Brush data returns empty 0x0 ogical

Question

Feri 2020-2-29

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/508274-brush-data-returns-empty-0x0-ogical

评论： Feri 2020-3-3

采纳的回答： Divya Gaddipati

在 MATLAB Online 中打开

Hello,

I have been looking around to find a way to automatically save the brushed data, but am stuck at the first step.

Using the following lines:

% find all objects with the property BrushData
 hB = findobj(gcf,'-property','BrushData');
% extract the brush data
data = get(hB,'BrushData');

What I receive is an empty logical output.

Does anyone know how to solve this? I can't use the function in FileExchange "selectdata".

Or any suggestion on how to automatically save the brushed data and exit the brush mode in the current axes?

Thank you in advance.

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Answer 1

Divya Gaddipati 2020-3-3

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/508274-brush-data-returns-empty-0x0-ogical#answer_418249

在 MATLAB Online 中打开

You can refer to the following snippet and modify it according to your need:

x = rand(20,1);
y = rand(20,1);
Handle = scatter(x,y); 
b = brush;
b.Enable = 'on';

After selecting the data, you can get the brushed data using the get command

xd = get(Handle, 'XData');
yd = get(Handle, 'YData');
brush = get(Handle, 'BrushData');
brushed_data_x = xd(logical(brush));
brushed_data_y = yd(logical(brush));
b.Enable = 'off';

Hope this helps!

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Feri 2020-3-3

Excellent, thank you so much.

The way it worked for me was that I had to put a break point, brush the data, the run the rest of the code to collect coordinates. Is the a way that I can do this without the breakpoint? Because I have to implemet this into a GUI.

Thanks a million.

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