Powerhouse feature with quad integers

[Chris Sharman]

(ref 1019430)

>2) I don't believe that the calculation is safe for all values.

Well, no, neither do I. But will it get the most significant 48+ bits right,
and reliably give zeroes in the rest ? That's what I need assurance on.
I'm hoping it's safe for numbers with only 48 significant bits (+ exponent),
but I'm not absolutely 110% certain, and we're already wearing enough egg here:
for some reason the layman is amused by calculation errors from computers ...
those laymen that aren't demanding blood are anyway ...

I can see that the subtractive calculation is unreliable. I think that the
multiplicative should be safe, given that it's only 48 significant bits for the
largest invoice-numbers (only about 38 at present).
Any number gurus care to comment ?

>3) I don't believe you can calculate an index value in this way. However,
>there's nothing stopping you from splitting it and using segments of an
>index or subitems. PowerHouse gives you the flexibility in retrieval
>specification. You can use the generalized linkage in QUIZ/QTP like this:
>
>ACCESS record1 LINK item1, item2, item3 ... VIAINDEX index
>  TO segment1, segment2, segment3 ... OF record2
>
>This should give you the flexibility of matching up calculated segment
>values. It does require that the index you're linking to has the same
>segment breakdown, but that should not be a problem.

But segmented keys are only supported for string keys aren't they, not numeric?
I don't see how I'd do that.

Thanks,
Chris
_______________________________________________________________________
Chris.Sharman@CCAgroup.co.uk		http://www.ccastat.demon.co.uk/
CCA Stationery Ltd, Eastway, Fulwood, Preston, Lancashire, PR2 9WS.
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