filled.contour {base} | R Documentation

## Level (Contour) Plots

### Description

This function produces a contour plot with the areas between the contours filled in solid color (Cleveland calls this a level plot). A key showing how the colors map to z values is shown to the right of the plot.

### Usage

    filled.contour(x = seq(0, 1, len = nrow(z)),
                   y = seq(0, 1, len = ncol(z)),
                   z,
                   xlim = range(x, finite=TRUE),
                   ylim = range(y, finite=TRUE),
                   zlim = range(z, finite=TRUE),
                   nlevels = 20,  levels = pretty(zlim, nlevels),
                   color.palette = cm.colors,
                   col = color.palette(length(levels) - 1),
                   plot.title, plot.axes, key.title, key.axes,
                   asp = NA, xaxs = "i", yaxs = "i", las = 1, axes = TRUE,
                   ...)

### Arguments

`x,y` | locations of grid lines at which the values in `z` are measured. These must be in ascending order. By default, equally spaced values from 0 to 1 are used. If `x` is a `list`, its components `x$x` and `x$y` are used for `x` and `y`, respectively. If the list has component `z` this is used for `z`.
`z` | a matrix containing the values to be plotted (`NA`s are allowed). Note that `x` can be used instead of `z` for convenience.
`xlim` | x limits for the plot.
`ylim` | y limits for the plot.
`zlim` | z limits for the plot.
`levels` | a set of levels which are used to partition the range of `z`. Areas with `z` values between consecutive levels are painted with the same color.
`nlevels` | if `levels` is not specified, the range of `z`, values is divided into approximately this many levels.
`color.palette` | a color palette function to be used to assign colors in the plot.
`col` | an explicit set of colors to be used in the plot. This argument overrides any palette function specification.
`plot.title` | statements which add titles the main plot.
`plot.axes` | statements which draw axes on the main plot. This overrides the default axes.
`key.title` | statements which add titles for the plot key.
`key.axes` | statements which draw axes on the plot key. This overrides the default axis.
`asp` | the y/x aspect ratio, see `plot.window`.
`xaxs` | the x axis style. The default is to use internal labeling.
`yaxs` | the y axis style. The default is to use internal labeling.
`las` | the style of labeling to be used. The default is to use horizontal labeling.
`...` | additional graphical parameters.

### Note

This function currently uses the `layout` function and so is restricted to a full page display. In future it is likely to be replaced by a genuine `levelplot` function which will work in multipanel displays.

### Author(s)

Ross Ihaka.

### References

Cleveland, W. S. (1993) Visualizing Data. Summit, New Jersey: Hobart.

### See Also

`contour`, `image`, `palette`.

### Examples

    data(volcano)
    filled.contour(volcano, color = terrain.colors, asp = 1)# simple

    x <- 10*1:nrow(volcano)
    y <- 10*1:ncol(volcano)
    filled.contour(x, y, volcano, color = terrain.colors,
        plot.title = title(main = "The Topography of Maunga Whau",
        xlab = "Meters North", ylab = "Meters West"),
        plot.axes = { axis(1, seq(100, 800, by = 100))
                      axis(2, seq(100, 600, by = 100)) },
        key.title = title(main="Height\n(meters)"),
        key.axes = axis(4, seq(90, 190, by = 10)))# maybe also asp=1
    mtext(paste("filled.contour(.) from", R.version.string),
          side = 1, line = 4, adj = 1, cex = .66)

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