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How do I compute derivative using Numpy?
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143
You have four options
Finite Differences
Automatic Derivatives
Symbolic Differentiation
Com...
Why is [1,2] + [3,4] = “1,23,4” in JavaScript?
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13 Answers
13
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Add new row to dataframe, at specific row-index, not appended?
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159
Here's a solution that avoids the (often slow) rbind call:
existingDF <- as.data.frame(mat...
Finding median of list in Python
...ated by taking the average of the two middle values:
>>> median([1, 3, 5])
3
>>> median([1, 3, 5, 7])
4.0
Usage:
import statistics
items = [6, 1, 8, 2, 3]
statistics.median(items)
#>>> 3
It's pretty careful with types, too:
statistics.median(map(float, items))
#&...
How to convert list of tuples to multiple lists?
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166
The built-in function zip() will almost do what you want:
>>> zip(*[(1, 2), (3, 4), ...
How do I create an empty array/matrix in NumPy?
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13 Answers
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Reshape three column data frame to matrix (“long” to “wide” format) [duplicate]
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190
There are many ways to do this. This answer starts with what is quickly becoming the standard...
Mod in Java produces negative numbers [duplicate]
When I calculate int i = -1 % 2 I get -1 in Java. In Python, I get 1 as the result of -1 % 2 .
What do I have to do to get the same behavior in Java with the modulo function?
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Algorithm to find Largest prime factor of a number
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134
Actually there are several more efficient ways to find factors of big numbers (for smaller one...
Convert base-2 binary number string to int
...e base of the input number, i.e. 2 for a binary number:
>>> int('11111111', 2)
255
Here is documentation for python2, and for python3.
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