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dplyr: “Error in n(): function should not be called directly”
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Michael Bellhouse
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answered Apr 2 '14 at 3:59
mnelmnel
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How to import multiple .csv files at once?
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13 Answers
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What's the best way to send a signal to all members of a process group?
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33 Answers
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Regex to remove all (non numeric OR period)
I need for text like "joe ($3,004.50)" to be filtered down to 3004.50 but am terrible at regex and can't find a suitable solution. So only numbers and periods should stay - everything else filtered. I use C# and VS.net 2008 framework 3.5
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Array slicing in Ruby: explanation for illogical behaviour (taken from Rubykoans.com)
...emselves):
:peanut :butter :and :jelly
0 1 2 3 4
4 is still within the array, just barely; if you request 0 elements, you get the empty end of the array. But there is no index 5, so you can't slice from there.
When you do index (like array[4]), you are pointin...
Python: Why is functools.partial necessary?
...er having accepted it into Python whereas planned to remove it from Python 3, as one of "Python's glitches".
I fully supported him in that. (I love lambda in Scheme... while its limitations in Python, and the weird way it just doesn't fit in with the rest of the language, make my skin crawl).
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Why does multiprocessing use only a single core after I import numpy?
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