Using a Variable calculated in a parfor loop

I am calculating the internal forces of the finite elements in a mesh inside a parfor loop:

parfor iel=1:nel
    id_1 = Connect(iel,1); % ID of 1st Node
    id_2 = Connect(iel,2); % ID of 2nd Node
    area = Connect(iel,3); % extract cross-sectional area
    el_disp = [U(gdl_n*id_1-(gdl_n-1):gdl_n*id_1,1); U(gdl_n*id_2-(gdl_n-1):gdl_n*id_2,1)]; % Element Displacement Vector [U_i U_j]
    [qi{iel,1}] = Internal_Forces(id_1,id_2,el_disp,area,mechanical_parameters]; 
end

I am storing the internal forces 'qi' in a cell. This operation is performed correctly, but then I am unable to use the so calculated variable outside such loop (I am trying to use it as the input for a function). Any ideas?

[Edric Ellis]

Are you trying to use the elements of qi outside the loop? That should be fine, what is the problem you're experiencing?

[Alessandro]

Yes, I am. I receive an error saying that the variable cannot be used outside the parfor loop (will give you more details when I get back to work)!

[Walter Roberson]

Does the problem change if you use

      qi{iel,1} = Internal_Forces(id_1,id_2,el_disp,area,mechanical_parameters];

without the []?

Also, in the code you posted you have a carriage return between mechanical_parameters and the ] that follows it.