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Regex to match only letters
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edited Sep 1 '10 at 12:17
answered Sep 1 '10 at 12:09
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How do I replace NA values with zeros in an R dataframe?
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21 Answers
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Python 3: UnboundLocalError: local variable referenced before assignment [duplicate]
The following code gives the error UnboundLocalError: local variable 'Var1' referenced before assignment :
5 Answers
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How can I match a string with a regex in Bash?
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answered Jul 2 '13 at 8:37
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How to put the legend out of the plot
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Extracting specific columns in numpy array
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I assume you wanted columns 1 and 9?
To select multiple columns at once, use
X = data[:, [1, 9]]
To select one at a time, use
x, y = data[:, 1], data[:, 9]
With names:
data[:, ['Column Name1','Column Name2']]
You can get the names from data.dtype.na...
How to determine if a list of polygon points are in clockwise order?
... telling you whether it's mostly clockwise).
Sum over the edges, (x2 − x1)(y2 + y1). If the result is positive the curve is clockwise, if it's negative the curve is counter-clockwise. (The result is twice the enclosed area, with a +/- convention.)
point[0] = (5,0) edge[0]: (6-5)(4+0) = 4
poi...
How to sort in mongoose?
... sort modifier. The only insight is in the unit tests:
spec.lib.query.js#L12
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How to avoid reinstalling packages when building Docker image for Python projects?
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Try to build a Dockerfile which looks something like this:
FROM my/base
WORKDIR /srv
ADD ./re...
Change one value based on another value in pandas
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One option is to use Python's slicing and indexing features to logically evaluate the places w...