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How to remove last n characters from every element in the R vector
...rame("data"=char_array,"data2"=1:4)
a$data = substr(a$data,1,nchar(a$data)-3)
a should now contain:
data data2
1 foo_ 1
2 bar_ 2
3 ap 3
4 b 4
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Pip freeze vs. pip list
... be in a specific format for pip to understand, which is
feedparser==5.1.3
wsgiref==0.1.2
django==1.4.2
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That is the "requirements format".
Here, django==1.4.2 implies install django version 1.4.2 (even though the latest is 1.6.x).
If you do not specify ==1.4.2, the latest version available ...
How to cast int to enum in C++?
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answered Jul 12 '12 at 13:33
AndrewAndrew
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How to save a list as numpy array in python?
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163
First of all, I'd recommend you to go through NumPy's Quickstart tutorial, which will probably ...
How can I create a copy of an object in Python?
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193
To get a fully independent copy of an object you can use the copy.deepcopy() function.
For more...
How do you detect where two line segments intersect? [closed]
...ntersect.
Credit: this method is the 2-dimensional specialization of the 3D line intersection algorithm from the article "Intersection of two lines in three-space" by Ronald Goldman, published in Graphics Gems, page 304. In three dimensions, the usual case is that the lines are skew (neither paral...
How do I get the key at a specific index from a Dictionary in Swift?
...ulian Onofrei
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answered Jul 8 '14 at 20:20
Mick MacCallumMick MacCallum
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Adding external library in Android studio
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edited Sep 3 '19 at 7:05
Machado
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Working with huge files in VIM
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Edit SMALLPART using your favourite editor.
Combine the file:
(head -n 3 HUGEFILE; cat SMALLPART; sed -e '1,5d' HUGEFILE) > HUGEFILE.new
i.e: pick all the lines before the edited lines from the HUGEFILE (which in this case is the top 3 lines), combine it with the edited lines (in this cas...
How to tell which version of a gem a rails app is using
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173
In Rails 3 and Rails 4, use bundle show
In Rails 2, rake gems will print out what gems, depende...