How do I call a function within another function AND How do I input known variables in function?

Hello. I want to write below equation in matlab code. in this problem unknown variable is x = optimalsize(0 , 2 , 5, 7, 8 , 9 , 10kW) and others known. BUT I have 3 questions.

1. how to input known variables in this function?
2. how to call Tc function in P function ?
3. how to know which number is optimal size

I tried to write below equation in matlab code. but it doesn't work.

PLEASE, Help me

function [P, Tc] = stfunction(Ppv_rated, x,  G , Gref, Kt, Tref, Tamb)
Tc = @ndfunction;
P = (Ppv_rated * x) * (G/Gref)*(1 + Kt*(Tc - Tref));
    function Tc = ndfunction(Tamb, G)
        Tc =  Tamb + (0.0256 * G);
        disp(P)
    end
end

PLEASE!!!

Answer 1

[Monisha Nalluru]

For the above question

1. The known values are sent into function as parameters
2. The function Tc can be called directly or can be called using function handle

Please refer functions, nested function, anonymous function documentation for better understanding

Since the problem is to find optimal size for different x values. We first need to iterate through x and calculate the Ppv-out

As example

x=[0,2,5,7,8,9,10]; % x-values given 
ppv_out=[]; % output gor each x-value
% declare the ppv_rated,G,Gref,kt,Tref,Tamb 
for i=1:length(x)
    ppv_out(i)=stfunction(ppv_rated,x,G,Gref,kt,Tref,Tamb);
end


function [P] = stfunction(Ppv_rated, x,  G , Gref, Kt, Tref, Tamb)
Tchandle = @ndfunction; % function handle created
Tc=Tchandle(Tamb,G); % Tc value is calculated
P = (Ppv_rated * x) * (G/Gref)*(1 + Kt*(Tc - Tref)); % ppv_out calcuated 
    function Tc = ndfunction(Tamb, G)
        Tc =  Tamb + (0.0256 * G);
    end
disp(P) % display the calcualted P value
end