Library ggplot

# General command
qplot(x, y, data=, color=, shape=, size=, alpha=, geom=, method=, formula=, facets=, xlim=, ylim= xlab=, ylab=, main=, sub=)

# Barplot - one set of data
qplot(mpg, data=mtcars)

# Scatterplot - two sets of data
qplot(hp, mpg, data=mtcars)

# Multiple geometries
qplot(wt, mpg, data=mtcars, geom=c("point", "smooth"))

# Adding other information

 # scatterplot
 ggplot(mtcars, aes(x = wt, y = mpg)) + geom_point()
 ggplot(diamonds, aes(x = carat, y = price))+geom_point()

 # smooth
 ggplot(diamonds, aes(x = carat, y = price))+geom_point() + geom_smooth()

 # line
 ggplot(mtcars, aes(x = wt, y = mpg)) + geom_point()