Date: Thu, 10 May 2001 17:23:45 -0700 "Huang, Ya" "SAS(r) Discussion" "Huang, Ya" Re: Permutations and combinations To: Nalbo multipart/alternative;

Based on an example of proc plan in SAS OnlineDoc:

------------------------------------------------- %let pn=5; %let n=%sysfunc(perm(&pn),best.);

proc plan seed=60359; factors Subject = &n Order = &pn ordered / noprint; treatments Stimulus = &pn perm; output out=pm;

proc sort data=pm out=pm; by Subject Order;

proc transpose data=pm out=pm prefix=n; by subject; var stimulus; id order; run;

data pm; length pa \$&pn; a='ABCDE'; set pm; array nn(*) n:; do i=1 to dim(nn); pa=compress(pa||substr(a,nn(i),1)); end;

options nocenter; proc print; var a pa; run; ------------------------

The SAS System 16:42 Thursday, May 10, 2001 10193

Obs a pa

1 ABCDE CDBEA 2 ABCDE DEBCA 3 ABCDE DABEC 4 ABCDE EABDC 5 ABCDE ADEBC 6 ABCDE ABECD 7 ABCDE BECAD 8 ABCDE DACBE 9 ABCDE ABDEC 10 ABCDE DBCAE 11 ABCDE EBDAC 12 ABCDE DEACB 13 ABCDE ADCBE 14 ABCDE EACDB 15 ABCDE ADBCE 16 ABCDE DEABC 17 ABCDE CEABD ........

Similar could be done for combination.

HTH

Ya Huang

-----Original Message----- From: Nalbo [mailto:nalbo@SPAM_NO.FREEUK.COM] Sent: Thursday, May 10, 2001 3:40 PM To: SAS-L@LISTSERV.UGA.EDU Subject: Permutations and combinations

Hi all,

Requirement: take a series of up to 9 letters and then work out every permutation and output results to a data set for later matching to a much larger data set of values. Code might also have to work out combinations too.

How the hell do I code something to work out combinations ? I can't see any functions as such. Has anyone done anything like that and would you be willing to share your code ? I've had a few abortive attempts but I'm struggling.

Thank you in advance.

Alistair.

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