Dividing a Matrix with a column vector

Hello everyone.

I am having a problem doing a matrix by vector division. The matrices and vectors are here attached.

The operation would be q_i(10000 X 4)= p_i (10000X4)./P(1X4).

The result should be that each element of the coloumn of p_i have to be divided by the element of P of that column. Thus, giving a result different for each column (equal within the columns since the matrix p_i has this peculiarity). Instead, in my case, the outcome is a matrix 100000X4 whose elements are all equal. I am not able at all in managing this problem. If someone can help me to solve this I would be very grateful.

Thanks!

Lorenzo

Answer 1

[Jan]

The p_i, you have provided, is not [10000 x 4] but [4 x 10000]. When I load the files and run:

q_i = p_i.' ./ P;

I get a [10000 x 4] matrix with different values as expected.

Therefore it is not clear, how you have created your q_i. The problem must be a a location, you did not mention yet.

[the cyclist]

@Jan was quicker to reply. I got exactly what he describes.

[Lorenzo Pinna]

I am sorry to have not specified that this goes in a loop.

Therefore, I am in a loop

for i=1:N N=10000

for t=1:T T=4

and q_i is (TXN), p_i is (TXN) and P is (1XT).

The exact operation is q_i(t,i)=p_i(t,i)./P(t).

Doing this operation the outcome is the matrix q_i attached above.

Effectively, if I do as I described before, the result which I obtain is correct. I would like to obtain the result you get but inside of the loop. with the q_i's numbers equals within the column and different between.

Thanks and sorry for the incovenient