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  • R: How to separate character output in a loop?

    - by John
    I'm blanking on the best way to paste a list of strings together to go into an SQL statement... I'm having trouble with the separator bar | printing at the beginning when I don't want it to: foo = "blah" paste_all_together = NULL for (n in 1:4) { paste_together = paste(foo ,sep = "") paste_all_together = paste(paste_all_together, paste_together, sep = "|") } > paste_all_together [1] "|blah|blah|blah|blah" I just want it to print out "blah|blah|blah|blah". Do I need a nested loop, or is there a better itterator in R for doing this? Or perhaps a better way to input SQL statements?

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  • Using generic type from other generic parameter

    - by DEHAAS
    Hi, I have a question about .net generics. Consider the following code: public class Test<TKey> { TKey Key { get; set; } } public class Wrapper<TValue, TKey> where TValue : Test<TKey> { public TValue Value { get; set; } } Now, when using this code, I could do something like this: Wrapper<Test<int>, int> wrapper = new Wrapper<Test<int>, int>(); The int type parameter has to be provided twice. Is it possible to modify the Wrapper definition, to require TValue to be a generic type, and use this 'nested' generic type parameter insted of the TKey type parameter?

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  • Javascript object encapsulation that tracks changes

    - by Raynos
    Is it possible to create an object container where changes can be tracked Said object is a complex nested object of data. (compliant with JSON). The wrapper allows you to get the object, and save changes, without specifically stating what the changes are Does there exist a design pattern for this kind of encapsulation Deep cloning is not an option since I'm trying to write a wrapper like this to avoid doing just that. The solution of serialization should only be considered if there are no other solutions. An example of use would be var foo = state.get(); // change state state.update(); // or state.save(); client.tell(state.recentChange()); A jsfiddle snippet might help : http://jsfiddle.net/Raynos/kzKEp/ It seems like implementing an internal hash to keep track of changes is the best option. [Edit] To clarify this is actaully done on node.js on the server. The only thing that changes is that the solution can be specific to the V8 implementation.

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  • How to access a method of a closure's parent object?

    - by Bytecode Ninja
    I have defined a class named MyClass and I have defined two methods myMethod1 and myMethod2 for it: function MyClass() {} MyClass.prototype.myMethod1 = function() {...}; MyClass.prototype.myMethod2 = function() {...}; Inside myMethod1, I use jQuery and there's a callback closure defined there: MyClass.prototype.myMethod2 = function() { $.jQuery({success: function(data) { this.myMethod2(); }, ...}); } Now the problem is that this no longer is referring to MyClass. The question is how can I refer to it? At the moment I have assigned it to a variable named thisObj and access it this way: MyClass.prototype.myMethod2 = function() { var thisObj = this; $.jQuery({success: function(data) { thisObj.myMethod2(); }, ...}); } Is there a better way to access MyClass.this from the closure nested in myMethod2? Thanks in advance.

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  • ASP.Net website makes browser load unwanted (non-referenced) plugins

    - by alec0001
    I've found that some of my ASP.Net web apps prompt the browser to load plugins that I'm not explicitely using and certainly haven't deliberately referenced in the project settings. Two that come to mind are for MS MediaPlayer and the "SVG Viewer for Netscape". The only commonality I've determined so far is that the two sites/apps affected both use Master pages (nested in some cases). We don't use SVG file types (just the normal mix of jpg/gif/png) and no video/audio (not yet anyway). Can anyone provide a hint as to where the references for these might be creeping in? e.g. Is it a server-level include? Or a .Net runtime default when using master pages? Does anyone else even experience this, or is it just me? No urgency, I'd just like to remove it if possible. Thanks. Al

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  • Running a sharded DB from a single machine

    - by ming yeow
    This sounds kinda dumb, but I have a sharded DB that I no longer think I need to run on 2 machines, and would like to run on one single machine instead. Any ideas on how that can potentially be done? There are lots of resources on how i can achieve the converse, but very little on how this can be done

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  • How to define a custom iterator in C++

    - by Robert Martin
    I've seen a number of posts on SO about how to define custom iterators, but nothing that seems to exactly answers my question, which is... How do I create an iterator that hides a nested for loop? For instance, I have a class Foo, inside of the Foo is a Bar, and inside of the Bar is a string. I could write for (const Foo& foo : foo_set) for (const Bar& bar : foo.bar_set) if (bar.my_string != "baz") cout << bar.my_string << endl; but instead I want to be able to do something like: for (const string& good : foo_set) cout << good << endl; How do I do something like this?

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  • Find node level in a tree

    - by Álvaro G. Vicario
    I have a tree (nested categories) stored as follows: CREATE TABLE `category` ( `category_id` int(10) unsigned NOT NULL AUTO_INCREMENT, `category_name` varchar(100) NOT NULL, `parent_id` int(10) unsigned DEFAULT NULL, PRIMARY KEY (`category_id`), UNIQUE KEY `category_name_UNIQUE` (`category_name`,`parent_id`), KEY `fk_category_category1` (`parent_id`,`category_id`), CONSTRAINT `fk_category_category1` FOREIGN KEY (`parent_id`) REFERENCES `category` (`category_id`) ON DELETE SET NULL ON UPDATE CASCADE ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_spanish_ci I need to feed my client-side language (PHP) with node information (child+parent) so it can build the tree in memory. I can tweak my PHP code but I think the operation would be way simpler if I could just retrieve the rows in such an order that all parents come before their children. I could do that if I knew the level for each node: SELECT category_id, category_name, parent_id FROM category ORDER BY level -- No `level` column so far :( Can you think of a way (view, stored routine or whatever...) to calculate the node level? I guess it's okay if it's not real-time and I need to recalculate it on node modification.

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  • Lambda Expressions for a 5th Grader

    - by Randy Minder
    If you had to explain Lambda expressions to a 5th grader, how would you do it? And what examples might you give, or resources might you point them to? I may be finding myself in the position of having to teach this to 5th grade level developers and could use some assistance. Thanks very much.

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  • best way to update client site data in GWT application

    - by bmscomp
    When getting data from the server to the client side in GWT application we need to refresh every period of time to get updates for data, I think this is not a good method because if consume lot of time and resources, just thinking about another method is amazing :), any one get a good and effeciant idea ??

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  • Is a selector like *+* safe to use?

    - by mcmullins
    I recently came across this CSS selector while trying to find a way to easily space out major blog elements such as paragraphs and images. An example of its use would be something like this: .post *+* {margin-top: 15px;} /* or... */ .post > *+* {margin-top: 15px;} /* if you don't want the margin to apply to nested elements */ At first glance, it seemed pretty useful. So my question is: What downsides are there to using these selectors? Specifically: What's the browser support like for this? Are there any cases you wouldn't want an even margin spacing between elements in an article and if not, is it easier to declare this first and then overwrite or simply declare each element individually? Does this have performance issues since you're selecting everything twice?

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  • Datagrid binding 2 datafiled under one column along with an image?

    - by prince23
    hi, here i am performing nested grid operation where in my first datagrid . have name,age,address once user clicks the row we will be showing another grid that is with data Subject name and Score untill here the functionality works fine . 1:now the Question is that i should be displaying an image along with score in the same column( how can i achive this one) 2:Depending on the score i need to show an image( binding different image based on score) 1 :that is if score is 20 show ( ~images/image1.jpg) 2 :that is if score is 40 show ( ~images/image2.jpg) 3 :that is if score is 20 show (~images/ image3.jpg) output [ in a grid format] subject score science 45 image3 maths 50 image2 Computer 60 image1 general 78 image1 how do we solve this issue . any idea how to go ahead. please let me know. hope my question is clear thanks in advance prince

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  • How to replicate data with memcache

    - by Industrial
    Hi everyone, I am trying to find good resources on best practices to data replication across memcache servers. What I want to accomplish is that if one of my servers in my pool goes down, the next server in line already has the info set. I have found "repcached" but since I run a WIN32 test environment, I have been unable to install it. So what's our alternatives on how to replicate data between servers? Thanks,

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  • How can I find all the trunks from several different Subversion servers?

    - by SylanderXS
    We have many SVN Repo's but many of them have nested projects. I need some way of finding the trunk directories only and creating a list of them. So, the svn path to trunk might be svn://svnserver/repos/myproject/trunk or it might be svn://svnserver/repos/myproject/mysubproject/trunk I need to generate a list of /trunk directories from several different servers. Is there a method for doing that? Has anyone seen a script (sh, perl, whatever) for doing something similar? I just need a hint on how to get started.

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  • Problem with plugin - Zend Framework

    - by david
    Hello friends, I have this problem with a plugin in zend framework. I've created on this route: library/Mis/Plugins/Unpluginmas.php in application.ini autoloaderNamespaces[] = "Mis_" resources.frontController.plugins.Unpluginmas = "Mis_Plugins_Unpluginmas" Unpluginmas.php class Mis_Plugins_Unpluginmas extends Zend_Controller_Plugin_Abstract{ Zend Framework not find the plugin. I appreciate if you can help me because I can't find the problem.

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  • Is there a way to load multiple app.configs in memory?

    - by Dave
    I have a windows service that loads multiple "handlers" written by different developers. The windows service exe has it's own app.config which I need. I'm trying to make it so that each developer can provide their own app.config along with their handler code. However, it seems an exe can only have one app.config. However, ASP.NET seems to support nested web.config... That's not exactly what I want, but I don't even know how I would get that to work in a windows service. Anyone come across this before or have any ideas?

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  • In Perl, how can I iterate over the Cartesian product of multiple sets?

    - by nubie2
    I want to do permutation in Perl. For example I have three arrays: ["big", "tiny", "small"] and then I have ["red", "yellow", "green"] and also ["apple", "pear", "banana"]. How do I get: ["big", "red", "apple"] ["big", "red", "pear"] ..etc.. ["small", "green", "banana"] I understand this is called permutation. But I am not sure how to do it. Also I don't know how many arrays I can have. There may be three or four, so I don't want to do nested loop.

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  • Should I convert data arrays to objects in PHP in a CouchDB/Ajax app?

    - by karlthorwald
    I find myself converting between array and object all the time in PHP application that uses couchDB and Ajax. Of course I am also converting objects to JSON and back (for sometimes couchdb but mostly Ajax), but this is not so much disturbing my workflow. At the present I have php objects that are returned by the CouchDB modules I use and on the other hand I have the old habbit to return arrays like array("error"="not found","data"=$dataObj) from my functions. This leads to a mixed occurence of real php objects and nested arrays and I cast with (object) or (array) if necessary. The worst thing is that I know more or less by heart what a function returns, but not what type (array or object), so I often run into type errors. My plan is now to always cast arrays to objects before returning from a function. Of course this implies a lot of refactoring. Is this the right way to go? What about the conversion overhead? Other ideas or tips?

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  • int i vs int index etc. Which one is better?

    - by Earlz
    Coming from a C background I've always used int i for generic loop variables. Of course in big nested loops or other complex things I may use a descriptive name but which one had you rather see? int i; for(i=0;i<Controls.Count;i++){ DoStuff(Controls[i]); } or int index; for(index=0;index<Controls.Count;index++){ DoStuff(Controls[index]); } In the current project I am working on there are both of these styles and index being replaced by ndx. Which one is better? Is the i variable too generic? Also what about the other C style names? i, j, k Should all of these be replaced by actual descriptive variables?

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  • What is the most efficient approach to fetch category tree, products, brands, counts by subcategory

    - by alex227
    Symfony 1.4 + Doctrine 1.2. What is the best way to minimize the number of queries to retrieve products, subcategories of current category, product counts by subcategory and brand for the result set of the query below? Categories are a nested set. Here is my query: $q = Doctrine_Query::create() ->select('c.*, p.product,p.price, b.brand') ->from('Category c') ->leftJoin('c.Product p') ->leftJoin('p.Brand b') ->where ('c.root_id = ?', $this->category->getRootId()) ->andWhere('c.lft >= ?', $this->category->getLft()) ->andWhere('c.rgt <= ?', $this->category->getRgt()) ->setHydrationMode(Doctrine_Core::HYDRATE_ARRAY); $treeObject = Doctrine::getTable('Category')->getTree(); $treeObject->setBaseQuery($q); $this->treeObject = $treeObject; $treeObject->resetBaseQuery(); $this->products = $q->execute();

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  • WPF: Set style on immediate children only

    - by ollifant
    In my application I have a tab control which has several tab items. The problem is that I want to apply a style to these tab items, but to no other (nested) tab items. I have tried setting the following style on the tab control, but this also effects all children: <Style x:Key="tabControlStyle" TargetType="{x:Type TabControl}"> <Setter Property="TabItem.Template" Value="{StaticResource tabItemTemplate}" /> </Style> By using the code above I get the following error: 'TabItem' ControlTemplate TargetType does not match templated type 'TabControl', as TabItem and TabControl have the same DependencyProperty "Template", and the code tries to set the TabItemTemplate as TabControl- Template. Can anybody help me?

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  • How to set size for divs with different parents

    - by user340524
    I want to create a div layout which is similiar to the following table result: <html> <head> <title>Basic</title> <style> table { border: 1px solid;} </style> </head> <body> <table style="border: 1px solid;"> <tr> <td> Asia</td> <td> <table> <tr> <td>South Asia</td> </td> <td><table> <tr> <td>Republic</td> <td><table> <tr><td>Singapore</td></tr> <tr><td>India</td></tr> </table></td> </tr> <tr> <td>Monarchy</td> <td><table> <tr><td>Bhutan</td></tr> <tr><td>Nepal</td></tr> </table></td> </tr> </table></td> </tr> <tr> <td>East Asia</td> <td><table> <tr> <td>Republic</td> <td><table> <tr><td>China</td></tr> <tr><td>South Corea</td></tr> </table></td> </tr> <tr> <td>Constitutional Monarchy</td> <td><table> <tr><td>something</td></tr> <tr><td>Japan</td></tr> </table></td> </tr> </table></td> </tr> </table></td> </tr> </table> </body> </html> I managed to replicate this with some effort. The problem is that I want the names of the countries to be in a column or if you will - the containers for the government types to be the same width so other containers will align. If I don't do it in nested containers (in the example - nested tables) the rows will get displaced. Currently rows are shown exactly how I want them - the text is in the vertical middle of the what they refer to. Only thing that comes up to my mind is to set the text in the same columns as class=column1, class=column2, etc. and then somehow define the width for the column classes. Problem is the data is defined dynamically and I can't say how much pixels or % of the page I can give to a column, I just need it to stretch with the text. This is my first time I ask about help here so if I am doing it wrong, tell me how do improve my inquiry.

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