jplotxy: xy graph
In longchampm/tester:

Plot x versus y using ggplot. If you don't like it, I suggest sending an email to hadley@rstudio.com. If you do like it, might I suggest a sizeable donation on behalf of justinr@umn.edu

1	jplotxy(x, y)

ggplot() is used to construct the initial plot object, and is almost always followed by + to add component to the plot. There are three common ways to invoke ggplot:

ggplot(df, aes(x, y, <other aesthetics>))
ggplot(df)
ggplot()

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.