A=[1 2 3 4 5]
for k=2:10
    A(k,:)=k;
end
A

A =

          1.00          2.00          3.00          4.00          5.00


A =

          1.00          2.00          3.00          4.00          5.00
          2.00          2.00          2.00          2.00          2.00
          3.00          3.00          3.00          3.00          3.00
          4.00          4.00          4.00          4.00          4.00
          5.00          5.00          5.00          5.00          5.00
          6.00          6.00          6.00          6.00          6.00
          7.00          7.00          7.00          7.00          7.00
          8.00          8.00          8.00          8.00          8.00
          9.00          9.00          9.00          9.00          9.00
         10.00         10.00         10.00         10.00         10.00