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Understanding l_ply from plyr
2019 Community Moderator Electionmerging several data frames into a single expanded frameProblem loading the plyr packageLearning to understand plyr, ddplyWhy is plyr so slow?combining “quoted” objects from plyrSubset a list - a plyr way?understanding R performance plyr - dply and Factor variablesUnexpected result from plyr::aaplyWhat is most elegant way to loop through rows of a data frame with an impure function?How to define spacing of additional bar in barplot?
From the documentation:
All output is discarded. This is useful for functions that you are calling purely for their side effects like displaying plots or saving output.
I've spent some time playing around and trying to find a suitable use case but haven't(yet).
Looking at the examples hasn't helped me better understand it.
Sample usage:
l_ply(iris[1:5,1], function(x) print(summary(x)))
This will work.
However, under what circumstances might one need to print and then discard these results?
r plyr
asked yesterday
NelsonGonNelsonGon
3,1353730
add a comment |
From the documentation:
All output is discarded. This is useful for functions that you are calling purely for their side effects like displaying plots or saving output.
I've spent some time playing around and trying to find a suitable use case but haven't(yet).
Looking at the examples hasn't helped me better understand it.
Sample usage:
l_ply(iris[1:5,1], function(x) print(summary(x)))
This will work.
However, under what circumstances might one need to print and then discard these results?
r plyr
asked yesterday
NelsonGonNelsonGon
3,1353730
1
The example are simplified, in particular because side effects are not desirable in package examples. Typical functions passed would be plot, save, write.table ... All of these have (more) usefull side effects.
– Roland
yesterday
add a comment |
From the documentation:
All output is discarded. This is useful for functions that you are calling purely for their side effects like displaying plots or saving output.
I've spent some time playing around and trying to find a suitable use case but haven't(yet).
Looking at the examples hasn't helped me better understand it.
Sample usage:
l_ply(iris[1:5,1], function(x) print(summary(x)))
This will work.
However, under what circumstances might one need to print and then discard these results?
r plyr
asked yesterday
NelsonGonNelsonGon
3,1353730
From the documentation:
All output is discarded. This is useful for functions that you are calling purely for their side effects like displaying plots or saving output.
I've spent some time playing around and trying to find a suitable use case but haven't(yet).
Looking at the examples hasn't helped me better understand it.
Sample usage:
l_ply(iris[1:5,1], function(x) print(summary(x)))
This will work.
However, under what circumstances might one need to print and then discard these results?
r plyr
r plyr
asked yesterday
NelsonGonNelsonGon
3,1353730
asked yesterday
NelsonGonNelsonGon
3,1353730
asked yesterday
NelsonGonNelsonGon
3,1353730
asked yesterday
NelsonGonNelsonGon
3,1353730
asked yesterday
NelsonGonNelsonGon
3,1353730
3,1353730
1
The example are simplified, in particular because side effects are not desirable in package examples. Typical functions passed would be plot, save, write.table ... All of these have (more) usefull side effects.
– Roland
yesterday
add a comment |
1
The example are simplified, in particular because side effects are not desirable in package examples. Typical functions passed would be plot, save, write.table ... All of these have (more) usefull side effects.
– Roland
yesterday
1
1
The example are simplified, in particular because side effects are not desirable in package examples. Typical functions passed would be plot, save, write.table ... All of these have (more) usefull side effects.
– Roland
yesterday
The example are simplified, in particular because side effects are not desirable in package examples. Typical functions passed would be plot, save, write.table ... All of these have (more) usefull side effects.
– Roland
yesterday
add a comment |
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The example are simplified, in particular because side effects are not desirable in package examples. Typical functions passed would be plot, save, write.table ... All of these have (more) usefull side effects.
– Roland
yesterday