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

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.

Answer 1

[Ramnarayan Krishnamurthy]

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);

There is an elaborate discussion of the above solution at:

https://www.mathworks.com/matlabcentral/answers/25597-how-can-i-save-the-brushed-data-to-a-variable?s_tid=answers_rc1-3_p3_MLT

https://www.mathworks.com/matlabcentral/answers/8147-how-to-brush-data-automatically

A few other approaches that may be applicable to your use case are:

https://www.mathworks.com/matlabcentral/answers/231047-is-it-possible-to-brush-data-on-a-plot-and-have-it-assigned-to-a-variable-immediatly-after-brushing?s_tid=answers_rc1-3_p3_MLT

Of particular interest may be the "Graphical data selection tool" on File exchange.