R in a Nutshell, 2nd Edition

Quick Plot

As we saw above, the simplest way to use ggplot2 is with the qplot command:

qplot(x, y, ..., data, facets, margins, geom, stat,
  position, xlim, ylim, log, main, xlab, ylab

qplot is designed to pick default values that produce a readable plot (and uses helper functions to help make those choices based on the inputs data), but you can control how qplot works. Here is a description of the arguments to qplot:

Argument	Description	Default
x	X values.
y	Y values.	NULL
data	(Optional) Data frame in which x and y are defined.
facets	Describes facets to use as a formula. Uses facet_wrap for one-sided formula or facet_grid for a two sided formula.	NULL
margins	Enables displaying margins.	FALSE
geom	Specifies the geom to use as a vector of character values.	"auto" If x and y are specified, defaults to "point" If only x is specified, defaults to "histogram"
stat	Specifies statistics to use as a vector of character values.	list(NULL)
position	Specifies position adjustments.	list(NULL)
xlim	Limits for x-axis, as a vector of two values.	c(NA,NA)
ylim	Limits for y-axis, as a vector of two values.	c(NA,NA)
log	Specifies whether to display x-axis, y-axis, or both in log scale. Use "" for neither, "x" for just the x-axis, "y" for just the y-axis, and "xy" for both.	""
main	The title for the plot as a character values.	NULL
xlab	The label for the x-axis.	deparse(substitute(x))
ylab	The label for the y-axis.	deparse(substitute(y))
asp	The y/x aspect ratio.	NA
...	Other aesthetic attributes passed to lower layers.