MATLAB: Covert a cell to multidimensional matrix

Question

I have a 50 X 1 cell array, A, and each cell contains an m x 100 matrix, where m is variable and not the same for each of the cells. I would like to convert this cell array to a 3D matrix, Anew(M,100,50), where M is the first dimension of the matrix with biggest rows, and pad zero for the small matrices. I tried cell2mat but it concatenated the cell into a 2D matrix ([…],100). I also tried:

for ii=1:50
Anew(:,:,ii)=A{ii};
end

but I got

Subscripted assignment dimension mismatch.

error. Does anyone know how it can be done?

Thanks

This is the first 6 cells of A:

A = 
      [ 44x100 double]
      [ 80x100 double]
      [103x100 double]
      [ 96x100 double]
      [ 94x100 double]
      [ 92x100 double]
  .
  .
  .

Answer 1

%------------Example---------------------------
s=arrayfun(@(x) randi(5,randi(5),100),1:5,'un',0)
%---------------the code-------------------------
n=max(cellfun(@(x) size(x,1),s))
m=size(s{1},2)
a=cellfun(@(x) [zeros(n-size(x,1),m);x],s,'un',0)
out=cat(3,a)