Dividing a Matrix with a column vector (Inside a Loop)

Hello everyone.

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

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.

The problem is that I don't want that the matrix q_i has the same numbers in each cell. What I want is that each element in the row of the matrix p_i is divided by the P element in the relative row(e.g: The first element of P divides all the 10000 columns of p_i in the first row by itself) . If you do this operation not of in a loop, the result would be correct. Giving a matrix q_i that has the same values within the column and different between columns(As the matrix p_i). I would like to obtain the matrix q_i's with cells equal within the column and different between.

Thanks for the availability

Answer 1

[Cris LaPierre]

First, the syntax of your for loops is incorrect. Declare N and T before writing the for loops. See the examples on this page.

N=10000;
T=4;
for i=1:N  
    for t=1:T  
    end
end

Perhaps more is going on in your code than what you've shared? I get the same result whether I use for loops or elementwise array division. However, the values I get do not match what you have in the q_i variable you have shared.

% manual calculation
p_i(1,1)/P(1)

ans = 6.0098

% for loop result
myq_i(1,1)

ans = 6.0098

% your value
q_i(1,1)

ans = 6.3096