Graph handles in loops

Question

Michael Pilgrim 2020-5-19

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/526540-graph-handles-in-loops

评论： Geoff Hayes 2020-5-19

I am trying to animate several objects at once and can not figure out how to make it work the way I need it to. So far this is the general stucture I have figured out.

What do I need to do different to make this work? Also is there a way to generate the handles without typing them out?

handles = [ "h1", "h2", "h3", ... ];
for j = 1:numObjects
    handles(j) = plot(stuff(1));
end
for i = 2:numSteps
    for j = 1:numObjects
        handles(j) = set(stuff(i));
    end
    pause timeStep
end

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Answer 1

Geoff Hayes 2020-5-19

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https://ww2.mathworks.cn/matlabcentral/answers/526540-graph-handles-in-loops#answer_433395

编辑：Geoff Hayes 2020-5-19

在 MATLAB Online 中打开

Michael - since you have already created the handles with the code

for j = 1:numObjects
    handles(j) = plot(stuff(1));
end

you will then need to update them in your other loop (rather than re-assigning something to the handles array). Try this

for i = 2:numSteps
    for j = 1:numObjects
        set(handles(j),'PropertyName', Value);
    end
    pause timeStep
end

where you need to "fill in" what (one or more) property names and values that you are updating.

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Michael Pilgrim 2020-5-19

Ok, probably should have included this in the question, but I am not even making it out of the first loop.

Error using string

Conversion to string from

matlab.graphics.primitive.Line is not possible.

Error in animateGate (line 60)

h(j) = plotBlochVector(GA(T(1)) * ket);

Geoff Hayes 2020-5-19

在 MATLAB Online 中打开

Michael - sorry, I missed that first line

handles = [ "h1", "h2", "h3", ... ];

There is no need to assign strings here and so that is why there is the error - you have a string array, and then in the loop you are assigning the graphics object handles (which are doubles). Just replace this line with

handles = []; % or handles = zeros(numObjects);

and try again.

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