How to move a marker on a figure?

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Dru 2023-4-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1945594-how-to-move-a-marker-on-a-figure

评论： Dru 2023-4-12

I am trying to make an animation that moves a marker in a circle. I'm having trouble with moving the marker. This is my setup statement

markerhandle = plot(xdata, ydata, 'k.', 'MarkerSize', 36);

This is my statement to move the marker

markerhandle.set('xdata', 'ydata', ...
    'Marker', 'k.', ...
    'MarkerFaceColor', 'r', ...
    'MarkerEdgeColor', 'r', ...
    'MarkerSize', 36);

The second statement returns errors, however, I can make it kinda work by doing markerhandle = plot(ect...). This leaves all of the old markers in the figure and I only want one marker.

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Dru 2023-4-12

编辑：Dru 2023-4-12

在 MATLAB Online 中打开

With this line of code

markerhandle.set(xdata, ydata, ...
                 'Marker', '.', ...
                 'MarkerFaceColor', 'k', ...
                 'MarkerEdgeColor', 'k', ...
                 'MarkerSize', 36);

I recieved this error

Error using matlab.graphics.chart.primitive.Line/set
Invalid parameter/value pair arguments.
Error in ActiveAnimation (line 51)
        markerhandle.set(xdata, ydata, ...

Dru 2023-4-12

在 MATLAB Online 中打开

Updated code that works as expected

        markerhandle.set('Xdata', xdata, 'Ydata', ydata, ...
                         'Marker', '.', ...
                         'MarkerFaceColor', 'k', ...
                         'MarkerEdgeColor', 'k', ...
                         'MarkerSize', 36); 

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Answer 1

Daniel 2023-4-12

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1945594-how-to-move-a-marker-on-a-figure#answer_1214019

There appear to be two problems:

'XData' and 'YData' have to be followed by the actual xdata and ydata for the new point.
Since you specify the marker color separately in this syntax, the 'Marker' value should be '.' rather than 'k.'.

By the way, if you type 'doc markerhandle.set' into the command window after markerhandle is created, it pulls up the line properties, which will help you sort through how each name/value pair should be defined.