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How to get a substring of text?
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246
If you have your text in your_text variable, you can use:
your_text[0..29]
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Print commit message of a given commit in git
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347
It's not "plumbing", but it'll do exactly what you want:
$ git log --format=%B -n 1 <commit...
How to get the index of a maximum element in a numpy array along one axis
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Definition of a Balanced Tree
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124
The constraint is generally applied recursively to every subtree. That is, the tree is only bala...
How to add new item to hash
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pjumblepjumble
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How do you plot bar charts in gnuplot?
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124
Simple bar graph:
set boxwidth 0.5
set style fill solid
plot "data.dat" using 1:3:xtic(2) wit...
What is the difference between BIT and TINYINT in MySQL?
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A TINYINT is an 8-bit integer value, a BIT field can store between 1 bit, BIT(1), and 64 bits, B...
python numpy machine epsilon
... given float type is to use np.finfo():
print(np.finfo(float).eps)
# 2.22044604925e-16
print(np.finfo(np.float32).eps)
# 1.19209e-07
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Adding a new array element to a JSON object
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242
JSON is just a notation; to make the change you want parse it so you can apply the changes to a...
Generate array of all letters and digits
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[*('a'..'z'), *('0'..'9')] # doesn't work in Ruby 1.8
or
('a'..'z').to_a + ('0'..'9').to_a #...