Summation Evaluation for loops shifting purposes

For the following Summation i am able to evaluate it by hand but the coding in matlab wise i am a little confused as the value of t changes with each iteration i am not able to write i as a normal for loop.

I have a 24x14 Matrix containing X-Data and a 1x14 Matrix containing D-Data

- X represents number of devices and D represents its current usage

- t=24; L=14; (Mathematically t is only true for 3:24 since i need to measure a shift)

Whats happening here is that i am measuring the shift in this 2-Dimensional Matrix from time i till time t. Since the value of t is varying from 3 till 24 i cannot write this as a normal for loop, as normal for loops will only count from i=1 till i=t but here my t value is also climbing with each iteration. now how could i approach this in matlab?

Basically X number of devices of type j that are shifted from time i to t.

My attempt is as follows... I believe it is still erroneous and needs a little work

for t=3:1:time-1 % time = 24
    for L=1:1:14
        value(t,L) = x_data(1,k) - x_data(t,L);
        value(t,L) = cD1(t,L) * d(1,L);
    end
end

Many thanks for any advice you could provide me with!

Answer 1

[Walter Roberson]

Using

for l=1:1:t

would be fine. The limits of the inner "for" get re-evaluated each time the "for" is reached by the flow of control from above.

[Sam]

Hi Walter.. Thanks. could you help to clarify a little please.. you are talking about the outer for right? also, i need L to only count from 1 till 14 but if i set L to count from 1 till t, it will then count from 1 till 24.

[Walter Roberson]

I am getting confused because the variable names you are using in your code do not match what is in the diagram.