[R] Text with differents colors in a plot / Detecting if text exists

[Jim Lemon]

Maja Schröter wrote:
> Hi everybody,
> 
> I want to write some text in a plot.
> 
> That's simple I know. But I want to make use of different colors.
> 
> Eg. text(x,y,paste("Sunderland","high")).
> 
> Then Sunderland should be black and "high" red.
> 
> Has anyone an idea?
> 
> By the way. I'm looking for a function or something similar, that can check whether there is text in some regions on the plot. 
> Because I don't want to overwrite an existing text with a new one.
> 
Hi Maja,
For your first question:

text(c(9,9),c(5,5),c("Sunderland","high"),
  pos=c(2,4),offset=0.2,col=c("black","red"))

i.e., don't form a single string so that you can specify different 
colors and positions for the two words.

For the second one, I am about to upload a new version of the plotrix 
package that contains a function named "emptyspace". This tries to find 
the largest rectangle on a plot that has nothing plotted within it.

Jim