Matlab - Ejercicio comparacion entre 2 matrices

I = [1   2  3    4    5   6   7   8   9]

Ma=[10  22  3    46   15  64  51  8   90]

Mb=[11  12  43   64   7   71  71  37   34   ]

Z=zeros(1,length(Ma));

Z(2:2:end)=Ma(2:2:end);

for i=1:2:length(Ma)

    if Ma(i)>Mb(i)

        Z(i)=Ma(i);

    else

        Z(i)=Mb(i);

    end

end

Z

I =

     1     2     3     4     5     6     7     8     9

Ma =

    10    22     3    46    15    64    51     8    90

Mb =

    11    12    43    64     7    71    71    37    34

Z =

    11    22    43    46    15    64    71     8    90