnection call, something like this: public function requestData(service : String, ...params) : void { nc.call(service, params); } this doesn't work since the call is expecting each parameter to be separated by commas, like: nc.call(service, params[0], params[1], params[2]); I've read some posts about apply, but I can't find a solution for this specific case.

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  • Python: Pass parameter one time, but use more times

    - by Gabriel L. Oliveira
    I'm trying to do this: commands = { 'py': 'python %s', 'md': 'markdown "%s" "%s.html"; gnome-open "%s.html"', } commands['md'] % 'file.md' But like you see, the commmands['md'] uses the parameter 3 times, but the commands['py'] just use once. How can I repeat the parameter without changing the last line (so, just passing the parameter one time?)

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  • Adding Silverlight pages to existing ASP.net page??

    - by AJ
    Hi I know how to add SL page as a whole to existing ASP.net application. We have existing ASP.net page with few tabs. Each tab is a user control. We want to add another tab, which will host Silverlight content. Is it possible to add silverlight content in one of the tabs of a page? Any example links? Another way of putting up the same question : Is it possible to have an ASP.net page with top half as regular asp.net content and other half containing silverlight content? Please advise. Thanks AJ

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  • jasper grails parameters

    I have jasper report which accepts Integer parameter . I am using g:jasperreport tag to call the report . body of this tag has input html which gets passed to report. But's the report is not working. It is giving invalid format exception. Pl. help Thanks in advance. Abe

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  • Appending javascript script to end of page

    - by uzay95
    I am looking for a way to insert javascript code block to end of ASP.NET page. Page.ClientScript.RegisterClientScriptBlock(typeof(Page), "videoyuGoster", sScript, true); is appending to body but js codes are always requesting some js files didn't load or some functions are below of the script. How can i append scripts that i generated dynamically to the bottom of body? Thanks for your help.

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  • passing url in parameters mvc4

    - by user516883
    I have a site that collects urls. A full http url is enter into a texbox. I am getting a 400 error when a url is being passed in the parameter, It works fine with regular text. Using jquery how can I pass the full URL in my application. Thanks for any help. MVC Routing Config routes.MapRoute("UploadLinks", "media/upload_links/{link}/{albumID}", new { controller = "Media", action = "WebLinkUpload" }); Controller Action public ActionResult WebLinkUpload(string link, string albumID){} Jquery ajax call $('#btnUploadWebUpload').click(function () { $.ajax({ type: "GET", url: "/media/upload_links/" + encodeURIComponent($('#txtWebUrl').val().trim()) + "/" + currentAlbumID, contentType: "application/json; charset=utf-8", dataType: "json", success: function (result) { } }); });

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  • Specify More "case" in switch parameters

    - by Sophie Mackeral
    I have the following code: $ErrorType = null; switch ($ErrNo){ case 256,1: $ErrorType = "Error"; break; case 512,2: $ErrorType = "Warning"; break; case 1024,8: $ErrorType = "Notice"; break; case 2048: $ErrorType = "Strict Warning"; break; case 8192: $ErrorType = "Depreciated"; break; } But the problem is, I'm going from the pre-defined constants for an error handling software solution.. I cannot specify more than one "case" for the dedicated error categories, example: switch ($ErrNo){ case 1: $ErrorType = "Error"; break; case 256: $ErrorType = "Error"; } That's a repeat of code.. Whereas with a solution like my first example, it would be beneficial as two integers fall under the same category.. Instead, i'm returned with the following: Parse error: syntax error, unexpected ',' in Action_Error.php on line 37

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  • Ruby: Parse, replace, and evaluate a string formula

    - by Swartz
    I'm creating a simple Ruby on Rails survey application for a friend's psychological survey project. So we have surveys, each survey has a bunch of questions, and each question has one of the options participants can choose from. Nothing exciting. One of the interesting aspects is that each answer option has a score value associated with it. And so for each survey a total score needs to be calculated based on these values. Now my idea is instead of hard-coding calculations is to allow user add a formula by which the total survey score will be calculated. Example formulas: "Q1 + Q2 + Q3" "(Q1 + Q2 + Q3) / 3" "(10 - Q1) + Q2 + (Q3 * 2)" So just basic math (with some extra parenthesis for clarity). The idea is to keep the formulas very simple such that anyone with basic math can enter them without resolving to some fancy syntax. My idea is to take any given formula and replace placeholders such as Q1, Q2, etc with the score values based on what the participant chooses. And then eval() the newly formed string. Something like this: f = "(Q1 + Q2 + Q3) / 2" # some crazy formula for this survey values = {:Q1 => 1, :Q2 => 2, :Q3 => 2} # values for substitution result = f.gsub(/(Q\d+)/) {|m| values[$1.to_sym] } # string to be eval()-ed eval(result) So my questions are: Is there a better way to do this? I'm open to any suggestions. How to handle formulas where not all placeholders were successfully replaced (e.g. one question wasn't answered)? Ex: {:Q3 = 2} wasn't in values hash? My idea is to rescue eval()... any thoughts? How to get proper result? Should be 2.5, but due to integer arithmetic, it will truncate to 2. I can't expect people who provide the correct formula (e.g. / 2.0 ) to understand this nuance. I do not expect this, but how to best protect eval() from abuse (e.g. bad formula, manipulated values coming in)? Thank you!

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  • Asp: Building a master page?

    - by Poku
    Hey, Is it possible to build some kind of Master page with classic asp WITHOUT frames or iframes? Im thinking if there is a way to include content pages to the main page like in ASP.NET master pages. From what i have researched ASP classic does support include of ohter asp/html pages on a page, but the value put in to this include function can not be dynamic.

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  • Restful Path Parameters in Spring MVC 3

    - by MDK
    Is it possible to: set a URI template in the mvc:view-controller element of the *-servlet.xml file or in a controller method and then use/get that path parameter in a jsp? I understand that using @PathVariable in a controller method will give me access to the path parameter in that controller method. But how can I gain access to the path parameter in the jsp? For example, is it possible to do something like: *-servlet.xml file: <beans...> <mvc:view-controller path="/home" view-name="home"/> <mvc:view-controller path="/home/{error}" view-name="home"/> </beans> jsp file: <c:if test="${not empty param['error']}"> <span class="error">You have an error...</span> </c:if>

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  • press button to open web page from app

    - by Lee
    I have an app that I want to interact with a web page. Basically I want to press a button and the web page will open in a new view... Sorry I wasn't clear, I am developing on a Mac for an iPhone. Currently I have a "locate me" app that displays your Latitude and Longitude. I want to use those variables to populate 2 of the blanks on a PHP web page/form I have developed. I have added a label and button to my current app, when the button is pressed the URL with the Lat and Long (as passed vars) are displayed in the label. I want those vars to appear on my web page. Hope this is clearer... Solved: I just added these lines of code I found here: NSURL *url = [ [ NSURL alloc ] initWithString: @"http://www.cnn.com" ]; [[UIApplication sharedApplication] openURL:url];

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