Ln

Synopsis

     function Ln (x: Real): Real;

or

     function Ln (z: Complex): Complex;

Description

The natural logarith Ln is the logarithm with base e, where e is the Euler number e = Exp (1) = 2.718281828...

Conforming to

The function Ln is defined in ISO 7185 Pascal; its application to complex values is defined in ISO 10206 Extended Pascal.

Example

     program LnDemo;
     var
       z: Complex;
     begin
       z := Cmplx (1, 1);
       z := Ln (z)  { yields Ln (SqRt (2)) + i * Pi / 4 }
                    { since Ln (i * x) = Ln Abs (x) + i * Arg (x) }
     end.

See also