How to convert a matrix to a vector

Hello , I have a square matrix let M=[1,2,4;6,5,7;8,3,9]. Now I have to convert it into a column vector as. c=[1;2;4;6;5;7;8;3;9]. How to do this? Please help.

Answer 1

[Stephan]

M1=reshape(M.',[],1)