# How to shade several areas in a plot?

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Malahat Mehraban el 13 de Dic. de 2021
Comentada: Malahat Mehraban el 13 de Dic. de 2021
Hello everyone,
I want to shade some points in a figure. These points are for example 35 in a plot with the length of 600 point. How can I plot these shades in a for loop?
I actually expect to get somthing like the picture that I have attached. I have a figure with three subplots and I want to shade 35 points of these plots.
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Star Strider el 13 de Dic. de 2021
Try this —
x = 210:0.5:227;
y = randn(size(x));
bands = [214 216; 221 223]; % X-Coordinates Of Band Limits: [x(1,1) x(1,2); x(2,1) x(2,2)]
figure
plot(x, y)
hold on
xp = [bands fliplr(bands)]; % X-Coordinate Band Definitions
yp = ([[1;1]*min(ylim); [1;1]*max(ylim)]*ones(1,size(bands,1))).'; % Y-Coordinate Band Definitions
for k = 1:size(bands,1) % Plot Bands
patch(xp(k,:), yp(k,:), [1 1 1]*0.25, 'FaceAlpha',0.5, 'EdgeColor',[1 1 1]*0.25)
end
hold off
This is fully adaptive to the size of the plot limits, requiring only that the ‘bands’ matrix be defined.
I doubt if there is a way to do this without the loop.
.
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Malahat Mehraban el 13 de Dic. de 2021
It was a great solution, Thank you.
Star Strider el 13 de Dic. de 2021
As always, my pleasure!
.

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### Más respuestas (2)

Chunru el 13 de Dic. de 2021
x = 210:.5:218;
y =randn(size(x));
plot(x, y); hold on
yl = ylim;
% Use the patch for the box
patch([212 213 213 212], [yl(1) yl(1) yl(2) yl(2)], [0.3 0.3 0.3], 'FaceAlpha', 0.3 )
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Malahat Mehraban el 13 de Dic. de 2021
Thank you :)

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Voss el 13 de Dic. de 2021
Look into patch or fill, which are different ways to do basically the same thing.
In addition to the x- and y-coordinates of the rectangles you want to add to the plots, you'll need to specify the 'AlphaData' property for the transparency and the 'EdgeColor' property for the red lines around the edges. A list of patch properties is here.
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Malahat Mehraban el 13 de Dic. de 2021
Thanks Benjamin :) the like was informative.

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