DelphiBasics
Ln
Function
Gives the natural logarithm of a number System unit
 function Ln ( Number : Extended ) : Extended;
Description
The Ln function takes an integer or floating point Number and gives the natural logarithm of that number.
 
This is only used for mathematical processing.
 
Ln has the opposite effect to Exp - the exponent of a number. (2.72 raised to that number power).
Related commands
Exp Gives the exponent of a number
Log10 Gives the log to base 10 of a number
 Author links

 Buy Website Traffic at
 Buywebsitetrafficexperts.com

 Buy Proxies at
 Buyproxies.io
 
 Download this web site as a Windows program.




 
Example code : Calculate the exponent of 2 and the natural log of the result
// Full Unit code.
// -----------------------------------------------------------
// You must store this code in a unit called Unit1 with a form
// called Form1 that has an OnCreate event called FormCreate.
 
unit Unit1;
 
interface
 
uses
  // The System unit does not need to be defined
  Forms, Dialogs;
 
type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  end;
 
var
  
Form1: TForm1;
 
implementation
{$R *.dfm} // Include form definitions
 
procedure TForm1.FormCreate(Sender: TObject);

var
  float : Double;
begin
  // Get the natural logarithm of 2
  float := Ln(2);

  // Show this value
  ShowMessage('Ln(2) = '+FloatToStr(float));

  // Get the exponent of this value - reverses the Ln operation
  float := Exp(float);

  // Show this value
  ShowMessage('Exp(Ln(2)) = '+FloatToStr(float));
end;
 
end.
Hide full unit code
   Ln(2) = 0.693147180559945
   Exp(Ln(2)) = 2
 
Delphi Programming Neil Moffatt 2002 - 2017. All rights reserved.  |  Home Page