function connectivity(node_coord, routing_table, dests)%visualize the connectivity of routing path to all the destinationsif size(dests,1)~=1 | size(node_coord,2)~=2  error('wrong format in dests or node_coord');endn = size(node_coord,1);hold onfor dest=dests    reachable = find(routing_table(:,dest));    for i=reachable'      j = routing_table(i,dest);      plot([node_coord(i,1) node_coord(j,1)], [node_coord(i,2), node_coord(j,2)]);    endend