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% File src/library/graphics/man/contour.Rd
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% File src/library/graphics/man/contour.Rd
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% Part of the R package, https://www.R-project.org
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% Part of the R package, https://www.R-project.org
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% Copyright 1995-2014 R Core Team
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% Copyright 1995-2019 R Core Team
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% Distributed under GPL 2 or later
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% Distributed under GPL 2 or later
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\name{contour}
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\name{contour}
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\alias{contour}
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\alias{contour}
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\alias{contour.default}
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\alias{contour.default}
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The default is \code{NULL} on graphics devices with high-quality
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The default is \code{NULL} on graphics devices with high-quality
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rotation of text and \code{c("sans serif", "plain")} otherwise.}
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rotation of text and \code{c("sans serif", "plain")} otherwise.}
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\item{xlim, ylim, zlim}{x-, y- and z-limits for the plot.}
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\item{xlim, ylim, zlim}{x-, y- and z-limits for the plot.}
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\item{axes, frame.plot}{logical indicating whether axes or a box
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\item{axes, frame.plot}{logical indicating whether axes or a box
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should be drawn, see \code{\link{plot.default}}.}
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should be drawn, see \code{\link{plot.default}}.}
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\item{col}{color for the lines drawn.}
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\item{col}{colour(s) for the lines drawn.}
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\item{lty}{line type for the lines drawn.}
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\item{lty}{line type(s) for the lines drawn.}
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\item{lwd}{line width for the lines drawn.}
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\item{lwd}{line width(s) for the lines drawn.}
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\item{add}{logical. If \code{TRUE}, add to a current plot.}
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\item{add}{logical. If \code{TRUE}, add to a current plot.}
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\item{\dots}{additional arguments to \code{\link{plot.window}},
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\item{\dots}{additional arguments to \code{\link{plot.window}},
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\code{\link{title}}, \code{\link{Axis}} and \code{\link{box}},
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\code{\link{title}}, \code{\link{Axis}} and \code{\link{box}},
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typically \link{graphical parameters} such as \code{cex.axis}.}
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typically \link{graphical parameters} such as \code{cex.axis}.}
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}
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}
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\code{f(x[i], y[j])} values, so that the x axis corresponds to row
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\code{f(x[i], y[j])} values, so that the x axis corresponds to row
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number and the y axis to column number, with column 1 at the bottom,
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number and the y axis to column number, with column 1 at the bottom,
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i.e.\sspace{}a 90 degree counter-clockwise rotation of the conventional textual
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i.e.\sspace{}a 90 degree counter-clockwise rotation of the conventional textual
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layout.
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layout.
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Vector (of length \eqn{> 1}) \code{col}, \code{lty}, and \code{lwd} are
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applied along \code{levels} and recycled, see the Examples.
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Alternatively, use \code{\link[lattice:levelplot]{contourplot}} from the
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Alternatively, use \code{\link[lattice:levelplot]{contourplot}} from the
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\CRANpkg{lattice} package where the \code{\link{formula}} notation allows
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\CRANpkg{lattice} package where the \code{\link{formula}} notation allows
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to use vectors \code{x}, \code{y}, and \code{z} of the same length.
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to use vectors \code{x}, \code{y}, and \code{z} of the same length.
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There is limited control over the axes and frame as arguments
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There is limited control over the axes and frame as arguments
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xlab = quote(x[1]), ylab = quote(x[2]))
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xlab = quote(x[1]), ylab = quote(x[2]))
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contour(x, x, z, ylim = c(-6, 6), nlev = 20, lty = 2, method = "simple",
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contour(x, x, z, ylim = c(-6, 6), nlev = 20, lty = 2, method = "simple",
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main = "20 levels; \"simple\" labelling method")
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main = "20 levels; \"simple\" labelling method")
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par(op)
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par(op)
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## Passing multiple colours / lty / lwd :
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op <- par(mfrow = c(1, 2))
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z <- outer(-9:25, -9:25)
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## Using default levels <- pretty(range(z, finite = TRUE), 10),
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## the first and last of which typically are *not* drawn:
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(levs <- pretty(z, n=10)) # -300 -200 ... 600 700
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contour(z, col = 1:4)
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## Set levels explicitly; show that 'lwd' and 'lty' are recycled as well:
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contour(z, levels=levs[-c(1,length(levs))], col = 1:5, lwd = 1:3 *1.5, lty = 1:3)
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par(op)
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## Persian Rug Art:
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## Persian Rug Art:
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x <- y <- seq(-4*pi, 4*pi, len = 27)
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x <- y <- seq(-4*pi, 4*pi, len = 27)
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r <- sqrt(outer(x^2, y^2, "+"))
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r <- sqrt(outer(x^2, y^2, "+"))
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opar <- par(mfrow = c(2, 2), mar = rep(0, 4))
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opar <- par(mfrow = c(2, 2), mar = rep(0, 4))
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for(f in pi^(0:3))
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for(f in pi^(0:3))
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