postscript( does not save the plot

Dear al,
I would like to thank you for your replies.

I have tried with graphics.off() but did not help too.

I am also sorry that my example was not reproducible

It has never been reproducible because you have ignored the request 3  
days ago to supply the 'test' object. You have also ignores the  
request that you post sessionInfo()

David Winsemius, MD
West Hartford, CT