splitter_a {plyr} | R Documentation |
Split a 2d or higher data structure into lower-d pieces based
splitter_a(data, .margins = 1L, .expand = TRUE)
data |
>1d data structure (matrix, data.frame or array) |
.margins |
a vector giving the subscripts to split
up |
.expand |
if splitting a dataframe by row, should output be 1d (expand = FALSE), with an element for each row; or nd (expand = TRUE), with a dimension for each variable. |
This is the workhorse of the a*ply
functions.
Given a >1 d data structure (matrix, array, data.frame),
it splits it into pieces based on the subscripts that you
supply. Each piece is a lower dimensional slice.
The margins are specified in the same way as
apply
, but splitter_a
just splits up
the data, while apply
also applies a function and
combines the pieces back together. This function also
includes enough information to recreate the split from
attributes on the list of pieces.
a list of lower-d slices, with attributes that record split details
Other splitter functions: splitter_d
plyr:::splitter_a(mtcars, 1) plyr:::splitter_a(mtcars, 2) plyr:::splitter_a(ozone, 2) plyr:::splitter_a(ozone, 3) plyr:::splitter_a(ozone, 1:2)