MATLAB: How to apply multiple in mintutes for loops to 365 days

time scaletime series

I am new in MATLAB and I need a help to calculate resistance growth for a battery for one year and then estimation how many years does need to reach 200% of its initial value. If I have an equation for it in for loop for different uses a day, how can apply those uses in minutes to 365 days?
For example,
for i=1:365 %one year   
    for j=1:720 % using the battery for the half of day (in minutes)

         time_1= ??? % here is the place to link i and j ????
         R_1= x*time_1;%resistance growth for the first use
     end
     for k=721:1440 % using the battery for the half of day (in minutes)
         time_2= ???? %here is the place to link i and k
         R_2= x*time_2;%resistance growth for the second use
     end
end
Any idea which helps will be appreciated. Thank you in advance!

Best Answer

Muapper - so you will need two arrays: one for each minute for every day of the year, and one array for the resistance per day. Something like
 resistanceByMinute = zeros(1440*365,1);
 resistanceByDay    = zeros(365,1);
You would update these arrays in the following manner
 for d=1:365
    for m=1:720
        resistanceValue = ...; % something
        resistanceByMinute((d-1)*1440 + m) = resistanceValue;
    end
    for m=721:1440
        resistanceValue = ...; % something
        resistanceByMinute((d-1)*1440 + m) = resistanceValue;
    end
    resistanceByDay(d) = resistanceByMinute((d-1)*1440 + 1440);
 end
The above assumes that you want the resistance value calculated on the last minute of the day to be the resistance value for the day.
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