conversion of matrix into vector

I made an algorithm of conversion of a matrix for a vector of column but it just works for the matrix 3*4. I want that it work on is important dimension(size). All the dimensions(size)! How I make? the code :

x=[1 2 3 0;4 5 6 0;7 8 9 0];

y=x(:,1);

m=2;

while m<5

y=[y;x(:,m)];

m=m+1;

end

Answer 1

[Wayne King]

Is this important that you write yourself? Because there is a reshape() function

    x = randn(10,10);
    y = reshape(x,100,1);

If it is important, then just starting from what you have, how about

 x = randn(10,10);
 y=x(:,1);
 m=2;
 while m<= size(x,2)
   y=[y;x(:,m)];
   m=m+1;
 end

[krak]

Thank you for your answer! I have an image (any image) and I want to convert her in a vector of columns! It is the only algorithm which I found! I would like of your help :)

Answer 2

[sammar]

hey krak try this way if that what you want

x=[1 2 3 0;4 5 6 0;7 8 9 0]; >> B = reshape(x.',1,[]);

[krak]

hey sammar , Yes the function reshape, but how I have to use him under matlab? Thank you for your answer:)

Answer 3

[Jim]

Just x(:)