Shade an area in a plot between two Y values

Question

Christoph Meier 2015-9-15

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评论： Star Strider 2023-3-19

采纳的回答： Star Strider

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Dear MATLAB community,

I have a time series plot, and would like to shade specific regions in light grey (transparent).

The time series plot is an economic process, and I would like to shade times of recessions.

That is, I already have the values of the y-axis (the respective start date and end date of a recession), and I already have a nice plot, but I cannot figure out how to add these 'recession shadings'.

In short: I would like to shade an area in a time series plot, and the area is defined as:

X(:)              % all x
Y(y1,y2)          % between y1 and y2

Thank you!

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Answer 1

Star Strider 2015-9-16

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编辑：Star Strider 2015-9-16

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See if this does what you want:

x = linspace(0, 10, 10);
y = randi(9, 1, 10);
ybars = [2 6];
figure(1)
hp = plot(x, y, 'bp');
hold on
patch([min(xlim) max(xlim) max(xlim) min(xlim)], [ybars(1) ybars(1), ybars(2) ybars(2)], [0.8 0.8 0.8])
plot(x, y, 'bp')
hold off
axis([0  10    0  10])

You will have to modifiy it to do what you want, but that should be straightforward. Note the repeated plot call to prevent the patch from hiding it.

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Star Strider 2018-7-11

As always, my pleasure!

Afiq Azaibi 2023-3-17

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In addition to Start Strider's solution, starting in R2023a you can use the xregion and yregion functions:

plot([datetime(2020, 1, 1), datetime(2023, 1, 1)], [1, 2]);

xregion(datetime(2021, 1, 1), datetime(2022, 1, 1));

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Answer 2

Narendra Sharma MadanLal Sharma 2017-8-14

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Thanks a lot ,Star Strider!

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Star Strider 2017-8-14

My pleasure!

Jonathan Bishop 2019-5-24

Didn't spend more than a minute on this so possibly there is more to it, but if using a legend, both the patch and the double call to plot will affect the current spot in the ordered list of plot colors. Set the patch handlevisibility to 'off' and use cla after the first plot, if you don't want to bother dealing with the color order in a more programmatic fashion.

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Answer 3

A K M Kamrul Hasan 2020-1-22

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Hi,

This discussion is about the srea bounded by straight lines. However, is it possible to shade an area in Matlab plot bounded by straight lines and curved lines? (i.e like the attached image) ?

Regards,

Kamrul Hasan

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A K M Kamrul Hasan 2020-1-22

May I know the necessary commands for that?

Star Strider 2023-3-19

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Just seeing this now.

Yes! It is definitely possible.

x = linspace(0, pi);

y = sin(x);

Pm = 0.5;

xPm = interp1(y(x<=pi/2), x(x<=pi/2), Pm) % Calculate Interseection

xPm = 0.5237

deltam = interp1(y(x>=pi/2), x(x>=pi/2), Pm) % Calculate Interseection

deltam = 2.6179

figure

plot(x, y)

Lv1 = (x>=pi/2) & (y>=Pm); % Logical Vector

Lv2 = (x>=xPm) & (x<=pi/2); % Logical Vector

patch([x(Lv1) flip(x(Lv1))], [ones(size(x(Lv1)))*Pm flip(y(Lv1))], 'r' ) % Call 'patch'

patch([x(Lv2) flip(x(Lv2))], [zeros(size(x(Lv2))) ones(size(y(Lv2)))*Pm], 'r') % Call 'patch'

yline(Pm,'-k','P_m', 'LabelHorizontalAlignment','left', 'FontWeight','bold')

text(median(x(Lv2)), Pm/2, 'A_1', 'Horiz','center', 'Vert','top')

text(median(x(Lv1)), (max(y)+Pm)/2, 'A_2', 'Horiz','right', 'Vert','top')

hold on

plot([1 1]*deltam, [0 Pm], '--k')

hold off

It’s worth noting how ‘Lv’ is constructed. It combines the logical values where

and

to create the appropriate bounding region to fill with patch.

Add the other text calls to create text in the appropriate places. The x-axis location for

has been calculated.

.

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