RE: Compute Hash Code

Hash, molded, cut, packed..........  anyone up for a snack?  LOL.

Ron Power
Programmer
Information Services
City Of St. John's, NL
P.O. Box 908
St. John's, NL
A1C 5M2
Tel: 709-576-8132
Email: rpower@xxxxxxxxxx
Website: http://www.stjohns.ca/
___________________________________________________________________________
Success is going from failure to failure without a loss of enthusiasm. - 
Sir Winston Churchill




Chris_Bougher@xxxxxxxxxxxxx 
Sent by: rpg400-l-bounces@xxxxxxxxxxxx
08/12/2004 04:08 PM
Please respond to
RPG programming on the AS400 / iSeries <rpg400-l@xxxxxxxxxxxx>


To
RPG programming on the AS400 / iSeries <rpg400-l@xxxxxxxxxxxx>
cc

Subject
RE: Compute Hash Code







I have products that are routed to go through a predefined set of steps.
These steps are identified by three character codes. The codes are always
numeric characters. example:

productA 100 - molded, 200 - cut, 300 - packed
productB 100 - molded, 300 - packed

I need to group the products based on this routing but I only want to go 
to
the file once. Since there is no set number of steps I thought computing a
hash was the best way to store the routing in a single field. I wont need
to "expand" this routing back to the parts.

Thanks

Chris Bougher


  
                      "Bob Cozzi"   
                      <cozzi@xxxxxxxxx>         To:       "'RPG 
programming on the AS400 / iSeries'" <rpg400-l@xxxxxxxxxxxx> 
                      Sent by:                  cc:    
                      rpg400-l-bounces@m        Subject:  RE: Compute Hash 
Code 
                      idrange.com   
  
  
                      12/08/2004 02:09   
                      PM   
                      Please respond to   
                      RPG programming on   
                      the AS400 /   
                      iSeries   
  
  




That may work. What do you really need?
If you use Modulus 10, you can get a little better check-digit result.
If you only intend on keeping the "hash" and not the original data, then
the
check-digit is a good idea.

If you want a ciphered hash, then I would just calculate the 16-byte MD5
hash using the cipher MI instruction.

-Bob



-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx]
On Behalf Of Chris_Bougher@xxxxxxxxxxxxx
Sent: Wednesday, December 08, 2004 11:56 AM
To: rpg400-l@xxxxxxxxxxxx
Subject: Compute Hash Code

I need to compute a hash type code for an array of 3 character strings. 
The
strings are always 3 digit numeric values and do not repeat within a
sequence. I was thinking that I could add the numbers together multiplying
by their position in the list. i.e.

array = '100', '200', '300', '400', '500'
hash = (100 * 1) + (200 * 2) + (300 * 3) + (400 * 4) + (500 * 5) = 5500

Does anyone see any issues with this method? Does anyone have a better
method?


Thanks
Chris Bougher


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