gf_dotplot | R Documentation |
Scatterplots in ggformula
.
gf_dotplot(
object = NULL,
gformula = NULL,
data = NULL,
...,
alpha,
color,
fill,
group,
binwidth = NULL,
binaxis = "x",
method = "dotdensity",
binpositions = "bygroup",
stackdir = "up",
stackratio = 1,
dotsize = 1,
stackgroups = FALSE,
origin = NULL,
right = TRUE,
width = 0.9,
drop = FALSE,
xlab,
ylab,
title,
subtitle,
caption,
position = "identity",
show.legend = NA,
show.help = NULL,
inherit = TRUE,
environment = parent.frame()
)
object |
When chaining, this holds an object produced in the earlier portions of the chain. Most users can safely ignore this argument. See details and examples. |
gformula |
A formula with shape |
data |
A data frame with the variables to be plotted. |
... |
Additional arguments. Typically these are
(a) ggplot2 aesthetics to be set with |
alpha |
Opacity (0 = invisible, 1 = opaque). |
color |
A color or a formula used for mapping color. |
fill |
A color for filling, or a formula used for mapping fill. |
group |
Used for grouping. |
binwidth |
When |
binaxis |
The axis to bin along, "x" (default) or "y" |
method |
"dotdensity" (default) for dot-density binning, or "histodot" for fixed bin widths (like stat_bin) |
binpositions |
When |
stackdir |
which direction to stack the dots. "up" (default), "down", "center", "centerwhole" (centered, but with dots aligned) |
stackratio |
how close to stack the dots. Default is 1, where dots just touch. Use smaller values for closer, overlapping dots. |
dotsize |
The diameter of the dots relative to |
stackgroups |
should dots be stacked across groups? This has the effect
that |
origin |
When |
right |
When |
width |
When |
drop |
If TRUE, remove all bins with zero counts |
xlab |
Label for x-axis. See also |
ylab |
Label for y-axis. See also |
title, subtitle, caption |
Title, sub-title, and caption for the plot.
See also |
position |
Either a character string naming the position function used for the layer or a position object returned from a call to a position function. |
show.legend |
A logical indicating whether this layer should be included in
the legends. |
show.help |
If |
inherit |
A logical indicating whether default attributes are inherited. |
environment |
An environment in which to look for variables not found in |
There are two basic approaches: dot-density and histodot.
With dot-density binning, the bin positions are determined by the data and
binwidth
, which is the maximum width of each bin. See Wilkinson
(1999) for details on the dot-density binning algorithm. With histodot
binning, the bins have fixed positions and fixed widths, much like a
histogram.
When binning along the x axis and stacking along the y axis, the numbers on y axis are not meaningful, due to technical limitations of ggplot2. You can hide the y axis, as in one of the examples, or manually scale it to match the number of dots.
a gg object
Dotplots in ggplot2
(and hence in ggformula
) often require some fiddling because
the default y-axis is meaningless and the ideal size of the dots depends on the
aspect ratio of the plot.
Positional attributes (a.k.a, aesthetics) are specified using the formula in gformula
.
Setting and mapping of additional attributes can be done through the
use of additional arguments.
Attributes can be set can be set using arguments of the form attribute = value
or
mapped using arguments of the form attribute = ~ expression
.
In formulas of the form A | B
, B
will be used to form facets using
facet_wrap()
or facet_grid()
.
This provides an alternative to
gf_facet_wrap()
and
gf_facet_grid()
that is terser and may feel more familiar to users
of lattice.
Evaluation of the ggplot2 code occurs in the environment of gformula
.
This will typically do the right thing when formulas are created on the fly, but might not
be the right thing if formulas created in one environment are used to create plots
in another.
Wilkinson, L. (1999) Dot plots. The American Statistician, 53(3), 276-281.
ggplot2::geom_dotplot()
data(penguins, package = "palmerpenguins")
gf_dotplot(~bill_length_mm, fill = ~species, data = penguins)
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