mark_sina: Add a sina mark

In glyph: A Grammar of Interactive Graphics

Add a sina mark

Description

Draws every row as a point, spread sideways within its group in proportion to the density of values at that height. The points fill the same outline a mark_violin() with the same settings would draw, so the two combine well.

Each point is still a row of the data, so tooltips, brushing and linked selections work on individual rows, as they do for mark_point(). The sideways positions are computed in R when the plot is compiled and are the same every time.

Usage

mark_sina(
  spec,
  ...,
  data = NULL,
  style = list(),
  bw = "nrd0",
  adjust = 1,
  width = 0.9
)

Arguments

spec	A glyph_spec
...	Aesthetic mappings: y (required, numeric), x, color and size.
data	Optional per-mark data override
style	Named list of fixed visual properties
bw	Smoothing bandwidth, passed to stats::density(): a number or the name of a bandwidth rule such as "nrd0" (the default) or "SJ".
adjust	Multiplier for the bandwidth. Values above 1 give smoother curves.
width	Width of the spread at the highest density, as a fraction of the space for its group, between 0 and 1.

Value

Modified glyph_spec object with the sina mark added

Examples

glyph(mtcars, x = factor(cyl), y = mpg) |>
  mark_violin() |>
  mark_sina()

glyph documentation built on Oct. 21, 2026, 5:12 p.m.