how to reuse the line after delete or hide

suppose i plot line

BK=line([X,DCH_coord(1)],[Y,DCH_coord(2)],'marker','*','MarkerSize',10); 
BK2=line([XX,DCH_coord(1)],[YY,DCH_coord(2)],'marker','*','MarkerSize',10);

 for i=1:4
%sender to receiver
 set(BK,'color','r','LineWidth',3),pause(.4)
 set(BK,'color','k','LineWidth',3),pause(.4)
 set(BK2,'color','r','LineWidth',3),pause(.4)
 set(BK2,'color','k','LineWidth',3),pause(.4)
delete(BK);                 %for deleting the line 
delete(BK2);                 % for deleting the line
%reverse receiver to sender
 set(BK2,'color','r','LineWidth',3),pause(.4)
 set(BK2,'color','k','LineWidth',3),pause(.4)
 set(BK,'color','r','LineWidth',3),pause(.4)
 set(BK,'color','k','LineWidth',3),pause(.4)
delete(BK2);                 %for deleting the line 
delete(BK);                 % for deleting the line
  end

after deleting first tym in the for loop if i again access BK and BK2 then it show error how to solve it please help me.if not delete then plz give me another solution to hide the lines after sender to receiver part and after receiver to sender.

thanks in advance.

Answer 1

[Walter Roberson]

Set the line Visible property 'on' or 'off'

Answer 2

[Ingrid]

try setting the linestyle to none so that the line becomes invisible instead of deleting it

than you can still use the handle in a subsequent call, just set the linestyle again to '-' to make it visible