Combinatorial Functions :: SAS/IML(R) 13.1 User's Guide

ALLCOMB	generates all combinations of $n$ elements taken $k$ at a time
ALLCOMBI	see the ALLCOMB function
ALLPERM	generates all permutations of $n$ elements
COMB	returns the number of combinations of $n$ items taken $r$ at a time
FACT	returns the factorial of an integer
GRAYCODE	returns all subsets in a minimal change order
LCOMB	returns the logarithm of the COMB function
LEXCOMB	returns distinct combinations of $n$ variables taken $k$ at a time in lexicographic order
LEXCOMBI	returns combinations of the indices of $n$ objects taken $k$ at a time in lexicographic order
LEXPERK	returns distinct permutations $n$ variables taken $k$ at a time in lexicographic order
LEXPERM	returns distinct permutations of several variables in lexicographic order
LFACT	returns the logarithm of the FACT (factorial) function
LPERM	returns the logarithm of the PERM function
PERM	returns the number of permutations of $n$ items taken $r$ at a time
RANCOMB	returns random combinations of $n$ elements taken $k$ at a time
RANPERK	randomly permutes the values of the arguments, and returns a permutation of $k$ out of $n$ values
RANPERM	returns random permutations of $n$ elements