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How to read data when some numbers contain commas as thousand separator?

I have a csv file where some of the numerical values are expressed as strings with commas as thousand separator, e.g. "1,513" instead of 1513 . What is the simplest way to read the data into R? ...
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Is there a /dev/null on Windows?

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How do I create an abstract base class in JavaScript?

Is it possible to simulate abstract base class in JavaScript? What is the most elegant way to do it? 16 Answers ...
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How do I get the time difference between two DateTime objects using C#?

How do I get the time difference between two DateTime objects using C#? 9 Answers 9 ...
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p vs puts in Ruby

Is there any difference between p and puts in Ruby? 7 Answers 7 ...
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Case-insensitive string comparison in C++ [closed]

What is the best way of doing case-insensitive string comparison in C++ without transforming a string to all uppercase or all lowercase? ...
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What does “S3 methods” mean in R?

Since I am fairly new to R, I do not know what the S3 methods and objects are. I found that there are S3 and S4 object systems, and some recommend to use S3 over S4 if possible (See Google's R Style Guide at http://google-styleguide.googlecode.com/svn/trunk/google-r-style.html )*. However, I do not...
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Hidden features of Python [closed]

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How do I check if a list is empty?

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How to get just the parent directory name of a specific file

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