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  2. RPG400-L
  3. August 2006

Re: Bsearch for closest match

Jon Paris wrote:


The old LOOKUP op-code was not viable because it wanted to search all of the
elements defined in the DIM.  %LOOKUP however allows you to specify not just
the starting point but also the end point for the search - so it can be
used.


Not really the end point, but the number of elements.  (Which imply each
other, so you weren't wrong, but possibly misleading.)
 

I'm not certain - but I don't think %Lookup will do a binary search when you
use %LookupGE - in which case it will perform at the speed of the old LOOKUP
op-code (i.e. slowly)



It does a binary search for any %Lookupxx if the array is ordered.

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