[R] background color

[Petr Klasterecky]

What do you mean by background? Maybe this is enough:

plot(seq(-3,3,.01), dnorm(seq(-3,3,.01)), type="n", xlab="x", 
ylab="f(x)", main="Normal density")
polygon(x=c(-4,0,0,-4), y=c(-1,-1,.5,.5), col="red")
polygon(x=c(4,0,0,4), y=c(-1,-1,.5,.5), col="blue")
lines(seq(-3,3,.01), dnorm(seq(-3,3,.01)), type="l", lwd=2)

Play a little bit with the polygon margins to get what you need. You can 
even generate them automatically based on your data.

Petr

yannig goude napsal(a):
> hi,
>   I want to add different colors on the background of a classical plot. Each color is associated to an interval of the x axis.
>   example: the background is red on the interval [1,10], blue on [11,20].
>   I try the rect function but it isn't appropriate for the background.
>   Can any one can help me please?
>   best regards.
>      
> 
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-- 
Petr Klasterecky
Dept. of Probability and Statistics
Charles University in Prague
Czech Republic