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

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Dru
Dru 2023-4-12
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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回答（1 个）

Walter Roberson
Walter Roberson 2023-4-12
Ran in:
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:
  1. use set() to change the XData and YData calls in the same call; or
  2. use animatedline() and addpoints() which is designed for these kinds of situations

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