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Pass a data.frame column name to a function

I'm trying to write a function to accept a data.frame ( x ) and a column from it. The function performs some calculations on x and later returns another data.frame. I'm stuck on the best-practices method to pass the column name to the function. ...
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Build an iOS app without owning a mac? [closed]

Please correct me if I'm wrong. 12 Answers 12 ...
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How to make a JSONP request from Javascript without JQuery?

Can I make a cross-domain JSONP request in JavaScript without using jQuery or other external library? I would like to use JavaScript itself and then parse the data and make it an object so I could use it. Do I have to use an external library? If not, how can I do it? ...
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How to force a web browser NOT to cache images

I am writing and using a very simple CGI-based (Perl) content management tool for two pro-bono websites. It provides the website administrator with HTML forms for events where they fill the fields (date, place, title, description, links, etc.) and save it. On that form I allow the administrator to u...
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How do I speed up the gwt compiler?

We're starting to make heavier use of GWT in our projects, and the performance of the GWT compiler is becoming increasingly annoying. ...
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Warning: “format not a string literal and no format arguments”

Since upgrading to the latest Xcode 3.2.1 and Snow Leopard, I've been getting the warning 11 Answers ...
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How to use OpenFileDialog to select a folder?

How to use OpenFileDialog to select folders? 8 Answers 8 ...
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HTML 5 tag vs Flash video. What are the pros and cons?

This question was made over 9 years ago. It made sense then, it doesn't make it now. Flash is hard on its way out; <video> support is ubiquitous, including mobile devices. Almost anything that Flash could do, HTML can now do too. HTML won, Flash lost. If you're pondering on how to embed vide...
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In R, how to get an object's name after it is sent to a function?

I am looking for the reverse of get() . 3 Answers 3 ...
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What good technology podcasts are out there?

Yes, Podcasts, those nice little Audiobooks I can listen to on the way to work. With the current amount of Podcasts, it's like searching a needle in a haystack, except that the haystack happens to be the Internet and is filled with too many of these "Hot new Gadgets" stuff :( ...