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 ln()                Return the natural logarithm of a numeric
------------------------------------------------------------------------------
 Declaration
   math.hdr

 Syntax
   func dbl ln extern
   param value dbl eNumber

 Arguments
   eNumber is a numeric expression.

 Return
   The natural logarithm of the passed numeric.

 Description
   The ln() function returns the natural logarithm of eNumber. ln( y )
   returns x where y = exp( x ). In this way the ln() function is the inverse
   of exp().

   Upon function return the value of the __matherror system variable can
   be tested for error values.

 Example
   #define EXAMPLE_MATH
   #include example.hdr

   proc Test_ln
   set fixed on
   ? ln( 10 )                // prints 2.30
   ? exp( ln( 1 ) )          // prints 1.00
   ?
   set fixed off
   ? ln( 10 )
   ? exp( ln( 1 ) )
   ? ln( 10 * 2 )
   ? ln( 2.71 )
   endproc

   proc main
   Test_ln()
   endproc