Re: Problem using tlookup bif

[Booth Martin <booth@xxxxxxxxxxxx>]

It looks to me like %TLOOKUPxx uses a binary search, as %lookupxx does.

"Since a binary search is used by the %LOOKUPxx built-in functions for a 
sequenced array, and the correct function of a binary search depends on 
the data being in order, the search may only look at a few elements of 
the array. When the array is out of order, the result of a binary search 
is unpredictable. "


On 12/16/2010 10:23 AM, Dennis Lovelady wrote:
> The manual refers to both kinds of lookups.  The kind that David is using is
> not of the %TLOOKUPxx set, the nearest I can determine.  The %TLOOKUP BIF
> works by comparing each value starting with 1 and ending when a match is
> found or the end of the table is reached.  Sequence is immaterial.  Or at
> least that's the way it was the first 35 years or so of the language.
>
> Dennis Lovelady
> http://www.linkedin.com/in/dennislovelady
> --
> "A diplomat is a person who can tell you to go to hell in such a way that
> you actually look forward to the trip."
>          -- Caskie Stinnett