Converting a cell array containing more cell arrays with different sizes to one cell matrix

Hi all, how to converting cell array containing more cell array (have different sizes) to one cell matrix? For example:

C=
  {1x1 cell}
  {1x3 cell}
  {1x2 cell}

The matrix size inside the cell array is different, thus I cannot use vertcat or horzcat function. I try to use catpad function, but it only concatenate the cell individually.

  F = {{[0.04,0.2,0.56;0.31,0.67,0.22]},{...
    [6+6j,7+3j,8-6j;6+8j,7-6j,3-3j],...
    [5+6j,8+5j;6+8j,7-6j;5+6j,3-9j],...
    [1-6j,1-5j;1-8j,1+6j;1-6j,1+9j]},{...
    [16+6j,7+3j,8-6j;6+8j,7-6j,3-3j],...
    [5+6j,8+5j;6+8j,7-6j;5+6j,3-9j]}}
  
  dim = 2
for kk = 1:numel(F)
    for ii = numel(F{kk}):-1:2
            for oo = 1:ii-1
                R1 = catpad(dim,F{kk}{:})
                R2 = catpad(dim,F{ii}{:})
                break
            end
    end
end

If I add another cell into the cell F, I get an error. How to do this?

Thank you in advance

Answer 1

[David Hill]

F = {{[0.04,0.2,0.56;0.31,0.67,0.22]},{...
    [6+6j,7+3j,8-6j;6+8j,7-6j,3-3j],...
    [5+6j,8+5j;6+8j,7-6j;5+6j,3-9j],...
    [1-6j,1-5j;1-8j,1+6j;1-6j,1+9j]},{...
    [16+6j,7+3j,8-6j;6+8j,7-6j,3-3j],...
    [5+6j,8+5j;6+8j,7-6j;5+6j,3-9j]}};
G=[F{1},F{2},F{3}]

G = 1×6 cell array
    {2×3 double}    {2×3 double}    {3×2 double}    {3×2 double}    {2×3 double}    {3×2 double}

[NHJ]

Hi David, thank you for your fast response. Initially I do like what you suggest and get the correct output. Then, now I want to have a variable input. This means the input cell may be changing. For example F can be (1x3) cells or (1x4) cells or etc. Did you have any idea?

Thank you in adance

[David Hill]

G={};
for k=1:length(F)
  G=[G,F{k}];
end

[NHJ]

You make the code very simple. Thank you David

[Stephen23]

https://www.mathworks.com/help/matlab/matlab_prog/preallocating-arrays.html