What does this script mean?

My proffesor gave use this script but i can not seem to understand what it means.

for i=1:3; 
    % Initialisation pour chaque obligation 
    t=sems(i); c=cpns(i); p=VO(i); g=tauxZC2(sems(i))/2; 
    % Definition de la fonction à minimiser 
    fun = @(x)(c/x*(1-1/(1+x)^t)+VN/(1+x)^t-p)^2; 
    % Minimisation avec taux spot comme premier guess 
    x0=g;  
    [xmin, fval]=fmincon(fun,x0); 
    Y(i)=xmin*2; 
end 
% OUTPUTS TRE en composition semestrielle 
format long 
Y

Answer 1

[Torsten]

What is VN ? Where is the function "tauxZC2" ?

As written, the code tries to find a value of x that minimizes (c/x*(1-1/(1+x)^t)+VN/(1+x)^t-p)^2 for given values of c, t, VN and p.

And don't let your professor see that he/she is your proffesor.

[Charlotte Simard]

The VN is the nominal value and the tauxZC2 is not a function but a variable calculated earlier in the script.

Answer 2

[Matt J]

It means minimize fun(x) over x for each set of fixed parameters t,c,p,VN. The initial guess for the minimization is g. The minimizing point is xmin and Y(i) will store twice the result, 2*xmin.