How to transform an array from n x m into nm x 1?

Hello,

I am quite new and fresh on matlab, had a couple weeks of trial and error with it... Anyways, I have this little problem thats in the way between struggle and finished coursework.

PROBLEM.

Lets say i have a matrix,

A = [1,2,3; 4,5,6; 7,8,9] % dimensions 3x3

DESIRED SOLUTION. Is there an easy way to turn it into:

B = [1;2;3;4;5;6;7;8;9]  % dimensions 9x1

THANK YOU a lot in advance :)

[David Goodmanson]

HI Gediminas, Yes there is. If you use B = A(:), then B is a column vector that is read out columnwise from A, i.e. first column first, second column second, etc. . That gives A = [1;4;7;2;5;8;3;6;9]. But you want A read out rowwise, so you transpose A first:

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

[Gediminas Sadaunykas]

Thanks!!! Perfect.

Answer 1

[James Tursa]

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

or

B = reshape(A.',[],1);

In both cases, the transpose is necessary to get the elements of A to line up in memory in the desired order.