ATANH scalar function

The ATANH function returns the hyperbolic arc tangent of a number, expressed in radians. The ATANH and TANH functions are inverse operations.

Read syntax diagramSkip visual syntax diagramATANH( numeric-expression)

The schema is SYSIBM.

The argument must be an expression that returns the value of any built-in numeric data type that is not DECFLOAT. The value must be greater than -1 and less than 1. If the argument is not a double precision floating-point number, it is converted to one for processing by the function.

The result of the function is a double precision floating-point number.

The result can be null; if the argument is null, the result is the null value.

Example: Assume that host variable HATAN is DECIMAL(10,9) with a value of 0.905148254. The following statement returns a double precision floating-point number with an approximate value of 1.50: 
   SELECT ATANH(:HATAN)
     FROM SYSIBM.SYSDUMMY1;