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;
Registration is open! SAS is returning to Vegas for an AI and analytics experience like no other! Whether you're an executive, manager, end user or SAS partner, SAS Innovate is designed for everyone on your team. Register for just $495 by 12/31/2023.
If you are interested in speaking, there is still time to submit a session idea. More details are posted on the website.
Learn how to run multiple linear regression models with and without interactions, presented by SAS user Alex Chaplin.
Find more tutorials on the SAS Users YouTube channel.