Rational numbers are turned off -- see the file "xlisp.h" in your
source distribution, and search for "RATIOS". You'll have to write
Professor Tierney to ask if turning them on will break anything...
Bret Musser
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Bret J. Musser -- Univ. of Minn. -- Dept. of Statistics -- ยทยทยท@stat.umn.edu
http://stat.umn.edu/~bjm/ -- PGP key available on request