Example R programs and commands 4. Combinations and permutations # All lines preceded by the "#" character are my comments. # All other left-justified lines are my input. # All other indented lines are the R program output. # Count the number of ways to choose k distinct objects from a list of n: k<-3; n<-5; choose(n,k) [1] 10 # Generate all the possible choices as column vectors: combn(n,k) [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [1,] 1 1 1 1 1 1 2 2 2 3 [2,] 2 2 2 3 3 4 3 3 4 4 [3,] 3 4 5 4 5 5 4 5 5 5