MATLAB: Combining the matrix’ values

Question

is there any predefined function let us to combine the values in a matrix example: let A the original matrix

if true
                        A= 1 2 
                           4 5 
                           7 8
end 
the result that i'm loking for is 
if true
                                C= 1 1 1 1 2 2 2 2 
                                   4 4 5 5 4 4 5 5
                                   7 8 7 8 7 8 7 8
end

Answer 1

C = allcomb(A(1,:),A(:,2),A(:,3))'

You can find allcomb (by Jos) on the FEX:

http://www.mathworks.com/matlabcentral/fileexchange/10064-allcomb

Or more generally,

B = mat2cell(A,ones(1,size(A,1)),size(A,2));
C = allcomb(B{:})';