transparent grey bar on graphs

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HYZ
HYZ le 1 Sep 2022
Hi, I would like to draw a grey bar to emphasize when the signals were triggered like in the picture. Should I use patch function as it will be loop.
thanks for suggestion
.

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Cris LaPierre
Cris LaPierre le 1 Sep 2022
Modifié(e) : Cris LaPierre le 1 Sep 2022
Use patch, and plot the line after the patch.
x=0:.1:5;
y=(x-2).^3;
patch([0 5 5 0],[0 0 4 4],[.75 .75 .75])
hold on
plot(y,x,'LineWidth',2)
hold off
If you do prefer to have a transparent bar, then adjust the FaceAlpha property. Just note that this will also cause a slight change in the color of the patch.
x=0:.1:5;
y=(x-2).^3;
plot(y,x,'LineWidth',2)
patch([0 5 5 0],[0 0 4 4],[.75 .75 .75],'FaceAlpha',0.25,'EdgeColor','none')

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