ATAN¶

Returns the arc tangent (inverse tangent) of a numeric input.

Signature¶

    ┌─────────┐
IN ─┤  ATAN   ├─ OUT
    └─────────┘

FUNCTION ATAN : ANY_REAL
  VAR_INPUT
    IN : ANY_REAL;
  END_VAR
END_FUNCTION

The return type matches the input type. ATAN accepts REAL, LREAL.

Inputs

Name	Type	Description
`IN`	`ANY_REAL`	The numeric value to compute the arc tangent of.

Outputs

Name	Type	Description
Return value	`ANY_REAL`	The arc tangent of IN in radians, in the range [-pi/2, pi/2]. Same type as IN.

Returns the arc tangent of IN in radians. The result is in the range [-pi/2, pi/2].

Try it

Source

result := ATAN(REAL#0.0);   (* result = 0.0 *)
value := ATAN(LREAL#1.0);   (* value ~ 0.7853982 *)