It should be as simple as:
for n = 1:N
for t = 2:T
pipiVal(1,n) = pipiC(t,n); % or however you get the phipi-values correspondin to
pivolaC(1,n) = (pipiC(t,n)^2)/T; % the values for which you calculate pivolaC
end
end
Then the plot should be:
plot(pipiVal,pivolaC)
Further, you only save away the pivolaC-value from the last step in the inner loop. The only reason I can think of in a hurry
where you need to loop anyway is if your pipiC-function stores some state-variable that is updated every time the function
is called. That's a dangerously sensitiv programming pattern, in this case it would be better to have a function that accepts an entire vector of t and loops over them. If you don't do anything like that this should be identical:
for n = 1:N
t = T;
pipiVal(1,n) = pipiC(t,n); % or however you get the phipi-values correspondin to
pivolaC(1,n) = (pipiC(t,n)^2)/T; % the values for which you calculate pivolaC
end
HTH
