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Append value to empty vector in R?
...et.seed(21)
values <- sample(letters, 1e4, TRUE)
vector <- character(0)
# slow
system.time( for (i in 1:length(values)) vector[i] <- values[i] )
# user system elapsed
# 0.340 0.000 0.343
vector <- character(length(values))
# fast(er)
system.time( for (i in 1:length(values)) vec...
Is there a Boolean data type in Microsoft SQL Server like there is in MySQL? [duplicate]
...e BIT datatype to represent boolean data. A BIT field's value is either 1, 0, or null.
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Why does 2 mod 4 = 2?
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edited Aug 29 '09 at 17:33
Joe Phillips
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How to compare two strings in dot separated version format in Bash?
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204
Here is a pure Bash version that doesn't require any external utilities:
#!/bin/bash
vercomp (...
How would I get a cron job to run every 30 minutes?
I'm looking to add a crontab entry to execute a script every 30 minutes, on the hour and 30 minutes past the hour or something close. I have the following, but it doesn't seem to run on 0.
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jQuery equivalent of getting the context of a Canvas
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Try:
$("#canvas")[0].getContext('2d');
jQuery exposes the actual DOM element in numeric indexes, where you can perform normal JavaScript/DOM functions.
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How do I tell Maven to use the latest version of a dependency?
...epository, com.foo:my-foo has the following metadata:
<?xml version="1.0" encoding="UTF-8"?><metadata>
<groupId>com.foo</groupId>
<artifactId>my-foo</artifactId>
<version>2.0.0</version>
<versioning>
<release>1.1.1</release&...
how to override left:0 using CSS or Jquery?
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answered Apr 11 '12 at 9:06
Jan HančičJan Hančič
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Show data on mouseover of circle
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answered May 29 '12 at 20:25
Lars KotthoffLars Kotthoff
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How to change checkbox's border style in CSS?
...I change checkbox (input) border's style? I've put border:1px solid #1e5180 upon it, but in FireFox 3.5, nothing happens!
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