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\name{gridVector}
\alias{gridVector}
\title{Grid vector coordinates}
\description{
Creates rectangular grid coordinates from two vectors.
}
\usage{
gridVector(x, y = NULL)
}
\arguments{
\item{x,y}{
numeric vectors
}
}
\details{
The grid is obtained by pairing each element of \code{y} with all
elements of \code{x}. The \code{X} and \code{Y} coordinates of the
points are stored in separate vectors. This is convenient, for
example, for plotting. It can be useful also for brute force
optimisation or simulation.
If \code{y} is \code{NULL}, the default, then \code{y = x}.
}
\value{
a list with two components, \code{X} and \code{Y}, giving the
coordinates which span the bivariate grid.
}
\seealso{
\code{\link{expand.grid}}
}
\examples{
## a small grid vector with row and col transformations
gridVector(0:2)
data.frame(gridVector(0:2))
do.call("rbind", gridVector(0:2))
gridVector(0:2, 0:3)
## grid over a unit square
gridVector((0:10)/10) # equivalently: gridVector((0:10)/10, (0:10)/10)
}
\keyword{hplot}
|
