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  An example of a simple useful \code{panel} function to be used as
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  An example of a simple useful \code{panel} function to be used as
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  argument in e.g., \code{\link{coplot}} or \code{\link{pairs}}.
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  argument in e.g., \code{\link{coplot}} or \code{\link{pairs}}.
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}
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}
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\usage{
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\usage{
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panel.smooth(x, y, col = par("col"), bg = NA, pch = par("pch"),
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panel.smooth(x, y, col = par("col"), bg = NA, pch = par("pch"),
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             cex = 1, col.smooth = "red", span = 2/3, iter = 3,
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             cex = 1, col.smooth = 2, span = 2/3, iter = 3,
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             \dots)
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             \dots)
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}
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}
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\arguments{
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\arguments{
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  \item{x, y}{numeric vectors of the same length}
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  \item{x, y}{numeric vectors of the same length}
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  \item{col, bg, pch, cex}{numeric or character codes for the color(s),
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  \item{col, bg, pch, cex}{numeric or character codes for the color(s),
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  is typically used;
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  is typically used;
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  \code{\link{lowess}} which does the smoothing.
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  \code{\link{lowess}} which does the smoothing.
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}
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}
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\examples{
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\examples{
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pairs(swiss, panel = panel.smooth, pch = ".")  # emphasize the smooths
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pairs(swiss, panel = panel.smooth, pch = ".")  # emphasize the smooths
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pairs(swiss, panel = panel.smooth, lwd = 2, cex = 1.5, col = "blue")  # hmm...
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pairs(swiss, panel = panel.smooth, lwd = 2, cex = 1.5, col = 4)  # hmm...
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}
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}
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\keyword{hplot}
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\keyword{hplot}
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\keyword{dplot}
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\keyword{dplot}