| 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).
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| Related commands |
| Exp |
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Gives the exponent of a number |
| Log10 |
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Gives the log to base 10 of a number |
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| 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.
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| Hide full unit code |
Ln(2) = 0.693147180559945
Exp(Ln(2)) = 2
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