[metapost] powers and log

[Robert Jerrard]

Thanks Rob, Daniel, and Mojca for the help. With x**y in metapost, of
course, I needed to think more first, for negative base I need to know
which complex root I may want. 

Also for logs, I guess I should not just look under l for log.

Thanks much, Bob
-- 
Dr. Robert J. Jerrard, Professor of Mathematics,
Concordia University College of Alberta,
7128 Ada Blvd., Edmonton, Alberta, T5B 4E4, Canada.
Phone: (780) 479-9291, Fax: (780) 474-1933.