MATLAB: Split Number into digits adding up to it.

Question

I need to split a number into smaller integers that add up to it.

So 4 -> [0,4],[1,3],[2,2],[3,1],[4,0]

6 -> [0,6],[1,5],[2,4],[3,3]…

I know this can be done with for loops but wanted to see if there is another way.

Answer 1

What about

f = @(n) [0:n; n:-1:0].';

Result

>> f(4)
ans =
     0     4
     1     3
     2     2
     3     1
     4     0
>> f(6)
ans =
     0     6
     1     5
     2     4
     3     3
     4     2
     5     1
     6     0