Why do I receive default error callback warning while running a loop?

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Dru 2023-4-12

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此问题的直接链接

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评论： Dru 2023-4-12

I'm coding a loop that creates a plot with a moving animation. The animation has a pause function (line 64), and I get this warning every iteration of the loop. xdata and ydata are scalar values used to plot the point on the graph.

> In defaulterrorcallback (line 12)

In ActiveAnimation (line 64)

Warning: Error creating or updating Line

Error in value of one or more of the following properties: XData YData

Array is wrong shape or size

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Answer 1

Walter Roberson 2023-4-12

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https://ww2.mathworks.cn/matlabcentral/answers/1945589-why-do-i-receive-default-error-callback-warning-while-running-a-loop#answer_1214024

在 MATLAB Online 中打开

Your animation is extending XData by one (or more) points, and then extending YData by the same number of points, but as different operations. For example,

h = plot(1:10, 1:10)

h =

Line with properties: Color: [0 0.4470 0.7410] LineStyle: '-' LineWidth: 0.5000 Marker: 'none' MarkerSize: 6 MarkerFaceColor: 'none' XData: [1 2 3 4 5 6 7 8 9 10] YData: [1 2 3 4 5 6 7 8 9 10] Show all properties

h.XData(end+1) = 11

h =

Line with properties: Color: [0 0.4470 0.7410] LineStyle: '-' LineWidth: 0.5000 Marker: 'none' MarkerSize: 6 MarkerFaceColor: 'none' XData: [1 2 3 4 5 6 7 8 9 10 11] YData: [1 2 3 4 5 6 7 8 9 10] Show all properties

%XData is now 11 but YData is still 10

h.YData(end+1) = 11

h =

Line with properties: Color: [0 0.4470 0.7410] LineStyle: '-' LineWidth: 0.5000 Marker: 'none' MarkerSize: 6 MarkerFaceColor: 'none' XData: [1 2 3 4 5 6 7 8 9 10 11] YData: [1 2 3 4 5 6 7 8 9 10 11] Show all properties

Warning: Error creating or updating Line
Error in value of one or more of the following properties: XData YData
Array is wrong shape or size

%now they are the same length again

The warning shows up at rendering time.

There are two possible solutions: