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• Is there a work around for slow performance of do.call(cbind.xts,...) in R 2.15.2?

  - by Petr Matousu

  I would expect cbind.xts and do.call(cbind.xts) to perform with similar elapsed time. That was true for R2.11, R2.14. For R2.15.2 and xts 0.8-8, the do.call(cbind.xts,...) variant performs drastically slower, which effectively breaks my previous codes. As Josh Ulrich notes in a comment below, the xts package maintainers are aware of this problem. In the meantime, is there a convenient work around?

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• How can you access two identically-named columns in a MySQL LEFT JOIN query?

  - by George Edison

  I have two tables. table_x: id INT(11) tag INT(11) table_tags: id INT(11) name VARCHAR(255) Then I use PHP to perform the following query: SELECT * FROM table_x LEFT JOIN table_tags ON table_x.tag = table_tags.id The only problem is: how do I access table_x.id and table_tags.id in the results? Here is the PHP code: $query = "SELECT * FROM table_x LEFT JOIN table_tags ON table_x.tag = table_tags.id"; $results = mysql_query($query); while($row = mysql_fetch_array($results)) { // how do I now access table_x.id and table_tags.id ??? }

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• MySQLDump without locking the tables

  - by Raul Singahn

  It seems that if you have many tables, you can only perform a MySQLDump without locking them all, otherwise you can an error. What are the side effects of performing a MySQLDump without locking all the tables; Is the DB snapshot I get this way, consistent? Do I have any other alternative for getting a backup of a MySQL DB with many tables?

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• MySQL Math - Is it possible to calculate a correlation in a query?

  - by John M

  In a MySQL (5.1) database table there is data that represents: how long a user takes to perform a task and how many items the user handled during the task. Would MySQL support correlating the data or do I need to use PHP/C# to calcuate? Where would I find a good formula to calculate correlation (it's been a long time since I last did this)?

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• Simple Java to XML example

  - by Tom Brito

  I've read a time ago about generate xml from Java using annotations, but I'm not finding a simple example now. If I want to make a xml file like: <x:element uid="asdf">value</x:element> from my java class: public class Element { private String uid = "asdf"; } Which annotations I should use to perform that? (I have a xml-schema, if this helps the generation)

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• Smart Background Thread Task in Ruby on Rails?

  - by elado

  I need to perform a task every 5 seconds, but only when users are using the application. As for now, I use cron that works every minute and activates a task that repeats itself every 5 seconds with sleeps between, for a minute. However, it works also when the application isn't being used. Is there a gem that will do this kind of thing?

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• Looking for a reliable and efficient Java library for Formal Concept Analysis

  - by Uri

  I need to perform Formal Concept Analysis on the fly and am looking for an efficient SDK for calculating the concepts for a given context. There are a lot of research tools around but I'm looking for something supported and reliable. Any help would be appreciated

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• NSManagedObjectContext returns YES for hasChanges when there are none

  - by JK

  I created a separate NSManagedObjectContext on a separate thread to perform some store maintenance. However, I have noticed that the context returns YES for hasChanges as soon as a managed object in it is even referenced e.g. NSString *name = managedObject.name; This context is created and used exclusively in 1 method. Why is it returning has changes, when there there are none?

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• How do you make a private member in the base class become a public member in the base class?

  - by jasonline

  Consider the following code: class Base { void f() { } }; class Derived: public Base { public: }; What can you change in the derived class, such that you can perform the following: Derived d; d.f(); If the member is declared as public in the base class, adding a using declaration for Base::f in the derived class public section would've fix the problem. But if it is declared as private in the base class, this doesn't seem to work.

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• How can I know if an element is a direct child of the body using jQuery

  - by DanC

  I want to perform some action on elements that are not direct child of the body. How can I check a particular element to know whether its partent is the body. Thanks!

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• Show contents of the windows clipboard

  - by PsiX

  How can I see what the Windows clipboard currently contains without using the paste operation? I don't want the "pasted-to" application to perform any actions on the clipboard (e.g. formatting text, converting). Is there a tool which shows the clipboard's objects and their format (CF_BITMAP, CF_TEXT, etc.) and content (in simple bytes e.g.)?

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• Elegant min/max absolute values in java

  - by Stefano Borini

  I need to get the minimum and maximum values in a collection of floating point values, after applying an absolute value conversion. In python I would do this min(map(abs, [-5, -7, 10, 2])) how can I perform the same operation in java in the most elegant way?

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• SOA, unobtrusive JavaScript

  - by csetzkorn

  Hi, Let us say I have a restful web service which can deal with DTOs in json format to perform a CRUD operation. Let us also say I use jquery in an unobtrusive way to serialise my form at the frontend using: JSON.stringify What can I do to ensure that everything works even if JavaScript is switched off? Thanks. Best wishes, Christian

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• in playgame button Game Get freezed

  - by bmindhacker

  Hey guys i have done a game in cocos2d.And now i am stuck .i have a menu scene and a game scene. In menu scene i have a button named "Play Game". when i press this button game starts perfectly after game over i have a button named "Go back to main menu" that is used to take back to main menu scene now after game over when i click "PlayGame" button game does not perform any action and get freeze. please please help me guys i will be really thankful to you.

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• Multiple file selection for an upload control

  - by Abel Morelos

  Hi, I was trying to do something like this: http://www.element-it.com/Examples/MultiPowUpload/AdvancedHTMLinterface.html But in my search for information I found that is not possible to perform multiple file selection with simple HTML and JavaScript (and JSP in the server side). There is a way to do this without using Flash? A third party component you could recommend? Thanks.

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• Lotus view column compare to string/integer

  - by Kris.Mitchell

  I have a lotus view that stores a number. I need to perform some math against the value, but I am having a lot of problems getting the types to match up. doc.numOfGold = numGold and CInt(doc.numOfGold) = numGold and CInt(doc.numOfGold) = CInt(numGold) and doc.numOfGold = CInt(numGold) all return type mismatch. I've tried changing the column properties to treat it as a decimal, with no better luck. Any thoughts? Thanks!

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• Is it possible to use SQL XML to insert, and get output from each record?

  - by nbolton

  I would like to perform a SQL XML insert (on MSSQL), and in this case I need to insert a list of files into the DB (this is simple enough). However, there's an auto generated PK column (ID), and I need the ID for each newly created filename without performing a 2nd query. Is this possible? I guess it doesn't matter if the result is/isn't XML, but the input certainly has to be.

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• Can I query inside a SQLite Transaction?

  - by CSharperWithJava

  I'm using the SQLite3 database system in the Android library. I need to execute a query during a transaction to see if there is a similar entry already there. If there is, I have to perform some other logic and adjustments before I add a new row. Can I execute a query within a transaction and get the result back immediately?

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• Where can I find a C# implementation of SHA-1 not using the built in libraries?

  - by Peter

  I am trying to rewrite the sha-1 algorithm for parallelization in a personal project of mine. Just wondering if anyone knows where I can find a C# implementation of the actual mathematical operations to perform the hash, not just the System.Security.Cryptography function.

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• Align 2 sets of 2D point clouds

  - by user108088

  From what I gather, there are two major methods to perform alignment on point clouds, Iterative Closest Point (ICP) and Particle Filtering. What are the advantages of each method? And can someone point me some good tutorials. For what I am currently doing, I think ICP would be easier, I can't seem to find any simple reference implementations online for 2d point sets. Has anyone seen (psuedo)code for ICP with details on the transformation step? Thanks in advance.

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• java multiple operations depending on the type of the object passed

  - by mixm

  assuming i create a method which is passed an object, and that method would perform an action depending on the object passed. how should i identify the object? i thought of using the class name to identify the object, but may be impractical since i could easily change the class name of objects, and generate headaches during future development. am i right?

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• How can I validate two or more fields in combination?

  - by DR

  I'm using JPA 2.0/Hibernate validation to validate my models. I now have a situation where the combination of two fields has to be validated: public class MyModel { public Integer getValue1() { //... } public String getValue2() { //... } } The model is invalid if both getValue1() and getValue2() are null and valid otherwise. How can I perform this kind of validation with JPA 2.0/Hibernate? With a simple @NotNull annotation both getters must be non-null to pass validation.

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• How to Load PDF in silverlight

  - by Srikanth

  Hi....I need to prepare proof-of-concept for a silverlight application. For that I need to load PDF in silverlight. I just need to load PDF in browser and allow the user to perform next, previous, stop and pause actions. Anybody can help out.

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• What are the default access rights for a process started with ShellExecuteEx?

  - by Heinrich Ulbricht

  I need to perform certain operation on a process started with ShellExecuteEx like waiting for it, duplicating handles, querying and setting information etc. Now I am wondering if I can do all these things on the hProcess member which is returned in the SHELLEXECUTEINFO structure I pass. Does anybody know this? Do I have rights like PROCESS_DUP_HANDLE, SYNCHRONIZE, PROCESS_SET_INFORMATION, PROCESS_QUERY_INFORMATION and so on by default?

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• Video player plugin in wordpress

  - by Ramya

  Hai, I would like to have a post thumbnail in the index page of wordpress site. And when you click on the post thumbnail, it opens the specific post page to play the video attached in that post. basically the post is a video. can u guys help in finding some good plugin to perform this task

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