ACOS¶

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

Signature¶

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

FUNCTION ACOS : ANY_REAL
  VAR_INPUT
    IN : ANY_REAL;
  END_VAR
END_FUNCTION

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

Inputs

Name	Type	Description
`IN`	`ANY_REAL`	Value in the range [-1.0, 1.0].

Outputs

Name	Type	Description
Return value	`ANY_REAL`	The arc cosine of IN in radians, in the range [0, pi]. Same type as IN.

Returns the arc cosine of IN in radians. The input must be in the range [-1.0, 1.0]. The result is in the range [0, pi].

Try it

Source

result := ACOS(REAL#1.0);   (* result = 0.0 *)
value := ACOS(LREAL#0.0);   (* value ~ 1.5707963 *)