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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
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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
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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
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answered May 8 '...
Getting unique items from a list [duplicate]
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edited Sep 7 '09 at 9:20
Noldorin
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How to select first parent DIV using jQuery?
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edited Jun 8 '17 at 17:01
Nigel B. Peck
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