nchoosek([1:n],m)

>> m=2

m =

     2

>> n=5

n =

     5

>> nchoosek([1:n],m)

ans =

     1     2
     1     3
     1     4
     1     5
     2     3
     2     4
     2     5
     3     4
     3     5
     4     5