lnxp1

Return natural logarithm of 1+X

Declaration

Source position: math.pp line 306

function lnxp1(

x: float

):float;

Description

Lnxp1 returns the natural logarithm of 1+X. The result is more precise for small values of x. x should be larger than -1.

Errors

If $x\leq -1$ then an EInvalidArgument exception will be raised.

Example

Program Example20;

{ Program to demonstrate the lnxp1 function. }

Uses math;

begin
  writeln(lnxp1(0));
  writeln(lnxp1(0.5));
  writeln(lnxp1(1));
end.

Notes

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