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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...
List distinct values in a vector in R
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169
Do you mean unique:
R> x = c(1,1,2,3,4,4,4)
R> x
[1] 1 1 2 3 4 4 4
R> unique(x)
[1] ...
python pandas dataframe to dictionary
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12 Answers
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How do I put an already-running process under nohup?
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11 Answers
11
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How do I generate random number for each row in a TSQL Select?
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19 Answers
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How does @synchronized lock/unlock in Objective-C?
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edited Aug 25 '15 at 23:28
tchrist
73.6k2626 gold badges116116 silver badges167167 bronze badges
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Remove an item from a dictionary when its key is unknown
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10 Answers
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What does a tilde do when it precedes an expression?
...rator that flips all bits in its operand.
For example, if your number was 1, its binary representation of the IEEE 754 float (how JavaScript treats numbers) would be...
0011 1111 1111 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
So ~ converts its operand to a 32 bit integer (...
WARN Could not determine content-length of response body. Set content-length of the response or set
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165
This is a problem of Webrick.
you can use "Thin" instead.
Add this to Gemfile
gem 'thin'
t...
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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