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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...
Creating Multifield Indexes in Mongoose / MongoDB
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You call the index method on your Schema object to do that as shown here. For your case it wo...
Convert a list to a dictionary in Python
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Print commit message of a given commit in git
... "plumbing", but it'll do exactly what you want:
$ git log --format=%B -n 1 <commit>
If you absolutely need a "plumbing" command (not sure why that's a requirement), you can use rev-list:
$ git rev-list --format=%B --max-count=1 <commit>
Although rev-list will also print out the co...
Return a value if no rows are found in Microsoft tSQL
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How to filter Pandas dataframe using 'in' and 'not in' like in SQL
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You can use pd.Series.isin.
For "IN" use: something.isin(somewhere)
Or for "NOT IN": ~something....
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...
Append column to pandas dataframe
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It seems in general you're just looking for a join:
> dat1 = pd.DataFrame({'dat1': [9,5]})...
How to reorder data.table columns (without copying)
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Use setcolorder():
library(data.table)
x <- data.table(a = 1:3, b = 3:1, c = runif(3))
x
#...
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...