How to concatenate matrix row wise to get a column vector

I have a matrix

A = [1,2,3,4
     5,6,7,8
     9,10,11,12]

How do I make it into a column vector by concatenating the rows, such that I get B = [1,2,3,4,5,6,7,8,9,10,11,12]

Thanks!

Answer 1

[Image Analyst]

Like this:

AColumnVector = reshape(A', [], 1)

Answer 2

[Star Strider]

Another approach:

B = A';
B = B(:)'

B =
     1     2     3     4     5     6     7     8     9    10    11    12