[R] percentile-percentile plot

[Jean Eid]

Hi,

Is there a function that does percentile-percentile plot. I do not mean
the qqplot. I need to plot the percentiles rather than points themselves.
I am hoping for a plot that tells me that the x percentile of one data set
corresponds to the y percentile of the other. for example a point on the
plot of (.5, .2) will tell me that the 50th percentile of the first data
and the 20th percentile of the second data are equal.

Is there any function that does this?
Thank you for the help,
Jean,