[PD] match the closest number

[Steffen]

I agree this is neat write-up and demonstration Frank made!

On 18/06/2007, at 23.44, danja wrote:

> I will report performance soon, I have rather big lists to go through.

If you have big lists and if matches may occur, then maybe a routine  
that checks if the difference is 0 (i.e. a match) and then just  
output that corresponding number (which is the same as the search  
number) and exit the search right away might be desirable? In this  
case uniqueness is not a problem, naturally.