Individual handles for each plot in a loop

Question

JB 2017-9-27

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/358660-individual-handles-for-each-plot-in-a-loop

评论： JB 2017-9-28

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???

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Stephen23 2017-9-28

编辑：Stephen23 2017-9-28

"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 ?

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Answer 1

OCDER 2017-9-27

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https://ww2.mathworks.cn/matlabcentral/answers/358660-individual-handles-for-each-plot-in-a-loop#answer_283418

编辑：OCDER 2017-9-27

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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