Hi, I hope someone can help me.
I need to enumerate all combinations of 36 from 42 in SAS IML. I have the loops as such:
do i = 1 to ns-1;
do j = i+1 to ns;
do m = j+1 to ns;
do n = m+1 to ns;
Options[k,1] = i;
Options[k,2] = j;
Options[k,3] = m;
Options[k,4] = n;
Options[k,5] = o;
k=k+1;
end;
end;
end;
end;
Which gives all combinations of 4 from the 42. Is there an easier way for SAS to do this for me rather than adding in so many do loops?
I need this for an allocation problem in which I am looking for the optimal assignment of swimmers to relay teams.
Thank you
Use the ALLCOMB function:
proc iml;
n=comb(42,36); /* how many rows will you get? */
print n;
v = allcomb(42,36); /* create n x 36 matrix */
print (v[1:5,]); /* print first 5 rows */
For details and other examples in IML, see
Generate combinations in SAS - The DO Loop
For DATA step, see
use function ALLCOMB.
n = 4; k = 2; c = allcomb(n, k); print c;
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