Extract brushed data programmatically

2023 5 17
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更新时间：2023 5 18
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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
  1. Export the brushed data to a variable
  2. Delete brushed/unbrushed points
  3. 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?
------------------------------
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.
-------------------------
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
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
Scott Smith 2023-5-18
Awesome! Thanks so much! This and the accepted answer have been a big help!

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Adam Danz
Adam Danz 2023-5-18

1 个投票

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
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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Scott Smith
Scott Smith 2023-5-18

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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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