HP 3000 Manuals

Compiler Library/XL Reference Manual

TANH (or TANH') 

TANH calculates the hyperbolic tangent of a real number.

Declaration 

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

Accuracy 

	       Click here to view figure.
Attributes 

Parameter:                A real number.

Result:                   A representable real number in the range [0.0,
                          1.0].  See Chapter 1 for details on the
                          internal representation of real numbers.

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

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

MPE/iX 5.0 Documentation