Extract brushed data programmatically

Question

Scott Smith 2023-5-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1966569-extract-brushed-data-programmatically

回答： Scott Smith 2023-5-18

采纳的回答： Adam Danz

在 MATLAB Online 中打开

Hi everyone smarter than me, (Upfront--> Can I get some Matlab Engineer/Guru eyes on this ?)

I'm looking to extract exactly WHICH data points have been brushed by the user in a scatter plot.

Clearly this is tracked somewhere, because if you right click the plot you can

Export the brushed data to a variable
Delete brushed/unbrushed points
Copy to the command line

How can I get that list of brushed data programmatically?

My ultimate goal is to brush a linked set of scatter plots, but but a first step is to just select a collection of points, and get a logical selection out again.

I'd like to hook into the pre-built work Matlab engineers have done, rather than home brew a janky and slow version.

Does anyone know where Matlab keeps this secret sauce?

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Here's what I've tried so far

My best guess starting point is using the struct() function to display hidden internal properties of the brush object.

However, despite the new field "ModeHandle", I can't find what I'm after once I've done that.

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Example of my flow:

% make a scatter plot
x = 0.1:0.1:100;
y = sin(x)./x;
scatter(x,y);
b = brush;      % make the brush object
b.Enable = 'on' % enable brushing

Off I go to brush (see photo above)

Now expose the hidden brush object

b2 = struct(b); % Make brush object show all hidden properties

ModeHandle field appears, but I can't seem to find where the brushed points/ properies are.

I've delved deep into ModeHandle, with no luck.

Any help navigating the ModeHandle field would be appreciated.

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Allen 2023-5-18

It looks like this topic has already been covered. See @Yair Altman's answer to the linked post.

https://www.mathworks.com/matlabcentral/answers/1563016-how-to-find-brushed-data

I am also including the link he proivded to his Undocumented Matlab webpage.

https://undocumentedmatlab.com/articles/hidden-hg2-plot-functionality

Scott Smith 2023-5-18

Awesome! Thanks so much! This and the accepted answer have been a big help!

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Answer 1

Adam Danz 2023-5-18

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1966569-extract-brushed-data-programmatically#answer_1238714

To get the coordinates of selected data points, you can follow the example in this answer.

That answer shows that BrushData is a property of the object that has been brushed and contains a logical index of the data points that were selected. You can use this logical index to extract the coordinates from the XData, YData, ZData properties (for most graphics objects).

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Scott Smith 2023-5-18

So helpful. I wish that this was easier to find out/ that "BrushedData" wasn't a hidden property.

Thanks!

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Answer 2

Scott Smith 2023-5-18

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1966569-extract-brushed-data-programmatically#answer_1238994

在 MATLAB Online 中打开

Also as the original poster,

This does in fact work for scatter plots and (I imagine) linked scatter plots where simultaneous brushing is being exceuted properly.

quick example code

x = 0:0.1:100;
y = sin(x)./x;
s = scatter(x,y);
brush on

Then just brush desired data

Finally to get a logical/index of the brushed data

BData = get(s,'BrushData');

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