Individual handles for each plot in a loop

I am preparing a GUI where I want to plot 2-30 different plots in a axes, and I want to add a number to each plot inside a loop iteration.

Here is my code which give me one handle (handles.handle_plotCD1), but I want handles.handle_plotCD1, handles.handle_plotCD2, handles.handle_plotCD3 etc:

set(handles.axes1, 'NextPlot', 'add');
for cd=1:length(plotdata)
    handles.handle_plotCD1 = plot(plotdata{cd,1}(:,1),plotdata{cd,1}(:,4),'visible','off','LineWidth',2, ...
                            'color', [0 0 0],'linestyle', '--', 'parent', handles.axes1);    
end

How do I do this???

[Stephen23]

"but I want handles.handle_plotCD1, handles.handle_plotCD2, handles.handle_plotCD3"

It is much simpler to put data into an array using indexing than to create dynamic fieldnames. Rather than magically trying to force the indexing into some strings and then use them as fieldnames, why not just use that de-facto index as... a real index ?

Answer 1

[OCDER]

I would avoid using handle_plotCD1, handle_plotCD2, BUT, this can be done via something call dynamic field names . Here are 4 options to choose from:

 set(handles.axes1, 'NextPlot', 'add');
 for cd = 1:length(plotdata)
    %Option 1: use dynamic field names
    handles.([handle_plotCD num2str(cd)]) = plot(plotdata{cd,1}(:,1),plotdata{cd,1}(:,4),'visible','off','LineWidth',2, ...
                                            'color', [0 0 0],'linestyle', '--', 'parent', handles.axes1);

    %Option 2: use a cell array to store handles
    handles.handle_plotCD{cd} = plot(plotdata{cd,1}(:,1),plotdata{cd,1}(:,4),'visible','off','LineWidth',2, ...
                                'color', [0 0 0],'linestyle', '--', 'parent', handles.axes1);    

    %Option 3: use a graphic object array to store handles
    handles.handle_plotCD(cd) = plot(plotdata{cd,1}(:,1),plotdata{cd,1}(:,4),'visible','off','LineWidth',2, ...
                                'color', [0 0 0],'linestyle', '--', 'parent', handles.axes1); 

    %Option 4: Don't store the plot handles, as you can access them via handles.axes1
    %Ex1: handles_plotCD = get(handles.axes1, 'children');
    %Ex2: handles_plotCD = findobj(handles.axes1, 'type', 'line');

    %Make sure to use hold to save your lines, otherwise you'll replace previous handle and get deleted handle error
    if cd == 1
        hold(handles.axes1, 'on')
    elseif cd == length(plotdata)
        hold(handles.axes1, 'off');
    end
 end

[Stephen23]

Option three is the best.

[JB]

Thanks a lot Donald Lee for this great answer. I am going with option three, also pointed out by Stephen Cobeldick. Thanks guys...