ratiop

Arguments: object

Returns true if the argument is a ratio and returns nil otherwise. Note that an integer (a fixnum or a bignum) is not a ratio but is a rational. Integers and ratios partition rationals.

cl-user(7): (ratiop 1) ;; fixnums are not ratios
nil
cl-user(8): (ratiop 1/2) 
t
cl-user(9): (ratiop 2/1)  ;; Actually the fixnum 2, despite how it
                          ;; is represented
nil
cl-user(10): (ratiop 0.5) ;; floats are not ratios
nil
cl-user(11): (ratiop nil) ;; returns NIL for non-numbers (does not error)
nil
cl-user(12): 

See also fixnump, single-float-p, double-float-p, and rationalp.

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This page was not revised from the 8.1 page.
Created 2010.1.21.