[Overview][Constants][Types][Classes][Procedures and functions][Variables][Index] Reference for unit 'System' (#rtl)

arctan

Calculate inverse tangent

Declaration

Source position: mathh.inc line 73

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

Sin

  

Calculate sine of angle

Cos

  

Calculate cosine 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.
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