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How to join (merge) data frames (inner, outer, left, right)
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edited Oct 30 '18 at 0:40
Nissa
4,58988 gold badges2525 silver badges3636 bronze badges
answered Aug ...
Visual Studio Expand/Collapse keyboard shortcuts [duplicate]
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354
Collapse to definitions
CTRL + M, O
Expand all outlining
CTRL + M, X
Expand or collapse ever...
Why does C++ need a separate header file?
I've never really understood why C++ needs a separate header file with the same functions as in the .cpp file. It makes creating classes and refactoring them very difficult, and it adds unnecessary files to the project. And then there is the problem with having to include header files, but having to...
Code Golf: Lasers
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Perl, 166 160 characters
Perl, 251 248 246 222 214 208 203 201 193 190 180 176 173 170 166 --> 160 chars.
Solution had 166 strokes when this contest ended, but A. Rex has found a couple ways to shave off 6 more characters:
s!.!$t{$s++}=$&!ge,$s=$r+=99...
The simplest possible JavaScript countdown timer? [closed]
... count down starts at the full duration
// example 05:00 not 04:59
start = Date.now() + 1000;
}
};
// we don't want to wait a full second before the timer starts
timer();
setInterval(timer, 1000);
}
window.onload = function () {
var fiv...
Omit rows containing specific column of NA
I want to know how to omit NA values in a data frame, but only in some columns I am interested in.
8 Answers
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I need to generate uuid for my rails application. What are the options(gems) I have? [duplicate]
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4 Answers
4
Active
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Immutable vs Unmodifiable collection
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edited Jan 17 '12 at 9:48
answered Jan 17 '12 at 9:41
Jo...
NUnit isn't running Visual Studio 2010 code
...anged the target framework setting for all the projects to ".NET Framework 4.0". I then built the solution without any errors. I can now use the NUnit GUI app to run tests built for .NET 4.0. I've not done exhaustive testing of this build so there may be problems, but for my purposes it works fine.
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Is there a way to check if a file is in use?
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edited Nov 7 '19 at 17:45
rboy
1,4671414 silver badges2727 bronze badges
answered Jun 2 '09 at 1:20
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