create a struct with empty structs for storing plot handles

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Rebecca Prescott 2016-5-10

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https://ww2.mathworks.cn/matlabcentral/answers/283551-create-a-struct-with-empty-structs-for-storing-plot-handles

编辑： Rebecca Prescott 2016-5-10

Hi

I am trying to find a way of organising 4 plot and subplot handles as they are being used in a timer and need to be persistent, and I thought it might be nicer to have them in a struct so its more organised. But I am having trouble with creating the empty struct so I can add the handles in later. Is it possible or do I just need to have lots of variables floating around?

pltHandles = struct('pltHan1', [], 'pltHan2', [], 'plot1', [], 'plot2', []);
pltHandles.pltHan1 = subplot(2,2,1);
pltHandles.pltHan2 = subplot(2,2,2); 
pltHandles.plot1 = plot(pltHandles.pltHan1, xdat, ydat);
pltHandles.plot2 = plot(pltHandles.pltHan2,xdat, ydat);

I also have been trying another approach using guihandles, but something is going wrong there too.

I initialise my plot with this:

fig = figure('CloseRequestFcn',@my_closereq, 'Tag', 'fig');
pltHandles.pltHan1 = subplot(2,2,1, 'Tag', 'pltHan1'); 
pltHandles.pltHan2  = subplot(2,2,2, 'Tag', 'pltHan2'); 
pltHandles.pltHan3  = subplot(2,2,3, 'Tag', 'pltHan3'); 
pltHandles.pltHan4  = subplot(2,2,4, 'Tag', 'pltHan4'); 
guidata(fig, pltHandles);

Then in another (nested) function (a timer callback), I create the plots once:

pltHandles = guidata(fig);          
pltHandles.plot1 = plot(pltHandles.pltHan1, dat1, dat2, 'Tag', 'plot1');
etc

But this is where I am getting an error: Struct contents reference from a non-struct array object. This reference: pltHandles.pltHan1 in this call to plot are causing the error: plot(pltHandles.pltHan1, dat1, dat2, 'Tag', 'plot1').

Even using persistent variables that are not stored in anything for the handles, that call to plot keeps producing the same error. I have no idea what is causing this. I even got that error by omitting the handle for the subplot and calling it directly underneath the subplot line (plot1 = plot(dat1, dat2, 'Tag', 'plot1'))

I discovered the problem was one of the data coordinates was throwing the error.

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Adam 2016-5-10

What exactly is the problem? The code you posted stores axes and plot handles in a struct. What aspect of it is not what you want?

Rebecca Prescott 2016-5-10

编辑：Rebecca Prescott 2016-5-10

When I ran it I was getting an error. I think it was struct contents reference from a non array object, though it was a while ago now and I can't quite recall. But it wouldn't run. From memory, the plot line caused the error. I've tried another approach that isn't quite working either. I will update the question with it.

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create a struct with empty structs for storing plot handles

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