Ln

function Ln(const X: Extended): Extended;

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.

Example
TRObject Syntax

var
    float,number : float;
 
 {
 
   number = 2.14;
   float = Ln(number);
   ShowMessage('Ln('+FloatToStr(number)+') = '+FloatToStr(float));
 
   float = Exp(float);
   ShowMessage('Exp(Ln('+FloatToStr(float)+')) = '+FloatToStr(float));
 }

Base Syntax

 var
    float,number : float;
 
 begin
 
   number := 2.14;
   float := Ln(number);
   ShowMessage('Ln('+FloatToStr(number)+') = '+FloatToStr(float));
 
   float := Exp(float);
   ShowMessage('Exp(Ln('+FloatToStr(float)+')) = '+FloatToStr(float));
 end;

Output:

Ln(2,14) = 0,76080582903376
Exp(Ln(2,14)) = 2,14

See Also

• Math Functions