ggplot()initializes a ggplot object. It can be used to declare the input data frame for a graphic and to specify the set of plot aesthetics intended to be common throughout all subsequent layers unless specifically overridden.
Draw plot on current graphics device.
ggplot(data = NULL, mapping = aes(), ..., environment = parent.frame())"print"(x, newpage = is.null(vp), vp = NULL, ...)"plot"(x, newpage = is.null(vp), vp = NULL, ...)
fortify. If not specified, must be suppled in each layer added to the plot.
ggplot_build, which is a list with components that contain the plot itself, the data, information about the scales, panels etc.
ggplot()is typically used to construct a plot incrementally, using the + operator to add layers to the existing ggplot object. This is advantageous in that the code is explicit about which layers are added and the order in which they are added. For complex graphics with multiple layers, initialization with
There are three common ways to invoke
ggplot(df, aes(x, y,
The first method is recommended if all layers use the same
data and the same set of aesthetics, although this method
can also be used to add a layer using data from another
data frame. See the first example below. The second
method specifies the default data frame to use for the plot,
but no aesthetics are defined up front. This is useful when
one data frame is used predominantly as layers are added,
but the aesthetics may vary from one layer to another. The
third method initializes a skeleton
ggplot object which
is fleshed out as layers are added. This method is useful when
multiple data frames are used to produce different layers, as
is often the case in complex graphics.