Need to reset a counter variable in Matlab

Ok so I need to make an array using a for loop that is the following

      [13 14 15]
      [10 11 12]
      [7 8 9]
      [4 5 6]
      [1 2 3]

here's what I have so far. It works but the function could be alot prettier

clc
clear all
m=1;
i=0;
for m=1:15
    i=i+1;
    if m<=3
    matrix(5,i)=m;
    end
    if m>3 && m<=6
    matrix(4,i-3)=m;
        end
        if m>6 && m<=9
    matrix(3,i-6)=m;
        end
        if m>9 && m<=12
    matrix(2,i-9)=m;
        end
        if m>12 && m<=15
    matrix(1,i-12)=m;
        end
    end

I want to get rid of the i-12 etc. by maybe using another for loop that infinitely counts from 1 to three and terminates through a different parameter?

Been fiddling with this one for a while. Any help would be appreciated!