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Simple Pivot Table to Count Unique Values
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16 Answers
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Python: fastest way to create a list of n lists
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105
The probably only way which is marginally faster than
d = [[] for x in xrange(n)]
is
from...
How to remove last n characters from every element in the R vector
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117
Here is an example of what I would do. I hope it's what you're looking for.
char_array = c("...
How do I get a list of all the duplicate items using pandas in python?
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10 Answers
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How to select lines between two marker patterns which may occur multiple times with awk/sed
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191
Use awk with a flag to trigger the print when necessary:
$ awk '/abc/{flag=1;next}/mno/{flag=...
Extract a number from a string (JavaScript)
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21 Answers
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How to change plot background color?
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You created a figure and axis/es together
fig, ax = plt.subplots(nrows=1, ncols=1)
You created a figure, then axis/es later
fig = plt.figure()
ax = fig.add_subplot(1, 1, 1) # nrows, ncols, index
You used the stateful API (if you're doing anything more than a few lines, and especially if you h...
class method generates “TypeError: … got multiple values for keyword argument …”
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The problem is that the first argument passed to class methods in python is always a copy of t...
How to increment a NSNumber
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Update: FYI, I personally like BoltClock's and DarkDusts's one-line answers better. They're mo...
How to output only captured groups with sed?
...e output as well as specifying what you do want.
string='This is a sample 123 text and some 987 numbers'
echo "$string" | sed -rn 's/[^[:digit:]]*([[:digit:]]+)[^[:digit:]]+([[:digit:]]+)[^[:digit:]]*/\1 \2/p'
This says:
don't default to printing each line (-n)
exclude zero or more non-digits
i...