Is there any way to split one dataframe into subsets of dataframes with dplyr according to group_by groups?
mtcars %>% group_by(cyl, gear) %>% (codes?)
thank a lot!
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What result do you expect? – HubertL Oct 13 '16 at 02:32
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I'm expecting a list of dataframes – zesla Oct 13 '16 at 02:36
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1http://stackoverflow.com/questions/33775239/emulate-split-with-dplyr-group-by-return-a-list-of-data-frames – mr.joshuagordon Oct 13 '16 at 02:36
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1The point of `group_by` is that it _doesn't_ split, but allows you to do operations as if you had. If you do want it split, use `split`. – alistaire Oct 13 '16 at 02:40
1 Answers
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Well, not that you'd really want to - but you can do it with tidyr, which is nearly the same thing.
library(dplyr)
library(tidyr)
data(iris)
iris %>%
group_by(Species) %>%
nest() %>%
select(data) %>%
unlist(recursive = F)
#> $data1
#> # A tibble: 50 x 4
#> Sepal.Length Sepal.Width Petal.Length Petal.Width
#> <dbl> <dbl> <dbl> <dbl>
#> 1 5.1 3.5 1.4 0.2
#> 2 4.9 3.0 1.4 0.2
#>
#> $data2
#> # A tibble: 50 x 4
#> Sepal.Length Sepal.Width Petal.Length Petal.Width
#> <dbl> <dbl> <dbl> <dbl>
#> 1 7.0 3.2 4.7 1.4
#> 2 6.4 3.2 4.5 1.5
#>
#> $data3
#> # A tibble: 50 x 4
#> Sepal.Length Sepal.Width Petal.Length Petal.Width
#> <dbl> <dbl> <dbl> <dbl>
#> 1 6.3 3.3 6.0 2.5
#> 2 5.8 2.7 5.1 1.9
Michael Griffiths
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