Shade an area in a plot between two Y values
显示 更早的评论
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!
采纳的回答
Star Strider
2015-9-16
编辑：Star Strider
2015-9-16
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.
7 个评论
Christoph Meier
2015-9-16
Star Strider
2015-9-16
Simple modification of my previous code:
x = linspace(0, 10, 10);
y = randi(9, 1, 10);
xbars = [2 6];
figure(1)
hp = plot(x, y, 'bp');
hold on
patch([xbars(1) xbars(1), xbars(2) xbars(2)], [min(xlim) max(xlim) max(xlim) min(xlim)], [0.8 0.8 0.8])
plot(x, y, 'bp')
hold off
axis([0 10 0 10])
Again, you will have to modify it to do what you want in your application, but the modifications should be relatively straightforward to do.
Christoph Meier
2015-9-16
Star Strider
2015-9-16
And as always, my pleasure!
jen Magnes
2018-7-11
Thank you! Very helpful!
Star Strider
2018-7-11
As always, my pleasure!
更多回答（2 个）
Narendra Sharma MadanLal Sharma
2017-8-14
0 个投票
Thanks a lot ,Star Strider!
2 个评论
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.
A K M Kamrul Hasan
2020-1-22
0 个投票
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 
3 个评论
Star Strider
2020-1-22
Yes.
A K M Kamrul Hasan
2020-1-22
May I know the necessary commands for that?
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
deltam = interp1(y(x>=pi/2), x(x>=pi/2), Pm) % Calculate Interseection
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.
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.
has been calculated. .
类别
在 帮助中心 和 File Exchange 中查找有关 Annotations 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
