```Date: Mon, 1 Oct 2001 12:36:44 -0700 Reply-To: Dale McLerran Sender: "SAS(r) Discussion" From: Dale McLerran Subject: Re: SAS/IML manipulating subscripts Comments: To: philippe.guiblin@ons.gov.uk Content-Type: text/plain Philippe, Here is a little program which demonstrates one method of selecting a subset. There are other ways, and I do not claim that the method demonstrated is in any way optimal. proc iml; /* generate a vector to sample from */ x = (1:5)`; /* determine size of vector */ N = nrow(x); /* nonzero values of vector VECUSE are rows to be selected */ vecuse = (1:n)`#(x^=3); /* Sort VECUSE returns nonselected (0) values at front */ cvecuse = vecuse; vecuse[rank(vecuse),] = cvecuse; /* determine start value of first nonzero element */ begin = sum(vecuse=0) + 1; /* Get subset of X using nonzero subset of vecuse */ xsubset = x[vecuse[begin:n,],]; print xsubset; quit; Alternatively, you could count the number of observations in your matrix or vector which should go into the subset, initialize the subset matrix or vector using the J function, and loop over the original matrix filling in the next row of the subset matrix if the row of the original matrix is not to be excluded. Dale >Date: Mon, 1 Oct 2001 17:04:07 +0100 >Reply-To: Philippe.Guiblin@ONS.GOV.UK > Philippe Guiblin SAS/IML manipulating subscripts SAS-L@LISTSERV.UGA.EDU >Dear all, > >does anyone know how within SAS/IML I can delete observations. >For example within a data set "dat" containing the variable v1, v2, v3, I >would like to delete >the observations corresponding to the values of v3 equal to 3. > >Thanks for your help. > >Philippe > > > > >For the latest data on the economy and society >consult National Statistics at http://www.statistics.gov.uk > >********************************************************************** >Please Note: Incoming and outgoing email messages >are routinely monitored for compliance with our policy >on the use of electronic communications >********************************************************************** >Legal Disclaimer : Any views expressed by >the sender of this message are not necessarily >those of the Office for National Statistics >********************************************************************** --------------------------------------- Dale McLerran Fred Hutchinson Cancer Research Center mailto: dmclerra@fhcrc.org Ph: (206) 667-2926 Fax: (206) 667-5977 --------------------------------------- ------------------------------------------------------------ --== Sent via Deja.com ==-- http://www.deja.com/ ```

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