Reference for package '#rtl'

ArcTan

Calculate inverse tangent

Declaration

Source position: mathh.inc line 109

  function ArcTan(d: ValReal) : ValReal;

Description

Arctan returns the Arctangent of X, which can be any Real type. The resulting angle is in radial units.

Errors

None

See also

Name Description
Cos Calculate cosine of angle
Sin Calculate sine of angle

Example

Program Example4;
{ Program to demonstrate the ArcTan function. }
Var R : Real;
begin
  R:=ArcTan(0);      { R:=0 }
  R:=ArcTan(1)/pi;   { R:=0.25 }
end.