The isnan(), isnand(), and isnanf() function return TRUE (1) if the argument dsrc or fsrc is a NaN; otherwise they return FALSE (0).
The finite() function returns TRUE (1) if the argument dsrc is neither infinity nor NaN; otherwise
it returns FALSE (0).
The unordered() function returns TRUE (1) if one of its two arguments is unordered with respect to the other argument.
This is equivalent to reporting whether either argument is NaN. If neither argument is NaN, FALSE (0) is returned.
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