ggformula (version 0.7.0)

gf_histogram: Formula interface to geom_histogram()

Description

Count and density histograms in ggformula.

Usage

gf_histogram(object = NULL, gformula = NULL, data = NULL, bins = 25,
  binwidth, alpha = 0.5, color, fill, group, linetype, size, xlab, ylab,
  title, subtitle, caption, geom = "bar", stat = "bin",
  position = "stack", show.legend = NA, show.help = NULL,
  inherit = TRUE, environment = parent.frame(), ...)
gf_dhistogram(object = NULL, gformula = NULL, data = NULL, bins = 25,
  binwidth, alpha = 0.5, color, fill, group, linetype, size, xlab, ylab,
  title, subtitle, caption, geom = "bar", stat = "bin",
  position = "stack", show.legend = NA, show.help = NULL,
  inherit = TRUE, environment = parent.frame(), ...)

Arguments

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 ~ x (or y ~ x, but this shape is not generally needed).

data

A data frame with the variables to be plotted.

bins

Number of bins. Overridden by binwidth. Defaults to 30

binwidth

The width of the bins. The default is to use bins bins that cover the range of the data. You should always override this value, exploring multiple widths to find the best to illustrate the stories in your data.

The bin width of a date variable is the number of days in each time; the bin width of a time variable is the number of seconds.

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.

linetype

A linetype (numeric or "dashed", "dotted", etc.) or a formula used for mapping linetype.

size

A numeric size or a formula used for mapping size.

xlab

Label for x-axis. See also gf_labs().

ylab

Label for y-axis. See also gf_labs().

title

Title, sub-title, and caption for the plot. See also gf_labs().

subtitle

Title, sub-title, and caption for the plot. See also gf_labs().

caption

Title, sub-title, and caption for the plot. See also gf_labs().

geom

A character string naming the geom used to make the layer.

stat

A character string naming the stat used to make the layer.

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. NA, the default, includes layer in the legends if any of the attributes of the layer are mapped.

show.help

If TRUE, display some minimal help.

inherit

A logical indicating whether default attributes are inherited.

environment

An environment in which to look for variables not found in data.

...

Additional arguments. Typically these are (a) ggplot2 aesthetics to be set with attribute = value, (b) ggplot2 aesthetics to be mapped with attribute = ~expression, or (c) attributes of the layer as a whole, which are set with attribute = value.

Value

a gg object

Details

Positional 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.

See Also

ggplot2::geom_histogram()

Examples

# NOT RUN {
x <- rnorm(1000)
gf_histogram(  ~ x, bins = 30)
gf_histogram( ..density.. ~ x, bins = 30)
gf_histogram(~ Sepal.Length | Species, data = iris, binwidth = 0.25)
if (require(mosaicData)) {
  gf_histogram(~age, data = HELPrct, binwidth = 5, fill = "skyblue", color = "black")
  # bins can be adjusted left/right using center or boundary
  gf_histogram(~age, data = HELPrct, binwidth = 5, fill = "skyblue", color = "black", center = 42.5)
  gf_histogram(~age, data = HELPrct, binwidth = 5, fill = "skyblue", color = "black", boundary = 40)
}
# }