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Useful code which uses reduce()? [closed]
...n Scheme a lot...
Here's some cute usages:
Flatten a list
Goal: turn [[1, 2, 3], [4, 5], [6, 7, 8]] into [1, 2, 3, 4, 5, 6, 7, 8].
reduce(list.__add__, [[1, 2, 3], [4, 5], [6, 7, 8]], [])
List of digits to a number
Goal: turn [1, 2, 3, 4, 5, 6, 7, 8] into 12345678.
Ugly, slow way:
int("".j...
python pandas dataframe to dictionary
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12 Answers
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Python matplotlib multiple bars
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112
import matplotlib.pyplot as plt
from matplotlib.dates import date2num
import datetime
x = [
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Using module 'subprocess' with timeout
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177
In Python 3.3+:
from subprocess import STDOUT, check_output
output = check_output(cmd, stder...
Remove duplicate values from JS array [duplicate]
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Define variable to use with IN operator (T-SQL)
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14 Answers
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What happens if I define a 0-size array in C/C++?
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An array cannot have zero size.
ISO 9899:2011 6.7.6.2:
If the expression is a constant expression, it shall have a value greater than zero.
The above text is true both for a plain array (paragraph 1). For a VLA (variable length array), the behavior is undefined ...
How to combine multiple conditions to subset a data-frame using “OR”?
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my.data.frame <- subset(data , V1 > 2 | V2 < 4)
An alternative solution that mimics the behavior of this function and would be more appropriate for inclusion within a function body:
new.data <- data[ which( data$V1 > 2 | data$V2 < 4) , ]
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Efficient way to determine number of digits in an integer
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107
Well, the most efficient way, presuming you know the size of the integer, would be a lookup. ...
Run git pull over all subdirectories [duplicate]
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16 Answers
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