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\name{plot.window}
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\name{plot.window}
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\title{Set up World Coordinates for Graphics Window}
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\usage{
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plot.window(xlim, ylim, log = "", asp = NA, \dots)
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}
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\alias{plot.window}
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\alias{plot.window}
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\arguments{
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\item{xlim, ylim}{numeric of length 2, giving the x and y coordinates ranges.}
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\item{log}{character; indicating which axes should be in log scale.}
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\item{asp}{numeric, giving the \bold{asp}ect ratio y/x.}
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\title{Set up World Coordinates for Graphics Window}
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\item{\dots}{further graphical parameters as in \code{\link{par}(..)}.}
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}
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\description{
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\description{
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This function sets up the world coordinate system for a graphics
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This function sets up the world coordinate system for a graphics
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window. It is called by higher level functions such as
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window. It is called by higher level functions such as
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\code{\link{plot.default}} (\emph{after} \code{\link{plot.new}}).
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\code{\link{plot.default}} (\emph{after} \code{\link{plot.new}}).
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}
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}
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\usage{
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plot.window(xlim, ylim, log = "", asp = NA, \dots)
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}
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\arguments{
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\item{xlim, ylim}{numeric of length 2, giving the x and y coordinates
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ranges.}
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\item{log}{character; indicating which axes should be in log scale.}
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\item{asp}{numeric, giving the \bold{asp}ect ratio y/x.}
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\item{\dots}{further graphical parameters as in \code{\link{par}}.}
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}
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\details{
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\details{
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Note that if \code{asp} is a finite positive value then
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Note that if \code{asp} is a finite positive value then the window is
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the window is set up so that one data unit in the x direction
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set up so that one data unit in the x direction is equal in length to
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is equal in length to \code{asp} \eqn{\times}{*} one data unit in the
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\code{asp} \eqn{\times}{*} one data unit in the y direction.
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y direction.
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The special case \code{asp == 1} produces plots where distances
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The special case \code{asp == 1} produces plots where distances
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between points are represented accurately on screen. Values
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between points are represented accurately on screen. Values with
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with \code{asp > 1} can be used to produce more accurate maps when
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\code{asp > 1} can be used to produce more accurate maps when using
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using latitude and longitude.
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latitude and longitude.
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Usually, one should rather use the higher level functions such as
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Usually, one should rather use the higher level functions such as
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\code{\link{plot}}, \code{\link{hist}}, \code{\link{image}}, \dots,
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\code{\link{plot}}, \code{\link{hist}}, \code{\link{image}}, \dots,
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instead and refer to their help pages for explanation of the arguments.
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instead and refer to their help pages for explanation of the
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arguments.
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}
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\seealso{
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\code{\link{xy.coords}},
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\code{\link{plot.xy}},
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\code{\link{plot.default}}.
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}
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}
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\seealso{\code{\link{xy.coords}}, \code{\link{plot.xy}}, \code{\link{plot.default}}.}
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\examples{
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\examples{
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##--- An example for the use of `asp' :
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##--- An example for the use of `asp' :
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library(mva)
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library(mva)
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data(eurodist)
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data(eurodist)
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loc <- cmdscale(eurodist)
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loc <- cmdscale(eurodist)
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