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How do I create an average from a Ruby array?
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Try this:
arr = [5, 6, 7, 8]
arr.inject{ |sum, el| sum + el }.to_f / arr.size
=> 6.5
Note the .to_f, which you'll want for avoiding any problems from integer division. You can also do:
arr = [5, 6, 7, 8]
arr.inject(0.0) { |sum, el| sum ...
What's the fastest way to merge/join data.frames in R?
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Python: Select subset from list based on index set
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Make Div overlay ENTIRE page (not just viewport)?
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How to join absolute and relative urls?
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answered Nov 22 '11 at 8:35
Cédric JulienCédric Julien
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What do the different readystates in XMLHttpRequest mean, and how can I use them?
XMLHttpRequest has 5 readyState s, and I only use 1 of them (the last one, 4 ).
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How does a UILabel's minimumScaleFactor work?
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You need to set the label.adjustsFontSizeToFitWidth = YES;
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Decreasing for loops in Python impossible?
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for n in range(6,0,-1):
print n
# prints [6, 5, 4, 3, 2, 1]
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iterating over each character of a String in ruby 1.8.6 (each_char)
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Extracting specific columns in numpy array
... edited Aug 23 at 10:39
cs95
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answered Dec 5 '11 at 14:24
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