Error: (converted from warning) Ignoring unknown aesthetics

Question

Sometimes when I use ggplot2 I get following error:

> dframe <- data.frame(a=letters, b=LETTERS, x=runif(26), y=runif(26))
> p <- ggplot         


        

Answer 1

Place the aesthetic mapping under ggplot instead of geom_point to avoid the warning:

## This produces an "unknown aesthetic" warning
ggplot( mtcars, aes( x = wt, y = mpg ) ) + geom_point( aes( text = cyl ) )

## This doesn't
ggplot( mtcars, aes( x = wt, y = mpg, text = cyl ) ) + geom_point()