Variable 'Vec1' is not fully defined on some execution paths.

I am trying to insert each element of two 1x6 matrices into their respective equations within one FOR Loop. However, I get the following error:

Variable 'Vec1' is not fully defined on some execution paths.

Function 'MVDMPC of MSC' (#127.4865.4869), line 181, column 12: "Vec1"

 vnz1=[v1 v2 v3 v4 v5 v6];
 vnz2=[v2 v3 v4 v5 v6 v1];              % vnz1(i) and vnz2(i) are complex numbers.
 
  for i = 1:6     
    v_opt1_k1 = vnz1(i);
    v_opt2_k1 = vnz2(i); 
    
    ia_1_k2 = ia_0_est_k2 - (C2 * real(v_opt1_k1));
    ib_1_k2 = ib_0_est_k2 - (C2 * imag(v_opt1_k1));
    I_1_k2 = sqrt(((ia_1_k2)^2)+((ib_1_k2)^2));
    ia_2_k2 = ia_0_est_k2 - (C2 * real(v_opt2_k1));
    ib_2_k2 = ib_0_est_k2 - (C2 * imag(v_opt2_k1));
    I_2_k2 = sqrt(((ia_2_k2)^2)+((ib_2_k2)^2));
    g1 = sqrt(((ia_1_k2 - ia_ref_k)^2)+((ib_1_k2 - ib_ref_k)^2));
    g2 = sqrt(((ia_2_k2 - ia_ref_k)^2)+((ib_2_k2 - ib_ref_k)^2));
      
    if I_1_k2 > i_max || I_2_k2 > i_max
        sat = inf;
    else
        sat = 0;
    end
    
    g = g1 + g2 + sat;
       
    if g < g_opt
        
        g_opt = g;
        x_opt = i;
        n_sec = i;
        Vec1 = v_opt1_k1;
        Vec2 = v_opt2_k1;
        
    %else       
    %    g_opt = g_opt    
    
    %elseif g >= g_opt        
    %    g_opt = g_opt    
    end
    
 end
 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

 % Store the present value of x_opt
 x_old = x_opt;
 
 VolVec1 = Vec1;
 VolVev2 = Vec2;

What I have tried so far:

• Modification of the the IF Loop of the cost function g (with else and elseif as shown in the code with % sign)............. didn't work.
• Deleting the whole IF Loop of the system constraint "i_max".......... didn't work
• Reallocating the outputs inside and outside the FOR Loop........ didn't work

I do not know to what and where this error could be related.

Any sort of help is appreciated.

Answer 1

[Walter Roberson]

Pre-allocate Vec1 and Vec2 before the for loop, by assigning inf to them.

MATLAB cannot prove that g < g_opt will be definitely be true on some iteration, so it thinks that it is possible that you will go through all of the loops without having assigned to Vec1 .

[Hossein Rouhabadi]

Nice! That works.... I had to put n_sec to inf as well. Thanks a lot Walter.