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  2. RPG400-L
  3. April 2004

Re: %lookup

Lim Hock-Chai wrote:

Does binary search still apply if I pass the start index to %lookup? And doesn't array by default ascending?


Here is what I'm dealing with. I need to load some data in a file to an array and then do a lookup in this array. Because many records are in these file, I, therefore, try to use a number that is big enough to support grow. Of course, the bigger the array, the longer the search. I'm thinking if I can sort it first and then tell lookup to search from the first non blank index, that will reduce the processing time.



First, an array is considered sequenced only if keyword ASCEND or DESCEND is specified on its definition. (The default applies to the SORTA opcode. Unsequenced arrays are sorted by SORTA in ascending order.)

Second, since the data is already in a file, why not just define a logical view of it and use that to search for what you want? That's much easier, and probably faster too.

Cheers! Hans


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