```Date: Thu, 22 Apr 2004 14:56:17 GMT Reply-To: "(2B) || !(2B) Arin Chaudhuri" Sender: "SAS(r) Discussion" From: "(2B) || !(2B) Arin Chaudhuri" Organization: Road Runner - NC Subject: Re: Unusual sorting problem Content-Type: text/plain; charset=us-ascii; format=flowed Richard A. DeVenezia wrote: > Richard A. DeVenezia wrote: [snip] > The normal sort is not what I want. > I need unusual sort such that rows within each by group of y are be ordered > by x, but the order is ascending and descending depending on y. Y is a > sequence 1,2,3,4... > y=1 x's=-5 to 5 > y=2 x's=5 to -5 > y=3 x's=-5 to 5 > y=4 x's=5 to -5 > ... > > (Think of an old bidirectional dot matrix printer, one line was printed > moving left to right and the next line was printed moving right to left.) > data foo; retain seed 654321; do y = 1 to 38; do x = -5 to 5; satellite = ranuni(seed); disorder = ranuni(seed); output; end; end; run; data bar; set foo; sortvar=(2*mod(y,2)-1)*_n_; run; proc sort data=bar out=sorted_foo(drop=sortvar); by y sortvar; run; ```

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