MATLAB: Determine loop which include cellarrays

Question

z=[1 2 3;4 5 6;7 8 9];
for i=1:3
w{i}=z(:,i)
end

w =

    [3x1 double]    [3x1 double]    [3x1 double]

%I need to extract first row of w{1},w{2} and w{3} inside the loop after w like that;

n{1}=first row of w{1} n{2}=first row of w{2} n{3}=first row of w{3}

Answer 1

z=[1 2 3;4 5 6;7 8 9];
w = cell(3,1);
n = cell(3,1);
for i=1:3
  w{i}=z(:,i);
  n{i}=w{i}(1,:);
end