clear
clc

% A=zeros(1,10)
% for i=10:-1:1
%     A(i)=2*i
% end

A=[1 2 3 4; 5 6 7 8]
s=size(A);
s1=s(1);
s2=s(2);

for i=1:2
    for j=1:4
        if A(i,j)>3
            A(i,j)=A(i,j)*10;
        else
            A(i,j)=A(i,j)/4;
        end
    end
end