# Tools for splitting, applying and combining data

## Documentation for package ‘plyr’ version 1.7.1

- DESCRIPTION file.
- Package NEWS.

## Help Pages

. | Quote variables to create a list of unevaluated expressions for later evaluation.
aaply | Split array, apply function, and return results in an array.
adply | Split array, apply function, and return results in a data frame.
alply | Split array, apply function, and return results in a list.
arrange | Order a data frame by its colums.
as.data.frame.function | Make a function return a data frame.
as.quoted | Convert input to quoted variables.
a_ply | Split array, apply function, and discard results.
baseball | Yearly batting records for all major league baseball players
catcolwise | Column-wise function.
colwise | Column-wise function.
count | Count the number of occurences.
create_progress_bar | Create progress bar.
daply | Split data frame, apply function, and return results in an array.
ddply | Split data frame, apply function, and return results in a data frame.
defaults | Set defaults.
desc | Descending order.
dlply | Split data frame, apply function, and return results in a list.
d_ply | Split data frame, apply function, and discard results.
each | Aggregate multiple functions into a single function.
failwith | Fail with specified value.
idata.frame | Construct an immutable data frame.
is.quoted | Quote variables to create a list of unevaluated expressions for later evaluation.
join | Join two data frames together.
laply | Split list, apply function, and return results in an array.
ldply | Split list, apply function, and return results in a data frame.
liply | Experimental iterator based version of llply.
llply | Split list, apply function, and return results in a list.
l_ply | Split list, apply function, and discard results.
maply | Call function with arguments in array or data frame, returning an array.
match_df | Extract matching rows of a data frame.
mdply | Call function with arguments in array or data frame, returning a data frame.
mlply | Call function with arguments in array or data frame, returning a list.
mutate | Mutate a data frame by adding new or replacing existing columns.
m_ply | Call function with arguments in array or data frame, discarding results.
numcolwise | Column-wise function.
ozone | Monthly ozone measurements over Central America.
progress_text | Text progress bar.
progress_tk | Graphical progress bar, powered by Tk.
progress_win | Graphical progress bar, powered by Windows.
quoted | Quote variables to create a list of unevaluated expressions for later evaluation.
raply | Replicate expression and return results in a array.
rbind.fill | Combine data.frames by row, filling in missing columns.
rbind.fill.matrix | Bind matrices by row, and fill missing columns with NA.
rdply | Replicate expression and return results in a data frame.
rename | Modify names by name, not position.
rlply | Replicate expression and return results in a list.
round_any | Round to multiple of any number.
r_ply | Replicate expression and discard results.
splat | 'Splat' arguments to a function.
strip_splits | Remove splitting variables from a data frame.
summarise | Summarise a data frame.
summarize | Summarise a data frame.
vaggregate | Vector aggregate.