How to make a array from a loop?

j=0;
for i = 1:1440
    Z(i) = powerConsumption(i) - solarEnergyGenerated(i);
    if (Z(i) < 0) && (j <1200) %Proceed if {Power consumption minus PV is less than 0} and {Battery level is less than 1200kWmin=20kWh}
        j = -Z(i) + j; %Charging
    elseif (Z(i) > 0) && (j>Z(i)) %Proceed if {Power consumption minus PV is more than 0} and {Battery level is more than Z(i)}
        j = j - Z(i); %Discharging
    end
end

I am trying to make a battery algorithm on when to charge and discharge. I am not sure how to make a array of 1440x1 from this loop.

I want to make this array to make a plot out of it.

Answer 1

[M]

You can do something like:

nb = 1440;
j = zeros(1,nb);
Z = zeros(1,nb);
for i = 1 : nb
    Z(i) = powerConsumption(i) - solarEnergyGenerated(i);
    if i > 2 
        j(i) = j(i-1) - Z(i);    
    end
end

You are actally doing the same thing in your 2 conditions "if" and "else".

Then you can plot j and Z :

t = 1 : nb;
plot(t,j);

[Thanathip Boonmee]

clc
clear

X = xlsread('meter_01_year_2009.xls');
powerConsumption= X(1:1440); %Extracting 1 day of data, 1day = 1440min

Y = xlsread('PVBowler2013_365.xls');
solarEnergyGenerated = Y(:,1)/1000; %Extracting column 1 and change Wmin to kWmin

j=0;
for i = 1:1440
    Z(i) = powerConsumption(i) - solarEnergyGenerated(i);
    if (Z(i) < 0) && (j <1200) %Proceed if {Power consumption minus PV is less than 0} and {Battery level is less than 1200kWmin=20kWh}
        j = -Z(i) + j; %Charging
    elseif (Z(i) > 0) && (j>Z(i)) %Proceed if {Power consumption minus PV is more than 0} and {Battery level is more than Z(i)}
        j = j - Z(i); %Discharging
    end
end

Actually this is the full code, I am extracting the datas from excel sheet. I want j to be an array of 1440x1

[Turlough Hughes]

j = -Z(i) + j;

and

j = j - Z(i); % is also j = -Z(i) + j;

are equivalent calculations. So, as M pointed out, there is no need in that case for an if else to decide which of the above lines to implement.

[M]

I want j to be an array of 1440x1

j = zeros(1440,1)

defines a vector of size 1440 x 1.

Then access each element with j(k), with k = 1 , ... , 1440