Intel® Fortran Compiler 18.0 Developer Guide and Reference
Elemental Module Intrinsic Function (Generic): Returns whether one or more of the arguments is Not-a-Number (NaN). This is equivalent to the IEEE unordered function.
USE, INTRINSIC :: IEEE_ARITHMETIC
result = IEEE_UNORDERED (x,y)
x |
(Input) Must be of type REAL. |
y |
(Input) Must be of type REAL. |
The result type is default logical. The result has the value true if x or y is a NaN, or both are NaNs; otherwise, false.
IEEE_UNORDERED (0.0, SQRT(-2.0)) has the value true if IEEE_SUPPORT_SQRT (2.0) has the value true.