Hi All,

I have been using R for a while but only recently tried to draw quality plots for publications.  I spent a few days tried to figure out how to draw multiple plots on a single page to a postscript or pdf file but not successful.  The drawing is perfect OK if it is displayed on the screen using x11() device.   E.g.

x11()
par(mfrow=c(2,2))
par(mai=c(0.5,0.3, 0.6, 0.4))

plot(x, y, ..........)
plot(x, z ...........)
plot(z, y,...........)
plot(z+x, x-y, .....)

Four plots displayed on the screen when X-Win32 was set up.  Please advice how can I save this to a postscript or PDF file or any kind of file for publication and powerpoint slide?

Thank a lot..

Zach Hu
Assistant Professor in Biology
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