Is there a way to specify a non-default adjustment for data symbols, similar to 
what "adj" does for text? 

For example, the following lines of code produce a red triangle on the bottom 
border of the plot:

plot(0, 0, type = 'n', xlab = "", ylab = "")
points(0.25, par("usr")[3], pch = 17, col = "red", cex = 2, xpd = TRUE)

I would like to draw the triangle completely outside the plotting area, with 
the upper vertex touching the x-axis...

Thank you in advance!


Giovanni Petris, PhD
Director of Statistics
Department of Mathematical Sciences
University of Arkansas - Fayetteville, AR 72701
Ph: (479) 575-6324, 575-8630 (fax)

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