[R] X11 plot window sizes

[Mark Knecht]

Hi,
   I'm not understanding how the width & height parameters are
supposed to work. When I execute the following 4 commands:

X11()
X11(width=20, height=20)
X11(width=20, height=10)
X11(width=40, height=40)

I get the following *approximate* physical sizes on my screen:

6" x 6"
8" x 8"
12" x 6"
8" x 8"

   For now I'm assuming that my pointsize isn't quite the same as
expected (1/72") which probably accounts for why I'm getting 6"
windows instead of the default 7" window, but why does 20x20 == 40x40,
and why on the 20x10 version do I get a 6" height?

Thanks,
Mark