[Overview][Constants][Types][Classes][Procedures and functions][Index] Reference for unit 'math' (#rtl)

lnxp1

Return natural logarithm of 1+X

Declaration

Source position: math.pp line 362

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.

See also

ldexp

  

Return (2 to the power p) times x

log10

  

Return 10-Based logarithm.

log2

  

Return 2-based logarithm

logn

  

Return N-based logarithm.

Example

Program Example20;

{ Program to demonstrate the lnxp1 function. }

Uses math;

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

Documentation generated on: Nov 16 2015