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    Ln

    Calculate logarithm.

    Declaration

    Source position: mathh.inc line 124

    function Ln(d: ValReal) : ValReal;

    Description

    Ln returns the natural logarithm of the Real parameter X. X must be positive.

    Errors

    An run-time error will occur when X is negative.

    See also

    Name Description
    Exp Exponentiate.

    Example

    Program Example37;

{ Program to demonstrate the Ln function. }

begin
  Writeln (Ln(1));      { Prints 0 }
  Writeln (Ln(Exp(1))); { Prints 1 }
end.