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pandas: filter rows of DataFrame with operator chaining
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398
I'm not entirely sure what you want, and your last line of code does not help either, but anyw...
How to make good reproducible pandas examples
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341
Note: The ideas here are pretty generic for Stack Overflow, indeed questions.
Disclaimer: Wri...
How to apply a function to two columns of Pandas dataframe
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318
Here's an example using apply on the dataframe, which I am calling with axis = 1.
Note the d...
Python 3.x rounding behavior
I was just re-reading What’s New In Python 3.0 and it states:
11 Answers
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How do I get indices of N maximum values in a NumPy array?
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365
The simplest I've been able to come up with is:
In [1]: import numpy as np
In [2]: arr = np....
Formatting floats without trailing zeros
...rtelli
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How can I check which version of Angular I'm using?
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Kabb5
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answered Apr 15 '13 at 14:35
TheHippoTheHippo...
Fastest way to check if a string matches a regexp in ruby?
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answered Mar 16 '17 at 12:30
Wiktor StribiżewWiktor Stribiżew
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Apply a function to every row of a matrix or a data frame
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You simply use the apply() function:
R> M <- matrix(1:6, nrow=3, byrow=TRUE)
R> M
[,1] [,2]
[1,] 1 2
[2,] 3 4
[3,] 5 6
R> apply(M, 1, function(x) 2*x[1]+x[2])
[1] 4 10 16
R>
This takes a matrix and applies a (silly) function to each row. You pass extr...
What are the mathematical/computational principles behind this game?
...nd you have the question:
Can we have a geometry with just 2 points? With 3 points? With 4? With 7?
There are still open questions regarding this problem but we do know this:
If there are geometries with Q points, then Q = n^2 + n + 1 and n is called the order of the geometry.
There are n+1 poin...