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To generate a random permutation of the numbers from 1 to 99,999 This looks to be the level of brilliance I was looking If you are not the intended recipient, you are not authorized to use or disclose this information, and we request that you notify us by reply mail or telephone and delete the original message from your mail system. In my prior research I learned that some commonly used rng algorithms have serious flaws that were only discovered years after they'd made it into common usage.ĭATAKINETICS | Data Performance & OptimizationĮ-mail Notification: The information contained in this email and any attachments is confidential and may be subject to copyright or other intellectual property protection. But since you aren't simulating cut and riffle shuffles, proving that your order of numbers is random really relies on proving that your rng actually produces random numbers. According to theory, for a 52-card deck 7 cut and riffle shuffles have been considered sufficient for most card games. In another way of looking at it, you are testing how well you shuffled a deck of 10,000 (instead of 52) cards. But duplicates were not a problem for this problem. For hash searches of course the order makes no difference. The randomness of the order of the input data caused some cache line thrashing in the binary search which we felt was more realistic than just feeding the data in order. I've needed similar techniques to generate data to test binary search algorithm performance against hash search algorithm performance. The advantage would fewer duplicates (if you think that might affect randomness). The quoted ~30%+ duplicate ratio for the quoted RNG functions seems reasonable.Īnother technique would be to use a rng with a range of say a billion numbers and assign them in order to each of the 10,000 numbers (the same as most previous suggestions) and then sort. > Are you sure that duplicates in the first column don't matter? INREC to add the SEQNUM's as a second column, SORT by first column, OUTREC to select only the second column for output. > You can combine steps 2, 3, and 4 in one SORT execution. Use the numbers in column 2 after sorting as your 99,999 randomly ordered numbers SORT by the first column only and DO NOT specify the EQUALS option. > 2.Ědd a second column using SORT with sequential numbers from 1 to 99999 (use the SEQNUM option). Use either CEERAN0 or FUNCTION RANDOM to generate a column of 99,999 random numbers. > From: IBM Mainframe Assembler List [mailto: On Behalf Of Paul Gilmartin If you have received this communication in error, please notify us immediately by e-mail, and delete the original message. If the reader of this message is not the intended recipient or an agent responsible for delivering it to the intended recipient, you are hereby notified that you have received this communication in error and that any review, dissemination, copying, or unauthorized use of this information, or the taking of any action in reliance on the contents of this information is strictly prohibited.
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The information may also constitute a legally privileged confidential communication. The information contained in this communication (including any attachments hereto) is confidential and is intended solely for the personal and confidential use of the individual or entity to whom it is addressed. Quidquid latine dictum sit, altum videtur. Our greatest danger in life is in permitting the urgent things to crowd out the important. Bette Davis (as character Margo Channing) _All About Eve_1950įurious activity is no substitute for understanding. Kennedyįasten your seat belts, it's going to be a bumpy ride. CEERAN0 and Cobol FUNCTION RANDOM both give sets w/30+% duplicates.Įfforts and courage are not enough without purpose and direction. So I need a set of 99,999 random numbers which are 5 digits and unique, i.e.