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}
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}
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\arguments{
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\arguments{
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\item{xlim, ylim}{numeric vectors of length 2, giving the x and y
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\item{xlim, ylim}{numeric vectors of length 2, giving the x and y
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coordinates ranges.}
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coordinates ranges.}
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\item{log}{character; indicating which axes should be in log scale.}
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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{asp}{numeric, giving the \bold{asp}ect ratio y/x, see below.}
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\item{\dots}{further graphical parameters as in \code{\link{par}}.
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\item{\dots}{further graphical parameters as in \code{\link{par}}.
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The relevant ones are \code{xaxs}, \code{yaxs} and \code{lab}.
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The relevant ones are \code{xaxs}, \code{yaxs} and \code{lab}.
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}
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}
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}
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}
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\details{
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\details{
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\describe{
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\item{asp:}{
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Note that if \code{asp} is a finite positive value then the window is
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If \code{asp} is a finite positive value then the window is
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set up so that one data unit in the x direction is equal in length to
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set up so that one data unit in the x direction is equal in length to
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\code{asp} \eqn{\times}{*} one data unit in the y direction.
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\code{asp} \eqn{\times}{*} one data unit in the y direction.
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Note that in this case, \code{\link{par}("usr")} is no longer
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determined by, e.g., \code{par("xaxs")}, but rather by \code{asp} and
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the device's aspect ratio. (See what happens if you interactively
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resize the plot device after running the example below!)
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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 with
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41 |
between points are represented accurately on screen. Values with
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\code{asp > 1} can be used to produce more accurate maps when using
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\code{asp > 1} can be used to produce more accurate maps when using
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latitude and longitude.
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latitude and longitude.
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}}
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To reverse an axis, use \code{xlim} or \code{ylim} of the form
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To reverse an axis, use \code{xlim} or \code{ylim} of the form
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\code{c(hi, lo)}.
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\code{c(hi, lo)}.
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The function attempts to produce a plausible set of scales if one or
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49 |
The function attempts to produce a plausible set of scales if one or
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both of \code{xlim} and \code{ylim} is of length one or the two values
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both of \code{xlim} and \code{ylim} is of length one or the two values
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given are identical, but it is better to avoid that case.
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given are identical, but it is better to avoid that case.
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Usually, one should rather use the higher level functions such as
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53 |
Usually, one should rather use the higher level functions such as
|
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