Drew Adams wrote: That doesn't tell me how to test if `foobar' is a NaN. See my previous email: I knew I could test `(equal foo 0.0e+Nan)', but I thought I would need to test against all of the possible NaN values.
The GNU C library has an isnan macro. From Lisp you could do: (defun nanp (obj) "Return t if OBJ is a NaN; nil otherwise," (and (numberp obj) (/= obj obj))) Sincerely, Luc. _______________________________________________ Emacs-devel mailing list Emacs-devel@gnu.org http://lists.gnu.org/mailman/listinfo/emacs-devel
