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Date:         Fri, 15 Jan 1999 10:28:06 -0500
Reply-To:     "John T. Jones" <jonesj@PHARMARESEARCH.COM>
Sender:       "SAS(r) Discussion" <SAS-L@UGA.CC.UGA.EDU>
From:         "John T. Jones" <jonesj@PHARMARESEARCH.COM>
Subject:      Re: Reordering variables in a new data set
Content-Type: text/plain; charset="us-ascii"

Thank you John,

I have had problems using this method before though. Do you know what that might be? I wanted to be careful when I suggested the retain staement.

jj

At 03:07 PM 1/15/99 +0000, you wrote: >At 09:15 15/01/99 -0500, John T. Jones wrote: > >>2. data new; >> retain var1 var2; >> set old; >> run; >> Caution: retain will hold last not missing >> value over iterations of missing. >> If have no missing then this is simplest. > >John, the 'caution' is unnecessary - and, in fact, not true. The previous >value of RETAINed variables is only RETAINed until a new value (*even* >'missing') is assigned - e.g. by a SET statement. Despite all the myths and >concerns, there are NO situations in which the code you have written will >not work as intended. The only thing you could do wrong would be to include >a variable in the RETAIN statement that did not exist in the dataset being >SET - but that would merely result in that 'new' variable being added to the >dataset with all values set to missing. > >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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