how to store values in matrix from for loop?

In my code I want to find all the weight, Return and Risk for my portfolio but for loop give me only last result and 'disp()' function is not enough for all the result Here is my code

   z = 100;
percent_change = 1;
n = (z/percent_change)+1;
a = (0:percent_change:z);
b = (0:percent_change:z);
c = (0:percent_change:z);
d = (0:percent_change:z);
for i = 1:(z/percent_change)+1
    for j = 1:(z/percent_change)+1
        for k = 1:(z/percent_change)+1
            for l = 1:(z/percent_change)+1
            if a(i)+b(j)+c(k)+d(l) == z
                p = Portfolio('assetmean', m, 'assetcovar', C, 'lowerbudget', 1, 'upperbudget', 1, 'lowerbound', zeros(size(m)));
                p = setDefaultConstraints(p);
                pwgt = [a(i); b(j); c(k);d(l)];
                [prsk,pret] = estimatePortMoments(p, pwgt);
                disp(pwgt);
                disp([prsk,pret]);
            end
            end
        end
    end
end

Actually I want all the possible portfolio to create frontier ( not just half of it) I'm just started to use matlab for a few months so any tips would really help me. Thankyou

Answer 1

[dpb]

Simply subscript (preallocate to save reallocation dynamically) the desired output variables...

...
ix=0;  % index for cases
for i = 1:n
  for j = 1:n
    for k = 1:n
      for l = 1:n
        if a(i)+b(j)+c(k)+d(l) == z
          ix=ix+1;        % increment the counter
          p = Portfolio('assetmean',   m, 'assetcovar',  C, ...
                        'lowerbudget', 1, 'upperbudget', 1, ...
                        'lowerbound', zeros(size(m)));
          p = setDefaultConstraints(p);
          pwgt{ix} = [a(i); b(j); c(k);d(l)];
          [prsk{ix},pret{ix}] = estimatePortMoments(p, pwgt);
          ...

I don't know anything about what the Financial Toolbox function actually returns but appears to be combination of vectors/arrays possible; hence the outputs are cell arrays containing those elements...

Wonder if there aren't builtin methods to acquire the desired results from the portfolio object itself, though????

[Pimmala Promlarp]

It has just for efficient portfolio but not for all possible portfolio Thankyou for your help It's not work for [prsk{ix},pret{ix}] = estimatePortMoments(p, pwgt); but I think I can adapt on your answer

[dpb]

Yeah, can't concatenate cells into vector via the [] notation...put the combined into a cell array element.