How to quickly update plotted texts in axes?

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Andreas Nord 2021-2-16

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https://ww2.mathworks.cn/matlabcentral/answers/746732-how-to-quickly-update-plotted-texts-in-axes

评论： Andreas Nord 2021-2-16

I am plotting a fairly big amount of patches (100+) together with their 'ids' as strings, in a loop to create an animation.

I am able to update the patches using the set command, since they are all contained in a 1x1 Patch object. I am not able to find something as straight forward for the texts, because they are in a 100x1 array of Text objects.

With a 100x1 array of Text-objects, can I somehow do an array-based update similar to how I can do for my patches (without having to re-plot or loop over each text object)?

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Answer 1

Walter Roberson 2021-2-16

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https://ww2.mathworks.cn/matlabcentral/answers/746732-how-to-quickly-update-plotted-texts-in-axes#answer_624672

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Yes, it is possible, but not well known. I end up having to go back to the reference material every time I try to use it.

t(1) = text(0,0.5,'string1');

t(2) = text(.3,0.5,'string2');

set(t,{'string'},{'test1';'test2'}) %notice the column vector of new values

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Walter Roberson 2021-2-16

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Indirectly. text() has Position, which is a vector of [x y z]. To update the x separately you need to fetch the original data, update the x, and store back the data.

t(1) = text(0,0.5,'string1');

t(2) = text(.3,0.5,'string2');

set(t,{'string'},{'test1';'test2'}) %notice the column vector of new values

P = cell2mat(get(t, 'Position'));

P(:,1) = [0.2; 0.6]; %vector of new x data

P = num2cell(P,2);

set(t, {'Position'}, P)

The get(), transfer to/from cell, and set(), could be simplified to a simple set() if you are changing both x and y data at the same time; just remember to toss a z coordinate (0 if appropriate) in at the same time.

The num2cell() trick might come in handy for you if you have an array of coordinates.

Andreas Nord 2021-2-16