CALL TANH Routine

Returns the hyperbolic tangent.

Category:

Mathematical

Syntax

CALL TANH(argument<, argument,...> );

Required Argument

argument

is numeric.

Restriction

The CALL TANH routine only accepts variables as valid arguments. Do not use a constant or a SAS expression, because the CALL routine is unable to update these arguments.

Details

The subroutine TANH replaces each argument by the tanh of that argument. For example

x_{j}

is replaced by

\begin{matrix} t a n h (x_{j}) = \frac{ε^{x_{j}} - ε^{- x_{j}}}{ε^{x_{j}} + ε^{- x_{j}}} \end{matrix}

If any argument contains a missing value, then CALL TANH returns missing values for all the arguments.

Example: Examples

The following SAS statements produce these results.

SAS Statement	Result
x=0.5; y=-0.5; call tanh(x,y); put x= y=;	x=0.4621171573 y=-0.462117157