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How does @synchronized lock/unlock in Objective-C?
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edited Aug 25 '15 at 23:28
tchrist
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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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python pandas dataframe to dictionary
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12 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 (...
Remove an item from a dictionary when its key is unknown
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Python matplotlib multiple bars
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import matplotlib.pyplot as plt
from matplotlib.dates import date2num
import datetime
x = [
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WARN Could not determine content-length of response body. Set content-length of the response or set
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This is a problem of Webrick.
you can use "Thin" instead.
Add this to Gemfile
gem 'thin'
t...
Using module 'subprocess' with timeout
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In Python 3.3+:
from subprocess import STDOUT, check_output
output = check_output(cmd, stder...
Define variable to use with IN operator (T-SQL)
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14 Answers
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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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