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Date:         Mon, 27 Apr 1998 11:52:29 -0500
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From:         Interhub Mailer Daemon <support@LANSOFT.QUINTILES.COM>
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240Send-to: mail@mailrout {richard_paterson@yahoo.com} To: SAS-L@QRTPSMTP {SAS-L@AKH-WIEN.AC.AT} 200MCB-options: YNYNANA Date-posted: 27-Apr-98 11:26:41 220Hop-count: 8 200O-C2-Routed-By: IH; received from QRTP; at 27-Apr-98 11:52:10 200O-C2-Routed-By: QRTP; received from QEDI; at 27-Apr-98 11:53:20 200O-C2-Routed-By: QEDI; received from QEDI2; at 27-Apr-98 16:49:38 202C2-ID: FCD05D3681DC0000 200O-C2-Routed-By: QEDI2; received from -Local-; at 27-Apr-98 16:49:01 O-C2-Forwarded-by: RPATERSO@QEDI2 200O-C2-Routed-By: QEDI2; received from QEDI; at 27-Apr-98 16:48:57 200O-C2-Routed-By: QEDI; received from QRED; at 27-Apr-98 16:46:41 200O-C2-Routed-By: QRED; received from QRTP; at 27-Apr-98 16:45:14 200O-C2-Routed-By: QRTP; received from -Local-; at 27-Apr-98 11:26:41 Sender: SAS-L@QRTPSMTP (SAS(r) Discussion) {SAS-L@AKH-WIEN.AC.AT} O-SMTP-Date-posted: 27-Apr-98 11:26:16 -0500 From: MEDISCI@QRTPSMTP (John Whittington) {medisci@POWERNET.COM} Reply-to: MEDISCI @ QRTPSMTP (John Whittington) {medisci@POWERNET.COM} Subject: Re: RE Sorting Arrays Date: 27-Apr-98 9:20:00 -0500 Message-id: C9D05D3601DC0000 O-SMTP-Envelope-From: <owner-sas-l@VM.AKH-WIEN.AC.AT> 200MHS-id: FCD05D3681DC0000 200Via-host: QRTP.QRTP 200O-C2-Serial-Host: QRTP 200O-C2-Serial-No: IAANAAAANM, IAANAAAMIA, IAANAADPJE, IAANAADPJF, IAANAADPJD, IAANAAEAHA, IAANAAEAGO, IAANAAEAGM, IAANAAEAGP, IAANAAEAGN, IAANAPECGC, IAANAPEFMI, IAANAPEJBA, IAANAPEHGN, IAANAPEJKA, IAANAPEJKC

At 10:06 27/04/98 -0400, Micah Roberts wrote:

>Oh yeah - I forgot to mention that the insertion sort algorithm I posted >earlier makes at MOST n-1 passes through the array (where n is the >number of array elements). Since you are sorting each set of elements >for each observation this should have significant performance advantages >in base SAS over the other techniques posted.

Micah, I personally wouldn't be too quick to make that assumpting. In programming terms, the method I posted using the ORDINAL function makes only one pass through the array. The question, then, relates to how efficient is the implicit sort involved in the ORDINAL function - one hopes that it uses something rapid, probably a 'quick sort', which may well mean that my method is faster, overall, that the method using an explicit 'insertion sort'. If I get a chance, I'll run a comparison!

Regards

John

---------------------------------------------------------------- Dr John Whittington, Voice: +44 (0) 1296 730225 Mediscience Services Fax: +44 (0) 1296 738893 Twyford Manor, Twyford, E-mail: medisci@powernet.com Buckingham MK18 4EL, UK mediscience@compuserve.com ----------------------------------------------------------------

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