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function Ln (x: Real): Real; |
function Ln (z: Complex): Complex; |
The natural logarith `Ln' is the logarithm with base e, where e is the Euler number e = Exp (1) = 2.718281828...
The function `Ln' is defined in ISO-7185 Pascal; its application to complex values is defined in ISO-10206 Extended Pascal.
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. |