The bug: Using pch=0 in plot or points gives squares as a
symbol. Using it in legend leaves a blank space. (0.63.1)

The question: I am getting various reports that R under MS-Windows and
X-Windows/Linux on the same machine behaves very differently for nlm
convergence in my libraries. Under Linux, convergence is easy with
many starting values, but under MS they have to be very close to the
MLE. Does anyone have experience with this and or an explanation?
Is the math used different in the two systems?
  Jim
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