HP Fortran Programmer's Reference (September 2007)

Intrinsic procedures
Intrinsic procedure specifications
Chapter 11574
Result value
The value of the result is |A| if B>= 0 and -|A| if B < 0.
ISNAN(X)
Description
Determine if a value is NaN (not a number).
Class
Elemental nonstandard function.
Argument
X must be of type real.
Result type
Logical.
IXOR(I, J)
Description
Exclusive OR.
Class
Elemental nonstandard function.
Arguments
I must be of type integer.
J must be of type integer with the same kind type parameter as I.
Result type/
type parameters
Same as I.