NaN Testing...

NaN's are also the only numbers not equal to themselves... So one could write (if one were certain of a numeric result):

(defun nanp (v)

(/= v v))

David McClain

Chief Technical Officer

Refined Audiometrics Laboratory

4391 N. Camino Ferreo

Tucson, AZ 85750

phone: 1.520.390.3995

Skype: dbmcclain