changing time interval of interest in a dataset

My code below uses my data, and follows the equation Q_i+1 - Q_i/time

The time interval of interest changes as defined by time. However as well as the time interval changing, I want matlab to change the numbers from the data.

When dt = 1: Q_i+1 - Q_i /1

When dt = 2: Q_i+2 - Q_i /2

Whhen dt = 3: Q_i+3 - Q_i /3

And so forth up to the end of the defined time range.

The code below works when time = 1, but im struggling to change the part (M(2:end) - M(1:end)) to follow the rule defined above

time = 1:1:10; %increasing time intervals of interest up to Trw
for a = 1:length(time)
M_s = (M(2:end) - M(1:end))/time(a); %each time step
end 

Answer 1

[Kapil Kumar]

time = 1:1:10;

for a = 1:length(time)

M_s = (M((a+1):end) - M(1:end))/time(a); %each time step

end

If this code is working fine for time=1 then this might help.

[C.G.]

thank you for your repsonse.

When I run this i get the errror: Arrays have incompatible sizes for this operation.

[Kapil Kumar]

ohh that is because the length of time and M are not same. you will have to fix that.

you can define a condition so that for loop can be terminated when 'a' exceeds the length of M.

[C.G.]

I can't fix it as such, because I want it to go up in increasing time intervals through the dataset M.

[Kapil Kumar]

you can use length of M instead of length of time (in line 2)

and also for time you can make length of time same as the length of M

then it will work fine. If there is no time contraints.