square and points on the same figure

after typing
symbols(x=0.5, y=0.5, squares=c(0.3), add=TRUE)
it works.
I want to add one more using different length such as
symbols(x=0.5, y=0.5, squares=c(0.15), add=TRUE)
but this square did not show.

Chuck Cleland <ccleland at optonline.net> wrote:
Sam R. Smith wrote:

Hi,
I have the following code to 
randomly generate the 
points:
csr <-function(n=60){
x=runif(n)
y=runif(n)
f=cbind(x,y)
}
plot(csr())

I wonder how to code to draw a square centering on 0.5,0.5; with the length of each side to be 0.3 on the same figure with these plotted points?

?symbols

symbols(x=0.5, y=0.5, squares=c(0.3), add=TRUE)

Thanks,
Sam



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