Convert cell of matrix into one matrix

Hi, does someone know how can I convert cell A into matrix B as the exameple bellow?

% Where A is:
A{1} = [1 2 3;4 5 6];
A{2} = [7 8 9;10 11 12;13 14 15];
% And B should be:
B = [1 2 3
    4 5 6
    7 8 9
    10 11 12
    13 14 15];

Thank you so much for all your help.

Answer 1

[madhan ravi]

B = cat(1, A{:})

[Alejandro Fernández]

It's perfect! Thank you so much!!!

Answer 2

[Fangjun Jiang]

cell2mat()

[Alejandro Fernández]

You may have seen it before I edited the response. I had posted an example that wasn't the right one.

[Fangjun Jiang]

It's a matter of cell2mat(A) or cell2mat(A'). It's better to follow a tip to learn something on your own than getting a direct answer.