Real time counter plot

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

[dpb]

A single default point is likely simply to not be visible --

plot(app.UIAxes,app.Counter,'xk')

should show a black "x" at the x axis value of 1.

[Lola]

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]

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

Answer 1

[Image Analyst]

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

[Lola]

Hi @Image Analyst. I've tried this code but MATLAB throws the error 'Vectors must be the same size' in the line

plot(app.UIAxes,x, allCounts, 'kx-', 'LineWidth', 2, 'MarkerSize', 18);

[Image Analyst]

OK, but you forgot to tell me the sizes!

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[Lola]

There is no size. The counter will start from zero and increment from its current value when the button is pushed

[Image Analyst]

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

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

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

[dpb]

...
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.