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...calculate the logarithm for a variable base?
Autor: Alexander Schimpf
Homepage: http://www.hitstec.de
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Tip Rating (7):  
     


(*

  --- English ------
  A logarithm function with a variable basis

  --- Deutsch ------
  In Delphi ist die Funktion LN() bekannt, die den
  natürlichen Logarithmus einer Zahl zurückgibt.
  Der natürliche Logarithmus hat die Basis e^1.

  Um den Logarithmus zur varaiblen Basis zu berechnen
  hilft folgende Funktion.

*)

function Log(x, b: Real): Real;
begin
  
Result := ln(x) / ln(b);
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  
ShowMessage(Format('%f', [Log(10, 10)]));
end;

 

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