Help with CVX formulation without for loop

3

Hi,
I have two questions about vectorizing the for loops in cvx. I would really appreciate any help.

q1) I vectorize the following for loop as bellow but in running I get the error “Operands to the || and && operators must be convertible to logical scalar values.” could any one help me?

for m_index=1 : U       
  c1_=0;
  for b= 1 : S
     for k= 1 : C
         c1_= c1_ + ULA(b,m_index,k);
     end
  end
 c1(m_index)=c1_;

end

vectorized constraint:

variables ULA(S,U,C)
expressions c1(1,U)
m_index=1 : U;
c1=sum(ULA(:,m_index,:),[1 3]); %debugger stop here!

q2) I would appreciate your help to vectorize this code. I have read the How to vectorize most constraint loops in CVX thread, but I don’t figure out how to do that for bellow code:

for b=1 : S       
    for n= 1 : D
        for k= 1 : C
            I_BU= 0;
            for bb= 1 : S
                if ( bb ~= b )
                    for nn= 1 : D
                        if (nn ~= n)
                                I_BU= I_BU + X(bb)* DL_p_t(bb,nn,k)* (G_bd(bb,n,k)/temp);
                        end
                    end
                end
            end
            C(b,n,k)=I_BU;
        end
    end 
end

Here, X, G_bd, DL_p_t are matrices with dimension of 1*S and S*D*C, S*D*C respectively. DL_p_t is the only cvx variable.

Thanks in advance.