How to extract the result after each iteration while using for loop?

I am working with nested for loop. My code seems to work. However I need to extract the result after each iteration and finally plot the result with respect to the iteration value . Can anyone help me doing that.

clc
clear all
close all

%parametrs

Fs= 2.16*10^-5*pi;            % Geometrical Factor for sun
Fa=pi;                        % Geometrical Factor for earth
q=1.6*10^-16;                 % Electronic Charge
h= 6.626*10^-34;              % Plancks Constant
c= 3*10^8;                    % Speed of light
K = 8.61*10^-5;               % Boltzmanns Constant
Ts=5760;                      % Temparature of the sun
Ta=300;                       % Ambient Temparature


A=((2*Fs)/((h^3)*(c^2)));
B=((2*Fa)/((h^3)*(c^2)));


%Power Input
Irradiance=@(E) ((q*A).*(E.^2./(exp((E./(K.*Ts))-1))));
Pinput=integral(Irradiance,0,inf);




vdata=0:0.01:1.6;
n=length(vdata);
Jdark=zeros(1,n);


for i=1.55:0.1:3.6
    
    Eg=i;
    Absorbrd_Flux=@(E) ((q*A).*(E.^2./(exp((E./(K.*Ts))-1))));
    Jsc=integral(Absorbrd_Flux,Eg,inf);
    
    for j=0:0.1:1.6
        
        V=j;
        Jd=@(E) ((q*B).*((E.^2./(exp((E-V)./K*Ta)-1))-(E.^2./(exp(E./K*Ta)-1))));
        Jdark=integral(Jd,Eg,inf);
        
        Jv=(Jsc-Jdark);
        Pv=V.*Jv;
        efficiency=Pv/Pinput;
        
    end
    
    Max_Efficiency=max(efficiency)
    
end

    

I need to plot Max_efficiency vs Eg or in this case Max_Efficiency vs i

Answer 1

[Stephen23]

With MATLAB it is almost always better to loop over indices rather than over data values. That makes it easier to save the data in arrays. For example:

Eg_vec = 1.55:0.1:3.6;
Eg_num = numel(Eg_vec);
output = nan(1,Eg_num); % preallocate the output array.
for k = 1:Eg_num
    Eg = Eg_vec(k);
    .. the rest of your code in the loop
    output(k) = max(efficiency);
end
plot(Eg_vec,output)

Avoid i and j as loop iterators, they are already defined as the imaginary unit.

[Md. Golam Zakaria]

Got it. Thank you very much

clc
clear all
close all

%parametrs

Fs= 2.16*10^-5*pi;            % Geometrical Factor for sun
Fa=pi;                        % Geometrical Factor for earth
q=1.6*10^-16;                 % Electronic Charge
h= 6.626*10^-34;              % Plancks Constant
c= 3*10^8;                    % Speed of light
K = 8.61*10^-5;               % Boltzmanns Constant
Ts=5760;                      % Temparature of the sun
Ta=300;                       % Ambient Temparature


A=((2*Fs)/((h^3)*(c^2)));
B=((2*Fa)/((h^3)*(c^2)));


%Power Input
Irradiance=@(E) ((q*A).*(E.^2./(exp((E./(K.*Ts))-1))));
Pinput=integral(Irradiance,0,inf);


Eg_vec = 1.55:0.1:3.6;
Eg_num = numel(Eg_vec);
V_vec = 1.55:0.1:3.6;
V_num = numel(V_vec);

output = nan(1,Eg_num); % preallocate the output array.

for k = 1:Eg_num
    Eg = Eg_vec(k);
    Absorbrd_Flux=@(E) ((q*A).*(E.^2./(exp((E./(K.*Ts))-1))));
    Jsc=integral(Absorbrd_Flux,Eg,inf);
    
    for m=1:V_num
        
        V=V_vec(m);
        Jd=@(E) ((q*B).*((E.^2./(exp((E-V)./K*Ta)-1))-(E.^2./(exp(E./K*Ta)-1))));
        Jdark=integral(Jd,Eg,inf);
        
        Jv=(Jsc-Jdark);
        Pv=V.*Jv;
        efficiency=Pv/Pinput;
        
    end
    
    output (k) = max(efficiency);
end

plot(Eg_vec,output)

[Md. Golam Zakaria]

@Stephen please look at the code again (both yours and mine). The results are coming out different.

[Stephen23]

"The results are coming out different."

Different compared to what? As you were not plotting anything before, I do not understand what you are comparing.

[Md. Golam Zakaria]

never mind. I checked. everything is fine