Elemental Intrinsic Function (Generic): Tests whether IEEE* real (S_floating, T_floating, and X_floating) numbers are Not-a-Number (NaN) values.
result = ISNAN (x)
x |
(Input) Must be of type real. |
The result type is default logical. The result is .TRUE. if x is an IEEE NaN; otherwise, the result is .FALSE..
LOGICAL A
DOUBLE PRECISION B
...
A = ISNAN(B)
A is assigned the value .TRUE. if B is an IEEE NaN; otherwise, the value assigned is .FALSE..
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