how can i interconnect pso code to mppt code

function duty = MPPT_algorithm(vpv,ipv,delta)

%MPPT CODE

duty_init = 0.1;

%min and max value are used to limit duty between 0 & 0.85

duty_min=0;

duty_max=0.85;

persistent Vold Pold duty_old;

%persistent variable type can be stored the data

%we need the old data by obtain difference between old and new value

if isempty(Vold)

Vold = 0;

Pold = 0;

duty_old = duty_init;

end

P=vpv*ipv;%power

dV = vpv - Vold;%difference between old and new voltage

dP = P - Pold;%difference between old and new power

%the algorithm is below search the dP/dV=0

%if the derivative=0,duty will not change

%if old and new power not equal & pv voltage bigger than 30v

%the algorithm will works

if dP ~= 0 && vpv>30

if dP < 0

if dV < 0

duty = duty_old - delta;

else

duty = duty_old + delta;

end

else

if dV < 0

duty = duty_old + delta;

else

duty = duty_old - delta;

end

end

else

duty = duty_old;

end

%the below if limits the duty between min and max

if duty >= duty_max

duty = duty_max;

elseif duty<duty_min

duty = duty_min;

end

% stored data

duty_old = duty;

Vold = vpv;

Pold = P;