MATLAB: Expansion on the Devision of matrix by matrix Q

Question

Can I expand on this,

x = [4; 8; 12; 16; 20];
y = [2 4];
Qa = bsxfun(@rdivide,x,y);

Returns Qa = [2 1; 4 2; 6 3; 8 4; 10 5]

Now if I

Qb = Qa*y;

I don't get four columns but an error. Is there a way to step through each column of 'Qa' and multiply by each entry in 'y'.

Additional Q?

I am slowly building up a function with the above math. I have tried creating an output matrix were the series are in a different order.

Function_Matrix_out = [Qa.series1, x, Qa.series2];

again I return and error. Could you explain where I am going wrong.

Thanks,

AD

Answer 1

Well, you will have to define the order of the columns you want in the result, but

bsxfun(@times, kron(Qa,[1 1]), kron([1 1],y))

or (different column order)

bsxfun(@times, kron([1 1],Qa), kron(y,[1 1]))