by-split.RdSplit a dataframe according to the levels of variables in the dataframe. The variables to split by can be given as a formula or as a character vector.
split_by(data, formula, drop = TRUE)
splitBy(formula, data = parent.frame(), drop = TRUE)
# S3 method for splitByData
head(x, n = 6L, ...)
# S3 method for splitByData
tail(x, n = 6L, ...)A data frame
Variables to split data frame by, as as.quoted
variables, a formula or character vector.
Logical indicating if levels that do not occur should be dropped. Deprecated; levels that do not occur are ignored.
An object.
A single integer. If positive or zero, size for the resulting object: number of elements for a vector (including lists), rows for a matrix or data frame or lines for a function. If negative, all but the "n" last/first number of elements of "x".
Arguments to be passed to or from other methods.
A list of dataframes.
data(dietox, package="doBy")
splitBy(formula = ~Evit + Cu, data = dietox)
#> listentry Evit Cu
#> 1 Evit000|Cu000 Evit000 Cu000
#> 2 Evit000|Cu035 Evit000 Cu035
#> 3 Evit200|Cu175 Evit200 Cu175
#> 4 Evit100|Cu035 Evit100 Cu035
#> 5 Evit100|Cu175 Evit100 Cu175
#> 6 Evit200|Cu035 Evit200 Cu035
#> 7 Evit200|Cu000 Evit200 Cu000
#> 8 Evit000|Cu175 Evit000 Cu175
#> 9 Evit100|Cu000 Evit100 Cu000
splitBy(formula = c("Evit", "Cu"), data = dietox)
#> listentry Evit Cu
#> 1 Evit000|Cu000 Evit000 Cu000
#> 2 Evit000|Cu035 Evit000 Cu035
#> 3 Evit200|Cu175 Evit200 Cu175
#> 4 Evit100|Cu035 Evit100 Cu035
#> 5 Evit100|Cu175 Evit100 Cu175
#> 6 Evit200|Cu035 Evit200 Cu035
#> 7 Evit200|Cu000 Evit200 Cu000
#> 8 Evit000|Cu175 Evit000 Cu175
#> 9 Evit100|Cu000 Evit100 Cu000
splitBy(~Treatment + Type, data=CO2)
#> listentry Treatment Type
#> 1 nonchilled|Quebec nonchilled Quebec
#> 2 chilled|Quebec chilled Quebec
#> 3 nonchilled|Mississippi nonchilled Mississippi
#> 4 chilled|Mississippi chilled Mississippi
splitBy(c("Treatment", "Type"), data=CO2)
#> listentry Treatment Type
#> 1 nonchilled|Quebec nonchilled Quebec
#> 2 chilled|Quebec chilled Quebec
#> 3 nonchilled|Mississippi nonchilled Mississippi
#> 4 chilled|Mississippi chilled Mississippi
x <- splitBy(~Treatment, data=CO2)
head(x)
#> $nonchilled
#> Plant Type Treatment conc uptake
#> 1 Qn1 Quebec nonchilled 95 16.0
#> 2 Qn1 Quebec nonchilled 175 30.4
#> 3 Qn1 Quebec nonchilled 250 34.8
#> 4 Qn1 Quebec nonchilled 350 37.2
#> 5 Qn1 Quebec nonchilled 500 35.3
#> 6 Qn1 Quebec nonchilled 675 39.2
#>
#> $chilled
#> Plant Type Treatment conc uptake
#> 22 Qc1 Quebec chilled 95 14.2
#> 23 Qc1 Quebec chilled 175 24.1
#> 24 Qc1 Quebec chilled 250 30.3
#> 25 Qc1 Quebec chilled 350 34.6
#> 26 Qc1 Quebec chilled 500 32.5
#> 27 Qc1 Quebec chilled 675 35.4
#>
tail(x)
#> $nonchilled
#> Plant Type Treatment conc uptake
#> 58 Mn3 Mississippi nonchilled 175 19.4
#> 59 Mn3 Mississippi nonchilled 250 25.8
#> 60 Mn3 Mississippi nonchilled 350 27.9
#> 61 Mn3 Mississippi nonchilled 500 28.5
#> 62 Mn3 Mississippi nonchilled 675 28.1
#> 63 Mn3 Mississippi nonchilled 1000 27.8
#>
#> $chilled
#> Plant Type Treatment conc uptake
#> 79 Mc3 Mississippi chilled 175 18.0
#> 80 Mc3 Mississippi chilled 250 17.9
#> 81 Mc3 Mississippi chilled 350 17.9
#> 82 Mc3 Mississippi chilled 500 17.9
#> 83 Mc3 Mississippi chilled 675 18.9
#> 84 Mc3 Mississippi chilled 1000 19.9
#>