my code doesn't get into my If statement

So my code doesn't get into my first if statment for some reason even though it's valid check the screen shot for Counter and Sc values

% function for Perturb and Observe MPPT algorithm

function k_values=P_and_O_Final(sc,Vc,k,RL)
counter=sc-4;
if counter>1 && counter<sc-4
    I_next_1=(Vc(sc+1))/RL;
    I_next_2=(Vc(sc+4))/RL;
    P_next_1=Vc(sc+1)*I_next_1;
    P_next_2=Vc(sc+4)*I_next_2;
    I_actual=(Vc(sc))/RL;    % The input current value in the current cycle
    I_prev_1=(Vc(sc-1))/RL;
    I_prev_2=(Vc(sc-4))/RL;  % The input current value in the previous cycle
    P_actual=Vc(sc)*I_actual;        % to calculate the power value for the current cycle
    P_prev_1=Vc(sc-1)*I_prev_1;
    P_prev_2=Vc(sc-4)*I_prev_2;      % To calculate the power value for the previous cycle
    delta_V= Vc(sc+1)- Vc(sc) ;
    delta_V1=  Vc(sc+4)-Vc(sc);
    delta_P= P_next_1 - P_actual;
    delta_P1= P_next_2 - P_actual;
    delta_V_1= Vc(sc)-Vc(sc-4 );
    delta_V_2= Vc(sc)-Vc(sc-1);
    delta_P_1= P_actual-P_prev_2;
    delta_P_2= P_actual-P_prev_1;
    if  delta_P>0.0001
        if delta_V>0
            k=k-0.00002;
        else
            k=k+0.00002;
        end
    end
    if delta_P1 >0.0001
        if delta_V1>0
            k=k-0.00002;
        else
            k=k+0.00002;
        end
    end
    
    
    
    % delta_P1= [P_actual-P_prev_2,P_actual-P_prev_1]
    %delta_V1=[Vi(z)-Vi(z-2) , Vi(z)-Vi(z-1)]
    %delta_V=Vi(z)-Vi(z-1);         % to calculate the difference between current voltage value and the previous one.
    %delta_P=P_actual-P_prev;           % to calculate the difference between current power value and the previous one.
    %delta_V=[Vi(z)-Vi(z-2), Vi(z)-Vi(z-1), Vi(z)-Vi(z+1),Vi(z)-Vi(z+2)]
    %delta_P=[P_actual-P_prev_2,P_actual-P_prev_1,P_actual-P_next_1,P_actual-P_next_2]
    %  if statment used to ecide whether to increase or decrease duty ratio(k) value
    % depending on voltage and Power  difference values.
    
    
    if delta_P_1<(-0.0001)
        if delta_V_1>0
            k=k+0.00002;
        else
            k=k-0.00002;
        end
        if delta_P_2 <(-0.0001)
            if delta_V_2>0
                k=k+0.00002;
            else
                k=k-0.00002;
            end
        end
    end
    
end


k_values=k % used to store new k in the output
end

Answer 1

[Antonio Ciociola]

The problem seems to be here:

counter=sc-4;
if counter>1 && counter<sc-4

If you set "counter" to "sc-4" the following condition can't be statisfied

counter<sc-4

The problem is that you used the "&&" operator and it means that you need to satisfy both conditions.

[Mahmoud Elaktash]

yeah you're right but how can i fix it ?

[Antonio Ciociola]

This is a more specifc question and it depends on the behaviour that you want to get (the goal of your code/function).

Looking at the code, it seems that you can force the code to go into the if statement if you modify the code like this:

if counter>1 && counter<=sc-4
    

But I'm not sure that is the behaviour that you want to obtain