How to concatenate two cell arrays in matlab

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MatLab

I have array as
A=cell(4,1);
A=[1;2;3;4];
i have to increase the size of A. i.e to make it 8 for example. when i pad the zeros or simply vertically concatenate the two array(one is A and other is simply e.g B=cell(4,1))
I get the answer like
[4x1 double]
[]
[]
[]
[]
whereas i need output like
1
2
3
4
[]
[]
[]
[]
or if padding zeros then
1
2
3
4
0
0
0
0
plz help me as i need this urgent.. i have tried alot..it works when A matrix is simply an array not a cell array..but in my case i need this for cell array