ATANH

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

Read syntax diagramSkip visual syntax diagramATANH (expression)
expression
An expression that returns a value of any built-in numeric data type (except for DECFLOAT), character-string, or graphic-string data type. A string argument is cast to double-precision floating point before evaluating the function. For more information about converting strings to double-precision floating point, see DOUBLE_PRECISION or DOUBLE. The value must be greater than -1 and less than 1.

The data type of the result is double-precision floating point. If the argument can be null, the result can be null; if the argument is null, the result is the null value.

Example

  • Assume the host variable HATAN is a DECIMAL(10,9) host variable with a value of 0.905148254. 
      SELECT ATANH(:HATAN)
    FROM SYSIBM.SYSDUMMY1
    Returns the approximate value 1.50.