MATLAB: How to store data in cell array

Question

 I have 40 folders and each folder having 10 images, I have written one program for reading first five  
 images from 40 folders and stored in one cell array but I got the dimension i.e. 40 X 1 as given below
 40 X 40
 40 X 40
 .
 .
 40 X 40
 but I required the dimension of cell array i.e. 200 X 1 as given below
 1600 X 1
 1600 X 1
 .
 .
 1600 X 1
 function out=load_database()
 % We load the database the first time we run the program.
 persistent loaded;
 persistent w;
 if(isempty(loaded))
    v=zeros(10304,400);
    for i=1:40
        cd(strcat('s',num2str(i)));
        for j=1:5
            a=imread(strcat(num2str(j),'.bmp'));
                 %v(:,(i-1)*10+j)=reshape(a,size(a,1)*size(a,2),1);
            v = imresize(a,[40,40]);
        end
         w=uint8(v);                                                        
        faceData{i}=w;
         cd ..
    end   
end
loaded=1;  % Set 'loaded' to aviod loading the database again. 
out=faceData';

Answer 1

faceData = cell(40,5); % or cell(5,40)
for i=1:40
  for j=1:5
     % ... read v
     w = uint8(v);
     faceData{i,j} = w; % or faceData{j,i} = w;
  end
end
faceData = reshape(faceData,[],1);