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9.135 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



This document was generated by Frank Heckenbach on May, 10 2002 using texi2html