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• SAS/R calculate distance between two groups

  - by user976856

  I would like to calculate distance between two groups. I am very confused. I have a two data sets. One is about a company and one is about employees. I would like to find out how their age( a company in which an employee is hired and an employee) are similar or not. I think I need to standarize also.. calcuate euclidean distance between each person and a company. (4-5 people in a company) calculate euclidean distance between each person and a company in industry level. My dataset is like this: person person_age company company_age insustry 1 50 1 5 1 2 40 1 5 1 3 30 2 1 1 4 20 2 1 1 5 25 3 8 2 Please help me. I don't mind using SAS or R. I am very confused.

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• Does Postgresql varchar count using unicode character length or ASCII character length?

  - by bennylope

  I tried importing a database dump from a SQL file and the insert failed when inserting the string Mér into a field defined as varying(3). I didn't capture the exact error, but it pointed to that specific value with the constraint of varying(3). Given that I considered this unimportant to what I was doing at the time, I just changed the value to Mer, it worked, and I moved on. Is a varying field with its limit taking into account length of the byte string? What really boggles my mind is that this was dumped from another PostgreSQL database. So it doesn't make sense how a constraint could allow the value to be written initially.

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• How to dynamically change fields in an .NET ORM

  - by rsteckly

  I'm working in ASP.NET in an application where often users want to add fields or change field names. I'd like to be able to have an xml schema in place that is parsed and a dynamic object model created from it that can be accessed throughout the application. My initial reaction is that this is not realistic. I think there is flexibility about the dynamic nature of it. I think the people I'm trying to build this for wouldn't mind recompiling. Even if the app recompiled, I don't know how to abstract away enough in my code access the data to allow for users changing property names, etc. How can you write LINQ when the properties might change? In short, there's two questions here: 1) is there a way to dynamically generate an object model of the database and 2) is there a way to abstract away enough so that code accessing the database doesn't break when properties change?

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• Is there a "dual user check-in" source control system?

  - by Zubair

  Are there any source control systems that require another user to validate the source code "before" it can be checked-in? I want to know as this is one technique to make sure that code quality is high. Update: There has been talk of "Branches" in the answers, and while I feel branches have there place I think that branchs are something different as when a developer's code is ready to go into the main branch it "should" be checked. Most often though I see that when this happens a lead developer or whoever is responsible for the merge into the main branch/stream just puts the code into the main branch as long as it "compiles" and does no more checks than that. I want the idea of two people putting their names to the code at an early stage so that it introduces some responsibility, and also because the code is cheaper to fix early on and is also fresh in the developers mind.

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• Shortest command to calculate the sum of a column of output on Unix?

  - by Andrew

  I'm sure there is a quick and easy way to calculate the sum of a column of values on Unix systems (using something like awk or xargs perhaps), but writing a shell script to parse the rows line by line is the only thing that comes to mind at the moment. For example, what's the simplest way to modify the command below to compute and display the total for the SEGSZ column (70300)? ipcs -mb | head -6 IPC status from /dev/kmem as of Mon Nov 17 08:58:17 2008 T ID KEY MODE OWNER GROUP SEGSZ Shared Memory: m 0 0x411c322e --rw-rw-rw- root root 348 m 1 0x4e0c0002 --rw-rw-rw- root root 61760 m 2 0x412013f5 --rw-rw-rw- root root 8192

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• Should all presentational images be defined in CSS?

  - by Grant Crofton

  I've been learning (X)HTML & CSS recently, and one of the main principles is that HTML is for structure and CSS for presentation. With that in mind, it seems to me that a fair number of images on most sites are just for presentation and as such should be in the CSS (with a div or span to hold them in the HTML) - for example logos, header images, backgrounds. However, while the examples in my book put some images in CSS, they are still often in the HTML. (I'm just talking about 'presentational' images, not 'structural' ones which are a key part of the content, for example photos in a photo site). Should all such images be in CSS? Or are there technical or logical reasons to keep them in the HTML? Thanks, Grant

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• Refactor C++ code to use a scripting language?

  - by Justin Ardini

  Background: I have been working on a platformer game written in C++ for a few months. The game is currently written entirely in C++, though I am intrigued by the possibility of using Lua for enemy AI and possibly some other logic. However, the project was designed without Lua in mind, and I have already written working C++ code for much of the AI. I am hoping Lua can improve the extensibility of the game, but don't know if it would make sense to convert existing C++ code into Lua. The question: When, if ever, is it appropriate to take fully functional C++ code and refactor it into a scripting language like Lua? The question is intentionally a bit vague, so feel free give answers that are not relevant to the given background.

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• extract doc file from WYSIWYG

  - by Fawaz Qamar

  Hi guys, Last week while i was working on WYSIWYG - cKeditor. a question came in my mind. Is there any way to extract or pull out the content of doc or docx file into the blogger or wordpress text area. For instance, we need not to select and copy the text or images from doc(x) file. All we need to do is hand over the file to WYSIWYG and content of doc(x) file is pasted in the post. Any suggestion would be appreciated. Thanks Fawaz

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• jQuery fadeTo not working in IE8

  - by Lynda

  I have a div fading in using fadeTo. It works great in Firefox and IE9. It does not work in IE8. Here is my code: JS: var $j = jQuery.noConflict(); window.onload = function(){ $j('#fadein').fadeTo(6000, 1, function() { }); }; HTML <div class="img-center" id="fadein" style="opacity:0;"> <img src="src.jpg" alt="Text" class="feature-image" /> </div> How do I get this to work in IE8? I do not mind changing from fadeTo to fadeIn or some other method of fading in a div as long as it works in IE8.

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• Question about a possible design pattern...

  - by Aftershock

  I have such a design in my mind.... My aim is to reuse the program with some features included and without some features. What is it called in the literature? class feature1 { void feature1function1(); void feature1function2(); } class feature2 { void feature2function1(); void feature2function2(); } class program: feature1, feature2 { void function1() { feature2function1(); } void function2() { feature1function1(); feature2function1(); } void execute() { function1(); function2(); } }

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• Wastage of resources in Virtualization

  - by Sabeen Malik

  I am not sure if this is the write place to ask the question. However i hope it is. When looking for a VPS earlier today, I was trying to understand how each container would work in the background. Keeping in mind the fact that the operating system uses most of the power and power on a system, wouldn't having multiple operating systems in the same machine mean more wastage of resources. For instance if i was running centOS on a dedicated box and it was running lets say 20 background OS level processes. Then i go and install a virtualization platform and install 5 more centOS virtual machines in the same system which are exactly the same as the host operating system. Doesn't this mean duplication of those 20 processes 6 times? So internally the context switching is happening between 120 processes instead of 20?

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• Android sending SOAP object over Https via ksoap2 2.5.8

  - by Jack-V

  My first time posting a question here so please do not mind my mistakes here. I'm currently making an android application fetching and sending information from a .asmx web service. Everything goes well with the ksoap2 library and am using HttpTransportSE to call the web service. So now what I'm trying to do is to use the HttpsTransportSE to call the web service over Https. I got java.security.cert.certpathvalidatorexception trustanchor for certpath not found exception. I have the server certificate in .pfx , .jks and .bks format. My questions is what do i do with it to make my HttpsTransportSE call to be success? I've read around with articles using custom SSLSocketFactory but am still not sure how to implement it in my application. Thanks in advance for any suggestion/advices

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• What scripting language would you use to put text over a generated image ?

  - by Younes

  I got this question from my cousin: "What will be the best way to create a similar working website just like: http://www.plakletters.nl". I have looked into the website and think that to start of with i'm gonna help my cousin write a script that loads all fonts installed on the system into a dropdownlist. This dropdownlist will post a font value back to the page and will create images with the input of a user that comes from a textbox. This images will have to be created server side, and I also want to give the users the ability (in the future) to lay their own text over an uploaded image, to see what the result will look like on their own image. I found some information about how to create images using php, I don't know if php can output a list of installed fonts from the system it's running on. What scripting language would you use to get this job done? Keep in mind i would just like to start with outputting some images based on user input using a scripting language.

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• count(*) vs count(row-name) - which is more correct?

  - by bread

  Does it make a difference if you do count(*) vs count(row-name) as in these two examples? I have a tendency to always write count(*) because it seems to fit better in my mind with the notion of it being an aggregate function, if that makes sense. But I'm not sure if it's technically best as I tend to see example code written without the * more often than not. count(*): select customerid, count(*), sum(price) from items_ordered group by customerid having count(*) > 1; vs. count(row-name): SELECT customerid, count(customerid), sum(price) FROM items_ordered GROUP BY customerid HAVING count(customerid) > 1;

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• Localizing a plist with grouped data

  - by Robert Altman

  Is there a way to localize a plist that contain hierarchical or grouped data? For instance, if the plist contains: Book 1 (dictionary) Key (string) Name (string) Description (localizable string) Book 2 (dictionary) Key (string) Name (string) Description (localizable string) (etcetera...) For the sake of the example, the Key and Name should not be translated (and preferably should not be duplicated in multiple localized property lists). Is there a mechanism for providing localizations for the localizable Description field without localizing the entire property list? The only other strategy that came to my mind is to store a lookup key in the description field and than use that to retrieve the localized text via NSLocalizedString(...) Thanks.

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• Problem storing string containing quotes

  - by Jack

  I have the following table - $sql = "CREATE TABLE received_queries ( sender_screen_name varchar(50), text varchar(150) )"; I use the following SQL statement to store values in the table $sql = "INSERT INTO received_queries VALUES ('$sender_screen_name', '$text')"; Now I am trying to store the following string as 'text'. One more #haiku: Cotton wool in mind; feeling like a sleep won't cure; I need some coffee. and I get the following error message Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 't cure; I need some coffee.')' at line 1 I think must be a pretty common problem. How do I solve it?

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• Python: Using `copyreg` to define reducers for types that already have reducers

  - by cool-RR

  (Keep in mind I'm working in Python 3, so a solution needs to work in Python 3.) I would like to use the copyreg module to teach Python how to pickle functions. When I tried to do it, the _Pickler object would still try to pickle functions using the save_global function. (Which doesn't work for unbound methods, and that's the motivation for doing this.) It seems like _Pickler first tries to look in its own dispatch for the type of the object that you want to pickle before looking in copyreg.dispatch_table. I'm not sure if this is intentional. Is there any way for me to tell Python to pickle functions with the reducer that I provide?

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• Save application preferences... registry/file?

  - by spender

  Where is the best place to store application preferences? In particular, I'd like to save preferences for a media player such as volume levels and the like. Two candidates spring to mind... file and registry. Which would be more appropriate? As a follow up to this, I'm also wondering if there are any APIs that aid in creating application specific settings. Unless someone advises me that this is wrong, I'd like to save stuff either in HKCU... or HKLM/Software/MyCompanyName/MyAppName/Key for the registry, or in %APPDATA\MyCompanyName\MyAppName\someTypeOfSettingsFile. As these seem to be commonly used for such settings, I'd assume that .Net makes it easy to store settings in these locations. Is there a simple high level API that can .Net offer me to read and write settings to these common locations?

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• Compiler construction and DirectX

  - by otkins

  Hi! I am a beginner in the process of designing and coding a project, I already have all the ideas on my head, but I have a problem impeding me of continuing this project. I feel the code is ugly and unreadable and I cannot continue it this way. The project is a programming language I have on my mind, and it has small graphics capabilities. Even being beginner, I want to code it using DirectX because everybody wants it. And I want to code it entirely, not depend on any wrapper libraries like SDL. I did a refactoring of the DirectX module and it exposed all the weaks. There is Direct3D code everywhere, but the code itself does very little! I would start building a project like this using DirectX or I should use just GDI and the Multimedia API of Windows? This is a good progress for a beginner?

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• How can I improve my programming skills with out a computer (or reading material)?

  - by Tom Duckering

  Given the recent and continued chaos with grounded flights and folks stuck in airports, and what not, I'm wondering if anyone has any suggestions for activities that would help sharpen and develop a progammer's mind. The constraints are: Laptop is out of battery and there are no free sockets. You're bored of the book you're reading or you have none with you. Reasonable resources such as a pen and pad of paper are available. Rules can be bent within reason. As daft examples, things I have thought about are: How I might optimise the boarding of a plane. How I might improve the UI of a departure board.

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• VBScript - using IF statements in a mail script?

  - by Kenny Bones

  I really need some quick tips here. I've got this VBScript script which sends an e-mail. And I want to do several checks to see if an attribute is true and if it is, write an additional line in the mail. How can I do this? This is part of the script: obMessage.HTMLBody = ""_ & "<MENU>"_ & "<LI type = square>This is a line</i>."_ I want something which looks like this: obMessage.HTMLBody = ""_ & "<MENU>"_ If statement1 = true Then & "<LI type = square>This is an additional line</i>."_ end if Preferrably, could some select statements be made? I don't really mind what the code looks like, I just want it to work as soon as possible :)

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• Delphi developer switching to C#

  - by Dorin Duminica

  Hello, I'm a Delphiholic for quite some time now and lately I was thinking of learning some C# as well, however I'm kinda' "afraid of the unknown", I've done some simple apps as a test drive for C# and I have to admit that I've liked it, HOWEVER I do not really like the IDE... that being said here's the question that I would appreciate if others who went down this path would answer: As a Delphi developer what are the "main basic" changes from the Delphi language(by basic I mean basic -- utility functions, streams, etc.), I'm used to add "System, Classes, Windows" to uses not "use System.XXX.YYY.ZZZ", I'm trying to make a partial equality in my mind from Delphi to C# until I can see where does Delphi go hand-in-hand with C# and so on... I hope the question is pretty clear, if not, do not hesitate to swear me and I'll try to clarify as well as I can :-)

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• What programming languages do you consider indispensable in your experience?

  - by Federico Ramponi

  Each programming language comes with its concepts, best practices, libraries, tools, community, in one word: culture. Learning more than one programming language will make you a better programmer, for the more concepts you learn, the faster you will feel comfortable when the next language or technology will come. Mine, so far, are C, some C++, and Python, and many times I read that it would be worth learning LISP, for "the profound enlightenment experience you will have when you finally get it" (quoting Eric Raymond). My questions are: Which is the next one you would consider a good investment to learn? Of the many programming languages you have learnt and worked with, which ones do you consider to be an essential part of one's CS culture, and why? EDIT. Further question: is there any language you would sincerely advise to avoid as a waste of time? (The famous, and questionable, slatings in this letter from Dijkstra come to my mind.)

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• Free service that allows storing game data online?

  - by StackedCrooked

  I have created a small game in Java and I would like to add the ability for a player to publish his highscores online. I'm willing to write the server software myself (it's easy these days with Ruby Mongrel, or even C++). All I just need to have some sort hosting. One solution that immediately comes to mind is Amazon EC2. But that's kind of expensive for my needs. Since the requirements are very minimal (I don't even need a website, just a web service) I think there may be a cheaper solution out there. Does anyone know of a free or cheap provider for this kind of thing?

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• user height and weight in sql

  - by Samuel

  We are planning to capture a user's height and weight and am looking for ideas on representing them in sql. I have the following questions in mind weight can be expressed in kilograms and grams and height in meters and centimeters, so should I capture them as a BigDecimal with an appropriate precision and scale or capture them as vanilla strings and do the manipulation in the user interface. Note: I am planning to capture the kilograms and grams separately in the user interface. should the metric of measurement be part of the sql (i.e. the end user might want to view this information in pounds, inches according to his preference) OR Should I just support kilograms / meters in the database and do the conversion while showing this in the user interface

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