Delphi Basics : arctan command

DelphiBasics

arctan
Function

The Arc Tangent of a number, returned in radians

System unit

function arctan(const Number Extended):Extended;

Description

The ArcTan function is a mathematical function giving the value in radians of the Arc Tangent of Number.

PI radians

= 180 degrees

Notes

The System unit supports only the following angular functions:

ArcTan
Sin
Cos

Special floating point values INF, -INF yield +PI/2 and -PI/2 respectively.

Related commands

ArcCos		The Arc Cosine of a number, returned in radians
ArcSin		The Arc Sine of a number, returned in radians
Cos		The Cosine of a number
Sin		The Sine of a number
Tan		The Tangent of a number

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Example code : Get the ArcTan of PI/2

var
  float : single;
begin
  // The ArcTan of PI/2 should give 1.0
  float := ArcTan(PI/2);
  ShowMessage('ArcTan of PI/2 = '+FloatToStr(float));
end;

Show full unit code

ArcTan of PI/2 = 1.00388479232788