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ln

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Purpose

Get the natural logarithm of a value.

Synopsis

function ln(r:real):real

Argument

r	Real value the function is applied to. This value must be positive.

Return value

Natural logarithm of the argument.

Example

The following example provides a function for calculating logarithms to any (positive) base:

function logn(base,number: real):real
 if (number > 0 and base > 0) then
  returned:= ln(number)/ln(base)
 else
  exit(1)
 end-if
end-function 

Related topics

exp, log, sqrt.

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