d_ply {plyr} | R Documentation |
For each subset of a data frame, apply function and discard results
d_ply(.data, .variables, .fun = NULL, ..., .progress = "none", .print = FALSE)
.data |
data frame to be processed |
.variables |
variables to split data frame by, as quoted variables, a formula or character vector |
.fun |
function to apply to each piece |
... |
other arguments passed on to .fun |
.progress |
name of the progress bar to use, see create_progress_bar |
.print |
All plyr functions use the same split-apply-combine strategy: they split the
input into simpler pieces, apply .fun
to each piece, and then combine
the pieces into a single data structure. This function splits data frames
by variable and discards the output. This is useful for functions that you
are calling purely for their side effects like display plots and saving
output.
Hadley Wickham <h.wickham@gmail.com>