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\name{D_make.groups}
\alias{make.groups}
\title{ Grouped data from multiple vectors }
\description{
Combines two or more vectors, possibly of different lengths, producing
a data frame with a second column indicating which of these vectors
that row came from. This is mostly useful for getting data into a
form suitable for use in high level Lattice functions.
}
\usage{
make.groups(\dots)
}
\arguments{
\item{\dots}{
one or more vectors of the same type (coercion is attempted if not),
or one or more data frames with similar columns, with possibly
differing number of rows.
}
}
\value{
When all the input arguments are vectors, a data frame with two
columns
\item{\code{data}}{
all the vectors supplied, concatenated
}
\item{\code{which}}{
factor indicating which vector the corresponding \code{data} value
came from
}
When all the input arguments are data frames, the result of
\code{\link{rbind}} applied to them, along with an additional
\code{which} column as described above.
}
\author{Deepayan Sarkar \email{Deepayan.Sarkar@R-project.org}}
\seealso{\code{\link{Lattice}}}
\examples{
sim.dat <-
make.groups(uniform = runif(200),
exponential = rexp(175),
lognormal = rlnorm(150),
normal = rnorm(125))
qqmath( ~ data | which, sim.dat, scales = list(y = "free"))
}
\keyword{dplot}
|
