Plot a signal, manually brush data range, and generate new variable

Question

Sean Quisenberry 2017-9-26

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https://ww2.mathworks.cn/matlabcentral/answers/358453-plot-a-signal-manually-brush-data-range-and-generate-new-variable

回答： Ramnarayan Krishnamurthy 2017-10-3

I am looking for a means to plot a signal, and have the brush function automatically on. Manually select that data range (mostly the peaks), and then automatically create a new variable (with a predefined name).

I am trying to cut out the select brush data, then right-click the data, select create new variable and type in the new name.

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Answer 1

Ramnarayan Krishnamurthy 2017-10-3

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https://ww2.mathworks.cn/matlabcentral/answers/358453-plot-a-signal-manually-brush-data-range-and-generate-new-variable#answer_284154

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To programmatically implement selecting brush data, saving it to a newly created variable, you can try the following approach:

% Plot Random data
a = plot(rand(10,1));
% Enable Brush
brush on
% Now manually select brush data on the plot using the mouse 
% then run the lines below
% Obtain indices of brushed values
ind = find(get(a, 'BrushData'));
% Obtain x and y brushed values
brush = logical(get(a, 'BrushData'));
xd = get(a, 'XData');
yd = get(a, 'YData');
brushed_x = xd(brush);
brushed_y = yd(brush);