Parfor: Variable (Ind) is not sliced; Recommendations about my code?

I have the below lines of code and i want to make it with parfor. But i get the folloing message: Parfor cannot run due to the way Ind is used, and the it has minor corrections about the variables using the vector Ind that are not sliced. Any suggestions?

 parfor iel=1:nelm

    inadd=0;

    Hnodes=Element_Table(iel,1:tot_Nods);

    for il=1:z_nodes

        for i_ind=1:tot_Nods;

            hn=Hnodes(i_ind);
            ielN=Element_Table(iel,i_ind+(il-1)*tot_Nods);

            if (ielN>mxH && ielN<mnH);
                DOFS=middofs; else DOFS=HalfDofs; end

            [posf, poslf]=locF(il, z_nodes, totnodes, hn);

            DoFs=1+inadd:DOFS+inadd; idofs=1:DOFS;

            Ind(DoFs)=idofs+posf+poslf;

            inadd=inadd+DOFS;
        end

    end

    Unv(posel,1)=Un(Ind);
    Ubv(posel,1)=Ub(Ind);

    Kvn(Ind)=Kvn(Ind)+   K*Unv;
    Mvn(Ind)=Mvn(Ind)+   M*Unv;
    Mvb(Ind)=Mvb(Ind)+   M*Ubv;

 end

Answer 1

[Matt J]

Ind looks like a temporary variable and therefore needs to be created inside the parfor loop. Also, this kind of accumulation

     Kvn(Ind)=Kvn(Ind)+   K*Unv;
     Mvn(Ind)=Mvn(Ind)+   M*Unv;
     Mvb(Ind)=Mvb(Ind)+   M*Ubv;

has no obvious parallel structure. Perhaps you meant the following

     Kvn(el,Ind)=  K*Unv;
     Mvn(el,Ind)=  M*Unv;
     Mvb(el,Ind)=  M*Ubv;

and then later after the parfor loop,

   Kvn=squeeze(sum(Kvn,1));
   Mvn=squeeze(sum(Mvn,1));
   Mvb=squeeze(sum(Mvb,1));

Answer 2

[Brendan Hamm]

Often times when you run into an error like this, your easiest solution will be to take the inside of the parfor loop and turn it into a function.