Function: isnan x
This predicate returns
t if its floating-point argument is a NaN,
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GNU Emacs Lisp Reference Manual: Float Basicssp.
Here are read syntaxes for these special floating-point values:
infinity ‘ 1.0e+INF ’ and ‘ -1.0e+INF ’
not-a-number ‘ 0.0e+NaN ’ and ‘ -0.0e+NaN ’
The following functions are specialized for handling floating-point
<span>Function: isnan x This predicate returns t if its floating-point argument is a NaN,
Function: frexp x This function returns a cons cell ( s . e ) ,
where s and e are respectively the significand and
exponent of the floating-point number x .
If x is finite
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