% Generated by roxygen2 (4.1.1): do not edit by hand
% Please edit documentation in R/maply.r
\name{maply}
\alias{maply}
\title{Call function with arguments in array or data frame, returning an array.}
\usage{
maply(.data, .fun = NULL, ..., .expand = TRUE, .progress = "none",
  .inform = FALSE, .drop = TRUE, .parallel = FALSE, .paropts = NULL)
}
\arguments{
\item{.data}{matrix or data frame to use as source of arguments}

\item{.fun}{function to apply to each piece}

\item{...}{other arguments passed on to \code{.fun}}

\item{.expand}{should output be 1d (expand = FALSE), with an element for
each row; or nd (expand = TRUE), with a dimension for each variable.}

\item{.progress}{name of the progress bar to use, see
\code{\link{create_progress_bar}}}

\item{.inform}{produce informative error messages?  This is turned off
by default because it substantially slows processing speed, but is very
useful for debugging}

\item{.drop}{should extra dimensions of length 1 in the output be
dropped, simplifying the output.  Defaults to \code{TRUE}}

\item{.parallel}{if \code{TRUE}, apply function in parallel, using parallel
backend provided by foreach}

\item{.paropts}{a list of additional options passed into
the \code{\link[foreach]{foreach}} function when parallel computation
is enabled.  This is important if (for example) your code relies on
external data or packages: use the \code{.export} and \code{.packages}
arguments to supply them so that all cluster nodes have the correct
environment set up for computing.}
}
\value{
if results are atomic with same type and dimensionality, a
  vector, matrix or array; otherwise, a list-array (a list with
  dimensions)
}
\description{
Call a multi-argument function with values taken from columns of an
data frame or array, and combine results into an array
}
\details{
The \code{m*ply} functions are the \code{plyr} version of \code{mapply},
specialised according to the type of output they produce.  These functions
are just a convenient wrapper around \code{a*ply} with \code{margins = 1}
and \code{.fun} wrapped in \code{\link{splat}}.
}
\section{Input}{
 Call a multi-argument function with values taken from
  columns of an data frame or array
}

\section{Output}{

  If there are no results, then this function will return a vector of
  length 0 (\code{vector()}).
}
\examples{
maply(cbind(mean = 1:5, sd = 1:5), rnorm, n = 5)
maply(expand.grid(mean = 1:5, sd = 1:5), rnorm, n = 5)
maply(cbind(1:5, 1:5), rnorm, n = 5)
}
\references{
Hadley Wickham (2011). The Split-Apply-Combine Strategy
  for Data Analysis. Journal of Statistical Software, 40(1), 1-29.
  \url{http://www.jstatsoft.org/v40/i01/}.
}
\seealso{
Other array output: \code{\link{aaply}};
  \code{\link{daply}}; \code{\link{laply}}

Other multiple arguments input: \code{\link{m_ply}};
  \code{\link{mdply}}; \code{\link{mlply}}
}
\keyword{manip}

