MATLAB Answers

shade area between graphs

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Michiel
Michiel on 28 Feb 2015
Commented: Yash Mistry on 20 Jul 2021
I want to shade the area between these graphs
but this certainly does not do the trick:
fill([t t(end:-1:1)],[y1 y2(end:-1:1)],'y')
I also downloaded and tried "jblill"
but that did not seem to amend the outcome so far
  2 Comments
Image Analyst
Image Analyst on 15 Dec 2017
Yes, there were answers below, one of which he accepted though both should work.

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Accepted Answer

Image Analyst
Image Analyst on 28 Feb 2015
Try using fill() instead of area():
x = 1 : 300;
curve1 = log(x);
curve2 = 2*log(x);
plot(x, curve1, 'r', 'LineWidth', 2);
hold on;
plot(x, curve2, 'b', 'LineWidth', 2);
x2 = [x, fliplr(x)];
inBetween = [curve1, fliplr(curve2)];
fill(x2, inBetween, 'g');
  7 Comments
Tom
Tom on 1 Feb 2019
If you have data sets of different lengths in the same figure, I suggest interpolating both datasets in such a way that their x-axes are identical. Since the PLOT function implicitly interpolates the data linearly, this will not change the way your data is displayed.
If you have data that contains NaNs, what do you want to achieve? How should the filling be? Should it stop at discontinuities? Should it act as if the discontinuities aren't there?

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More Answers (3)

Star Strider
Star Strider on 28 Feb 2015
Edited: Star Strider on 28 Feb 2015
Try this:
x = linspace(0,10*pi);
y1 = sin(x);
y2 = cos(x);
figure(1)
plot(x, y1)
hold on
plot(x, y2)
patch([x fliplr(x)], [y1 fliplr(y2)], 'g')
hold off
Experiment with your data to get the result you want.
  6 Comments
Yash Mistry
Yash Mistry on 20 Jul 2021
how can I avoid that?

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Javier Montalt Tordera
Javier Montalt Tordera on 12 Apr 2019
This can be simplified using the function shade (in MATLAB File Exchange).
The syntax for the above problem would be:
shade(t,y1,t,y2,'FillType',[1 2;2 1]);
The FillType option specifies that the area between lines 1 and 2 should be filled, whether 1 is above 2 or the other way round.
  2 Comments
Javier Montalt Tordera
Javier Montalt Tordera on 24 Mar 2020
You should be able to change line color and fill color using the properties 'Color' and 'FillColor', respectively, specified as name-value pairs.

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DETELINA IVANOVA
DETELINA IVANOVA on 4 Apr 2018
I am using this last suggestion by Star Strider to plot error bar shading using patch, but in some cases I get in addition to the shading straight lines (see the third plot at the bottom in the attached figure) I have eliminated the points with NaNs. It seems ok in the other two cases (the upper plots in the same figure). What can be causing this?

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