panel.smoothScatter: Lattice panel function analogous to smoothScatter
In lattice: Trellis Graphics for R

Description Usage Arguments Details Value Author(s) Examples

This function allows the user to place smoothScatter plots in lattice graphics.

panel.smoothScatter(x, y = NULL,
                    nbin = 64, cuts = 255,
                    bandwidth,
                    colramp,
                    nrpoints = 100,
                    transformation = function(x) x^0.25,
                    pch = ".",
                    cex = 1, col="black",
                    range.x,
                    ...,
                    raster = FALSE,
                    subscripts,
                    identifier = "smoothScatter")

`x`	Numeric vector containing x-values or n by 2 matrix containing x and y values.
`y`	Numeric vector containing y-values (optional). The length of `x` must be the same as that of `y`.
`nbin`	Numeric vector of length 1 (for both directions) or 2 (for x and y separately) containing the number of equally spaced grid points for the density estimation.
`cuts`	number of cuts defining the color gradient
`bandwidth`	Numeric vector: the smoothing bandwidth. If missing, these functions come up with a more or less useful guess. This parameter then gets passed on to the function `bkde2D`.
`colramp`	Function accepting an integer `n` as an argument and returning `n` colors.
`nrpoints`	Numeric vector of length 1 giving number of points to be superimposed on the density image. The first `nrpoints` points from those areas of lowest regional densities will be plotted. Adding points to the plot allows for the identification of outliers. If all points are to be plotted, choose `nrpoints = Inf`.
`transformation`	Function that maps the density scale to the color scale.
`pch, cex`	graphical parameters for the `nrpoints` “outlying” points shown in the display
`range.x`	see `bkde2D` for details.
`col`	`points` color parameter
`...`	Further arguments that are passed on to `panel.levelplot`.
`raster`	logical; if `TRUE`, `panel.levelplot.raster` is used, making potentially smaller output files.
`subscripts`	ignored, but necessary for handling of ... in certain situations. Likely to be removed in future.
`identifier`	A character string that is prepended to the names of grobs that are created by this panel function.

This replicates the display part of the smoothScatter function by replacing standard graphics calls by grid-compatible ones.

The function is called for its side effects, namely the production of the appropriate plots on a graphics device.

Deepayan Sarkar deepayan.sarkar@r-project.org

ddf <- as.data.frame(matrix(rnorm(40000), ncol = 4) + 3 * rnorm(10000))
ddf[, c(2,4)] <- (-ddf[, c(2,4)])
xyplot(V1 ~ V2 + V3, ddf, outer = TRUE,
       panel = panel.smoothScatter, aspect = "iso")
splom(ddf, panel = panel.smoothScatter, nbin = 64, raster = TRUE)