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Date:         Thu, 8 Oct 2009 18:21:15 -0700
Reply-To:     BruceBrad <b.bradbury@UNSW.EDU.AU>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         BruceBrad <b.bradbury@UNSW.EDU.AU>
Subject:      Re: Matrix operations on proc reg output
Comments: To:
Content-Type: text/plain; charset=ISO-8859-1

Thanks Dale

Very useful, I'll try this. I'm sure I would have had great difficulty working out how to do this without your neat example. I've now got this working for a simple dummy test file.

I need to read from two datasets within the do loop. Will the program run faster if I put the Use statements outside the loop and use Setin statements inside the loop?

Thanks Bruce.

> proc iml; > use test; > read all var{"site"} into by_vars; > index = 1:nrow(by_vars); > byvar_begin = uniqueby(by_vars, 1, index); > Nsites = nrow(byvar_begin); > byvar_end = byvar_begin[2:Nsites]-1 // nrow(by_vars); > print byvar_begin byvar_end; > > byvar_ybar = J(Nsites,3,0); > do i=1 to Nsites; > firstobs = byvar_begin[i]; > lastobs = byvar_end[i]; > read point(firstobs:lastobs) var{"y"} into y; > nobs = nrow(y); > ybar = y[:,]; > site = by_vars[firstobs]; > byvar_ybar[i,] = site || nobs || ybar; > end; > print byvar_ybar; > quit; >

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