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For input values between -1 and 1 inclusive, this function returns the angle in radians whose tangent value is the input. This function is the inverse of the tangent function. The value can be a Decimal or Integer literal or a reference to a column containing numeric values.

NOTE: While this function returns values outside of the range -1 <= x <= 1, those values are not considered valid.

For more information on the tangent function, see TAN Function.

arc cotangent:

Input range	Output computation
x>0	`atan(1/x)`
x<=0	`atan(1/x) + PI()`

Numeric literal example:

atan(0.5)

Output: Returns the computation of the arc tangent of 0.5. Output value is in radians.

Column reference example:

atan(X)

Output: Returns the arc tangent of the values in X column.

atan(numeric_value)

Argument	Required?	Data Type	Description
numeric_value	Y	string, decimal, or integer	Name of column, Decimal or Integer literal, or function returning those types to apply to the function

numeric_value

Name of the column, Integer or Decimal literal, or function returning that data type to apply to the function.

Missing input values generate missing results.
Literal numeric values should not be quoted. Quoted values are treated as strings.
Multiple columns and wildcards are not supported.

Required?	Data Type	Example Value
Yes	String (column reference) or Integer or Decimal literal	`0.5`

numeric_value

Example - Trigonometry Arc functions