[julia-users] Code running back? what happens?

[paul analyst]

 Code running back? what happens? 
I have a array FS 


julia> println(sum(FS));
9.8267205e7

julia> l,m=size(FS);

julia> FSbis=FS;

julia>

julia>

julia> for i=1:l; #println(i)
           if w[i]==1 us=hcat(F[i,:]',[1:1:m]);
           us=sortrows(us, by=x->x[1],rev=true);
               for j=1:m
                   if in(us[j,2],Su) FSbis[i,us[j,2]]=us[j,2]; break end;
               end;
           end;
       end;

julia>

julia> println(sum(FSbis));
1.03295914e8

julia>

julia> println(sum(FS));
1.03295914e8


after the code array FSbis changing and well. But the array FS too is 
changing! Why? Compare sum(FS) before and after.
Paul