MATLAB: Deleting empty rows in a 3D Cell Array in MatLab

3dcell arrayempty row

I have a large 3D CELL ARRAY (x1) which I have to delete the empty rows. How can I do this?
Example of my cell array (some pieces of the variable):
      val(:,:,1) = 
      [20]    []    []    []    []    []    
      [ 0]    []    []    []    []    []    
      [ 0]    []    []    []    []    []    
      []      []    []    []    []    []   
      (...)
      val(:,:,42) = 
      [ 34225]    [   215]    [    0]    [   0]    [    0]    [    0]      
      [ 85200]    [   545]    [    0]    [   0]    [    0]    [    0]      
      [ 65074]    [   190]    [ 1000]    [   0]    [    0]    [    0]        
      [ 81570]    [  1385]    [ 2475]    [   0]    [    0]    [    0]            
      [ 67236]    [   530]    [  365]    [   0]    [    0]    [    0]        
      [ 61338]    [     0]    [  100]    [   0]    [    0]    [    0]        
      []          []          []         []        []         []                  
      []          []          []         []        []         []                 
      []          []          []         []        []         []
In this case, I want to exclude the 4th row of `(:,:,1)`, the three last rows from `(:,:,42)` and all the others from these variable.
I've tried
    x1(all(all(cellfun((@isempty,x1),2),:,:) = [];
But it gave me this following error:
Error: Expression or statement is incorrect–possibly unbalanced (, {, or [.
PS: I cannot use `"=="` because its a cell array.
Thanks in advance

Best Answer

If you want to be able to remove rows from single "pages", you should use a cell array of cell arrays, e.g.
 A = cell(3, 1) ;
 A{1} = {2, 3, 4; [], [], []; [], 5, []} ;
 A{2} = {9} ;
 A{3} = {2, 3, 4, 5, 6; [], 9, [], [], []; ...
         [], [], [], [], []; [], [], [], [], []} ;
 for k = 1 : length(A)
    id = all(cellfun(@isempty, A{k}), 2) ;
    A{k}(id,:) = [] ;
 end
After execution, we get:
 >> A{1}
 ans = 
    [2]    [3]    [4]
     []    [5]     []
 >> A{2}
 ans = 
    [9]
 >> A{3}
 ans = 
    [2]    [3]    [4]    [5]    [6]
     []    [9]     []     []     []
and you can see that the content of cells of A doesn't need to match in size.
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