Highlight a Section of a Plot
17 views (last 30 days)
Show older comments
I would like to insert a vertical bar (light blue) from Time = 500 to Time = 650 to highlight that section of the curve. I believe patch is the tool to use. I followed examples provided on MathWorks, but my curve disappears when I use the recommended code. How can I incorporate patch into the code below?
plot(t,B);
xlabel('Time (in days)');
ylabel('Mosquitoes Searching for a Blood Meal');
h_xlabel = get(gca,'XLabel');
set(h_xlabel,'FontSize',14);
h_ylabel = get(gca,'YLabel');
set(h_ylabel,'FontSize',14);
set(gca,'fontName','Helvetica');
hold on;
I know that I should use patch before plotting my curve so that the vertical bar does not cover the curve.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/171142/image.jpeg)
0 Comments
Accepted Answer
Star Strider
on 10 Mar 2018
Try this:
t = linspace(350, 750); % Create Data
y = sin(2*pi*t/200 + 2) .* cos(2*pi*t/300)*0.2 + 0.2; % Create Data
ptchidx = (t >= 500) & (t <= 650); % Area To Shade
figure(1)
plot(t, y)
hold on
patch([t(ptchidx) fliplr(t(ptchidx))], [y(ptchidx) zeros(size(y(ptchidx)))], [0.6 0.4 0.9], 'FaceAlpha',0.3, 'EdgeColor','none')
hold off
grid
6 Comments
Luca Pozzi
on 28 May 2018
Edited: Luca Pozzi
on 28 May 2018
Thank you for the answer @Star Strider, it's very useful, but now here I come with a more complicated question: I would insert a vertical bar, just as the one @A. Kachalia succedeed to have, wherever the derivatives of the two signals in the plot haven't the same sign.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/189071/image.jpeg)
I thought to make a for (with some if inside) so to have in ptchidx all the intervals I'm looking for. Is it right? Is the rest of the code still valid for my purpose? Thank you very much
More Answers (0)
See Also
Categories
Find more on Annotations in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!