How can I change this code to be able to use parfor?

A=randn(5,1);

    parfor i=1:4
    B=randn(3,1);
    for t=1:size(B,1)
             for w=1:size(A,1)
                 if B(t)==A(w)
                     A(w)=A(w)+1;  
                 end
             end
    end
    end

Answer 1

[Matt J]

   A=randn(5,1);
   C=cell(1,4);

      parfor i=1:4

       B=randn(1,3);    
       C{i}=sum(bsxfun(@eq,A,B),2);

      end

   A=A+sum([C{:}],2);

[Matt J]

Better:

    A=randn(5,1);
    C=0;

        parfor i=1:4

         B=randn(1,3);    
         C=C+sum(bsxfun(@eq,A,B),2);

        end

   A=A+C;