Drew Adams wrote:
Does anyone know that these are not equivalent:
(equal 0.0e+NaN) <=?=> (and (numberp x) (/= x x))
That is, are there any objects equal to 0.0e+NaN that are not NaN?
They are equivalent. internal_equal contains:
case Lisp_Float:
{
double d1, d2;
d1 = extract_float (o1);
d2 = extract_float (o2);
/* If d is a NaN, then d != d. Two NaNs should be `equal' even
though they are not =. */
return d1 == d2 || (d1 != d1 && d2 != d2);
}
Yes, for testing a numberp to see if it is not NaN. However, I am
testing an arbitrary object. For that, (and (numberp x) (/= x x))
works and (equal x 0.0e+Nan) works.
Yes.
Sincerely,
Luc.
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