Adding multiple patch items to a plot

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barbH
barbH 2020-3-16
编辑： Adam Danz 2020-3-16
Given an array for x axis 'start' indicies and a second array for x axis 'stop' indicies, how can I create shaded patches for the area between each start and stop index?
I tried to combine the two arrays into one matrix and combine with matching min,max y values but it doesnt seem to work well...
Example:
x_start = [43 123 238 374];
x_stop = [57 135 251 394];
% min and max values of the signal
ymin = -20;
ymax = 20;
I would like to create something like this python example I found:
  2 个评论
Ameer Hamza
Ameer Hamza 2020-3-16
Can you give a small example of both indices and what is your required output?
barbH
barbH 2020-3-16
Hi, I edited my question. I hope it makes things clearer..

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采纳的回答

Adam Danz
Adam Danz 2020-3-16
Here's a demo using the rectangel function.
% Create x and y values.
y = rand(1,100);
x = linspace(0,10,100); % or x = 1:numel(y)
plot(x,y)
ylim([-1 2])
% Specify start, stop index values (positive integers)
startStopIdx = [ % [start, stop]
10 25;
40 50;
80 92];
% Convert the index values to rectangle coordinates
yl = ylim();
ylim(yl)
startStopX = x(startStopIdx);
width = startStopX(:,2)-startStopX(:,1);
hold on
arrayfun(@(i)rectangle('Position', [startStopX(i,1),yl(1),width(i),range(yl)], ...
'EdgeColor', 'none', 'FaceColor', [0 1 0 .2]), 1:size(startStopX,1))

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