MATLAB: Update tool tip data using data cursor in loop

data cursorMATLABtool tip

Hi all.
I am plotting sevrals of plots all in one figure. I want to use custom tool tip that shows me each plot iteration origin.
but for some reason, when using the tool tip , it shows only the last iteration number on all of the plots.
my code bellow.
what am I dong wrong?
fig=figure;
hold on;
for i=1:4
    x=sort(rand(1,100));
    y=sin(2*pi*x*i);
    txt = ['itr ',num2str(i)];
    plot(x,y,'DisplayName',txt)
    dcm_obj = datacursormode(fig);
    set(dcm_obj,'UpdateFcn',{@myupdatefcn,'itr=',i})
        
end
xlabel('x');ylabel('y');
hold off
legend show
function txt = myupdatefcn(~,event_obj,txt4update,Num)
% Customizes text of data tips
pos = get(event_obj,'Position');
I = get(event_obj, 'DataIndex');
txt = {[txt4update ,': ',num2str(Num)],...
    ['x: ',num2str(pos(1))],...
    ['y: ',num2str(pos(2))]};
end

Best Answer

Found a solution!!
fig=figure;
hold on;
 
for i=1:4
    x=sort(rand(1,100));
    y=sin(2*pi*x*i);
    txt = ['itr ',num2str(i)];
    plot(x,y,'DisplayName',txt)
    dcm_obj =datacursormode(fig);
    set(dcm_obj,'UpdateFcn',{@myupdatefcn,'itr='})
      
end
xlabel('x');ylabel('y');
hold off
legend show
function txt = myupdatefcn(~,event_obj,txt4update)
% Customizes text of data tips
pos = get(event_obj,'Position');
txt = {[txt4update ,': ', event_obj.Target.DisplayName],...
    ['x: ',num2str(pos(1))],...
    ['y: ',num2str(pos(2))]};
end
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