图形对象的父级在parfor中无法读取
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在parfor中，我无法通过 h.Parent() 的方式读取到图形对象的父对象，使用 ancestor(h, "Figure") 方法同样不行，这是为什么？
H = gobjects(3, 1);
figure("Name", "fig1", Visible="off"), H(1) = axes(); plot(1:10);
figure("Name", "fig2", Visible="off"), H(2) = axes(); plot(1:10);
figure("Name", "fig3", Visible="off"), H(3) = axes(); plot(1:10);
% for-loop
for i = 1:3
disp(class(H(i))); % matlab.graphics.axis.Axes
disp(class(H(i).Parent)); % matlab.ui.Figure
disp(class(ancestor(H(i), "figure"))); % matlab.ui.Figure
disp(H(i).Parent.Name); % Fig i
end
% parfor-loop
parfor i = 1:3
disp(class(H(i))); % matlab.graphics.axis.Axes
disp(class(H(i).Parent)); % matlab.graphics.GraphicsPlaceholder, why?
disp(class(ancestor(H(i), "figure"))); % double, why?
disp(H(i).Parent.Name); % error
end
Accepted Answer
Himanshu
on 30 Mar 2023
0 votes
Hello,
As per my understanding, you are facing an error while using "parfor" loop and reading the parent of a graphical object. The error occurs because accessing the properties of the parent figure or working with graphical objects directly is not supported within "parfor" loops.
When using "parfor" in MATLAB, graphical objects behave differently than in a regular "for" loop due to the nature of parallel computing. In a "parfor" loop, MATLAB creates separate worker instances that execute the loop iterations independently and in parallel. Each worker has its own workspace and does not have access to the GUI.
You can refer to the below documentation to understand more about "parfor" loops.
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