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Ln - 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 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