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Can dplyr package be used for conditional mutating?
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Use ifelse
df %>%
mutate(g = ifelse(a == 2 | a == 5 | a == 7 | (a == 1 & b == 4), 2,
ifelse(a == 0 | a == 1 | a == 4 | a == 3 | c == 4, 3, NA)))
Added - if_else: Note that in dplyr 0.5 there is an if_else function defined so an alternative would be to replace ife...
warning: [options] bootstrap class path not set in conjunction with -source 1.5
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edited Apr 26 '17 at 18:01
Dave Jarvis
27.6k3535 gold badges157157 silver badges281281 bronze badges
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How can Xcode 6 adaptive UIs be backwards-compatible with iOS 7 and iOS 6?
...o the UI with Size Classes in Interface Builder DO appear correctly on iOS 7 devices and the Preview in Xcode. For example, I changed some Auto Layout constraints and font sizes for Regular height Regular width and those changed constraints are visible in the iPad Simulator running iOS 7.0.
All siz...
New features in java 7
What new features in java 7 is going to be implemented?
And what are they doing now?
8 Answers
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Cartesian product of x and y array points into single array of 2D points
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edited May 23 '17 at 11:55
Community♦
111 silver badge
answered Jun 21 '12 at 18:43
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Why does 'continue' behave like 'break' in a Foreach-Object?
... simulates the continue in a loop.
1..100 | ForEach-Object {
if ($_ % 7 -ne 0 ) { return }
Write-Host "$($_) is a multiple of 7"
}
There is a gotcha to be kept in mind when refactoring. Sometimes one wants to convert a foreach statement block into a pipeline with a ForEach-Object cmdlet (...
'str' object does not support item assignment in Python
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7 Answers
7
Active
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How can I do division with variables in a Linux shell?
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edited Aug 7 '13 at 3:04
answered Aug 7 '13 at 2:59
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Reset keys of array elements in php?
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edited Jun 7 '18 at 19:04
Riz-waan
54322 silver badges1212 bronze badges
answered May 8 '...