Using X11 from the mac terminal

X11()

Error in X11(d$display, d$width, d$height, d$pointsize, d$gamma,
d$colortype,  :
  unable to start device X11
In addition: Warning message:
In X11() : unable to open connection to X11 display ''

What am I doing wrong?  X11 is open, and I have

Sys.getenv("DISPLAY")

[1] "0.0.0.0:0"

I'm sure this used to work, but something has changed in the last few
months.  Any ideas?

Thanks!

Hadley

Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University
http://had.co.nz/