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}
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}
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\seealso{
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\seealso{
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  \code{\link{xyplot}}, \code{\link{Lattice}},
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  \code{\link{xyplot}}, \code{\link{Lattice}},
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  \code{\link{panel.levelplot}}
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  \code{\link{panel.levelplot}}
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}
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}
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\author{Deepayan Sarkar \email{deepayan@stat.wisc.edu}}
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\author{Deepayan Sarkar \email{Deepayan.Sarkar@R-project.org}}
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\examples{
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\examples{
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x <- seq(pi/4, 5 * pi, length = 100)
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x <- seq(pi/4, 5 * pi, length = 100)
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y <- seq(pi/4, 5 * pi, length = 100)
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y <- seq(pi/4, 5 * pi, length = 100)
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r <- as.vector(sqrt(outer(x^2, y^2, "+")))
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r <- as.vector(sqrt(outer(x^2, y^2, "+")))
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grid <- expand.grid(x=x, y=y)
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grid <- expand.grid(x=x, y=y)