HP 3000 Manuals

Compiler Library/XL Reference Manual

EXP (or EXP') 

EXP calculates ex , where x is a real number.

Declaration 

        FUNCTION EXP(VAR x:REAL):REAL; EXTERNAL;

Accuracy 


Attributes 

Parameter:                A representable real number in the range
                          [-87.3366, 88.7228].  See Chapter 1 for details
                          on the internal representation of real numbers.

Result:                   A representable positive real number.

HP FORTRAN 77/XL:         Intrinsic function:  Y=EXP(X).

Error:                    If the argument is a NaN, there are two cases.
                          If the INVALID trap is enabled, the message
                          "EXP(X): X=NaN" occurs.  Otherwise, the INVALID
                          flag is set.  In either case, a quiet NaN is
                          returned.

                          If the argument is >= 88.722839, the message
                          "EXP(X) OVERFLOW" occurs and the result is
                          infinity.  If the argument is <= -87.336548,
                          the message "EXP(X) UNDERFLOW" occurs and the
                          result is set to zero.

Special Values 

                 exp (+Infinity) = +Infinity

                 exp (-Infinity) = 0

MPE/iX 5.0 Documentation