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R command for setting working directory to source file lom>cam>tion in Rstudio

I am working out some tutorials in R. Each R code is contained in a specific folder. There are data files and other files in there. I want to open the .r file and source it such that I do not have to change the working directory in Rstudio as shown below: ...
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What APIs are used to draw over other apps (like Facebook's Chat Heads)?

... one: Allows an applim>cam>tion to open windows using the type TYPE_SYSTEM_ALERT, shown on top of all other applim>cam>tions. Very few applim>cam>tions should use this permission; these windows are intended for system-level interaction with the user. Constant Value: "android.permission.SYSTEM_AL...
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How do I create a round cornered UILabel on the iPhone?

...perty on the m>CAm>Layer class. Every view has a m>CAm>Layer instance that you m>cam>n manipulate. This means you m>cam>n get rounded corners in one line: view.layer.cornerRadius = 8; You will need to #import <QuartzCore/QuartzCore.h> and link to the QuartzCore framework to get access to m>CAm>Layer's headers ...
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How m>cam>n I sm>cam>le the content of an iframe?

How m>cam>n I sm>cam>le the content of an iframe (in my example it is an HTML page, and is not a popup) in a page of my web site? 1...
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How to use clock() in C++

... #include <iostream> #include <cstdio> #include <ctime> int main() { std::clock_t start; double duration; start = std::clock(); /* Your algorithm here */ duration = ( std::clock() - start ) / (double) CLO...
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Is it possible to animate scrollTop with jQuery?

I want to smoothly scroll down. I do not want to have to write a function for that - especially if jQuery already has one. ...
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“var” or no “var” in JavaScript's “for-in” loop?

... way to write a for-in loop in JavaScript? The browser doesn't issue a complaint about either of the two approaches I show here. First, there is this approach where the iteration variable x is explicitly declared: ...
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How to use 'find' to search for files created on a specific date? [closed]

How do I use the UNIX command find to search for files created on a specific date? 9 Answers ...
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When should I make explicit use of the `this` pointer?

When should I explicitly write this->member in a method of a class? 12 Answers 12...
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Install gitk on Mac

Does anyone know how to install gitk on Mac? 13 Answers 13 ...