CALL TANH Routine

Returns the hyperbolic tangent.

Category:	Mathematical
Note:	Argument types for arguments that are updated must match in CALL routines. All argument types must be CHAR, VARCHAR, or NUMERIC. If the argument types do not match, a warning is issued to the log.

Table of Contents

Syntax

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

Required Argument

argument

is numeric.

Restriction	The CALL TANH routine accepts variables only 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, is replaced by the following equation:

$table with 1 row and 1 column , row1 column 1 , t eh n h . open , x sub j , close . equals . fraction epsilon super x sub j end super , minus . epsilon super negative , x sub j end super , over epsilon super x sub j end super , plus . epsilon super negative , x sub j end super end fraction , end table. Click image for alternative formats.$

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

Example

data one;
   x=0.5;
   y=-0.5;
   call tanh(x, y);
   put x= y=;
run;

data one;
   x=0.5;
   y=-0.5;
   call tanh(x, y);
   put x= y=;
run;

The preceding statements produce these results:

x=0.4621171573 y=-0.462117157