How can I call all element from cell class ?

Let's say:

A : 3x1 cell class
A : 3x1 cell class
A={cell_1   ;   cell_2   ;   cell_3      }
A={[1x2 double];[1x4 double];[1x3 double]}
        cell_1      [999,222]
        cell_2      [444,222,2000,1000] 
        cell_3      [999,9000,1000]

Question: How can I call all element from cell A?

    result=[999;222;444;2000;1000;9000]

Answer 1

[Stephen23]

unique([A{:}].','stable')

Answer 2

[Walter Roberson]

cell2mat(cellfun(@transpose, A, 'uniform', 0))