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Repeat each row of data.frame the number of times specified in a column
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old question, new verb in tidyverse:
library(tidyr) # version >= 0.8.0
df <- data.frame(var1=c('a', 'b', 'c'), var2=c('d', 'e', 'f'), freq=1:3)
df %>%
uncount(freq)
var1 var2
1 a d
2 b e
2.1 b e
3 ...
How can I generate a list or array of sequential integers in Java?
...Integer> makeSequence(int begin, int end) {
List<Integer> ret = new ArrayList(end - begin + 1);
for(int i = begin; i <= end; i++, ret.add(i));
return ret;
}
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How to pass variable from jade template file to a script file?
...s answer is dangerous, lagginreflex's answer correctly encodes the string (newlines in the login name could allow code execution).
– Paul Grove
Nov 8 '16 at 18:13
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How to get the start time of a long-running Linux process?
...that in this case I ran a "ps -p 1" command at about 16:50, then spawned a new bash shell, then ran the "ps -p 1 -p $$" command within that shell shortly afterward....)
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registerForRemoteNotificationTypes: is not supported in iOS 8.0 and later
...t permission to show one. This is described in the WWDC 2014 video "What's New in iOS Notifications"
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Replace duplicate spaces with a single space in T-SQL
...ass in a record and some jobs you may not have permission to create a band new procedure. Neil's uses per-existing functions because it uses <>, if you have a string like "release < now" then you'll get "release<><><<><>now", "release<<>now", "release&l...
CSV file written with Python has blank lines between each row
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Is it possible to allow didSet to be called during initialization in Swift?
...t) {
setSomeProperty(someProperty)
}
func setSomeProperty(newValue:AnyObject) {
self.someProperty = newValue
}
}
By declaring someProperty as type: AnyObject! (an implicitly
unwrapped optional), you allow self to fully initialize without
someProperty being set. ...
How to get the clicked link's href with jquery?
...unction () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f5508021%2fhow-to-get-the-clicked-links-href-with-jquery%23new-answer', 'question_page');
}
);
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Casting a variable using a Type variable
...input, performs the desired type conversion then gives the result boxed. A new one is needed not only for all types that get casted to, but also for the types that get casted (because of the unboxing step). Creating these expressions is highly time consuming, because of the reflection, the compilati...