panel.violin: Panel Function to create Violin Plots
In lattice: Trellis Graphics for R

Description Usage Arguments Details Author(s) See Also Examples

This is a panel function that can create a violin plot. It is typically used in a high-level call to bwplot.

panel.violin(x, y, box.ratio = 1, box.width,
             horizontal = TRUE,
             alpha, border, lty, lwd, col,
             varwidth = FALSE,
             bw, adjust, kernel, window, 
             width, n = 50, from, to, cut,
             na.rm, ...,
             identifier = "violin")

`x, y`	numeric vector or factor. Violin plots are drawn for each unique value of `y` (`x`) if `horizontal` is `TRUE` (`FALSE`)
`box.ratio`	ratio of the thickness of each violin and inter violin space
`box.width`	thickness of the violins in absolute units; overrides `box.ratio`. Useful for specifying thickness when the categorical variable is not a factor, as use of `box.ratio` alone cannot achieve a thickness greater than 1.
`horizontal`	logical. If FALSE, the plot is ‘transposed’ in the sense that the behaviours of `x` and `y` are switched. `x` is now the ‘factor’. See documentation of `bwplot` for a fuller explanation.
`alpha, border, lty, lwd, col`	graphical parameters controlling the violin. Defaults are taken from the `"plot.polygon"` settings.
`varwidth`	logical. If `FALSE`, the densities are scaled separately for each group, so that the maximum value of the density reaches the limit of the allocated space for each violin (as determined by `box.ratio`). If `TRUE`, densities across violins will have comparable scale.
`bw, adjust, kernel, window, width, n, from, to, cut, na.rm`	arguments to `density`, passed on as appropriate
`...`	arguments passed on to `density`.
`identifier`	A character string that is prepended to the names of grobs that are created by this panel function.

Creates Violin plot of x for every level of y. Note that most arguments controlling the display can be supplied to the high-level (typically bwplot) call directly.

Deepayan Sarkar Deepayan.Sarkar@R-project.org

bwplot, density

bwplot(voice.part ~ height, singer,
       panel = function(..., box.ratio) {
           panel.violin(..., col = "transparent",
                        varwidth = FALSE, box.ratio = box.ratio)
           panel.bwplot(..., fill = NULL, box.ratio = .1)
       } )