Functions Delphi

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

Example code : Calculate the exponent of 2 and the natural log of the result
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;

Show full unit code
Ln(2) = 0.693147180559945
Exp(Ln(2)) = 2