Set repeated data sets in a SAS data step -



Set repeated data sets in a SAS data step -

suppose have sas dataset looks this:

id x 1 1234 2 2345 3 3456

i need new info set has info set read in (say) 2 times, new variable indicating "replication" is:

id x rep 1 1234 1 2 2345 1 3 3456 1 1 1234 2 2 2345 2 3 3456 2

it of import info read in exact order -- entire initial info set read once, again, etc.

any ideas on efficient way in info step? (in reality info set huge, need read several times, , want avoid sorting.)

i tried this, order of observations in new info set not want:

data foo; set tmp; rep=1; output; set tmp; rep=2; output; run;

if want maintain info step, work described.

data foo; set tmp (in=ina) tmp (in=inb); if ina rep=1; if inb rep=2; run;

sas

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