how to take in array last two unit of time (minute,seconds)

 for i=1:4
    for i=1:10
     format shortg
     t=clock;
     t1=t([5,6]);
     t2(i)=t1
end
end

this upper code does not show the value in t2 array ,I wish to store the value t1 in t2 array every iteration i for comparison .

plz suggest me