Real time counter plot

Question

Lola 2022-9-30

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1815130-real-time-counter-plot

编辑： dpb 2022-10-1

Hi. I am using appdesigner to create a counter. I am trying to plot the values that will be stored in the variable app.Counter in real-time. If the value is increased or decreased the plot must display this with a marker and a line joining from the previous marker. By pressing the pushbutton the app.Counter value is incremented by 1 but I am not seeing anything plotted on the UIAxes. Please assist.

function ButtonPushed(app,event)
       app.Counter=app.Counter+1;
        app.EditField.Value=app.Counter;
         plot(app.UIAxes,app.Counter)
  end

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Lola 2022-10-1

This plots an "x" only on x axis=1. When the count value increases I would like the x-axis value to increase as well. For example when the count is increased there should be another "x" marker added to the plot to show the increase. Is it possible to do this and have a line join the points when the count is being changed

dpb 2022-10-1

I figured something was up...for that look at animatedline and addpoints

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Answer 1

Image Analyst 2022-10-1

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在 MATLAB Online 中打开

Try making an array like

function ButtonPushed(app,event)
    if a.Counter == 0
        allCounts = 0;
    else
        app.Counter=app.Counter+1;
        allCounts(end+1) = app.Counter
    end
    x = 0; % Vertical x's, OR:
    x = 0 : app.Counter; % If you want each x in its own column.
    app.EditField.Value=app.Counter;
    plot(app.UIAxes,x, allCounts, 'kx-', 'LineWidth', 2, 'MarkerSize', 18);
end

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Image Analyst 2022-10-1

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Lola, come on. There is a size. It even told you so. Please invest 2 hours here:

MATLAB Academy - Free 2 hour training

You can find out the sizes in the workspace panel, or by doing this:

size(x)
size(app.Counter)
size(allCounts)

dpb 2022-10-1

编辑：dpb 2022-10-1

在 MATLAB Online 中打开

...
x = 0 : app.Counter; % If you want each x in its own column.

should be

x = 0 : app.Counter-1;  % If you want x on plot to begin at 0
x = 1 : app.Counter;    % If you want x on plot to begin at 1

to account for "off-by-one" error of 1-based arrays and beginning the count with zero instead of one...

This should be easy to verify is the issue with the debugger as @Image Analyst suggested, presuming you used the vector multiple-x option...

However, this would be much simpler with animatedline and addpoints as suggested earlier; no array needed although would need to create the handle to the animated line to begin with on startup/initialization.

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