Separate graph arrows for two y-axes on the matlab

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In the figure below, the circle arrows are used for two y-axes to indicate which axis the graph follows, how do you do this?

Accepted Answer

Angelo Yeo
Angelo Yeo on 13 Jun 2024
Moved: Angelo Yeo on 29 Aug 2024
To add Sai's answer, you can change the color of annotations like below.
EDIT: Fixed the direction of the second arrow as @Aquatris pointed out.
colors = lines(2);
x = linspace(0,10);
y = sin(3*x);
yyaxis left
plot(x,y)
dim = [.4 .55 .1 .25];
annotation('ellipse',dim, 'Color', colors(1,:))
annotation('arrow',[dim(1),dim(1)-dim(3)/2],[dim(2)+dim(4)/2,dim(2)+dim(4)/2], 'Color', colors(1,:))
z = sin(3*x).*exp(0.5*x);
yyaxis right
plot(x,z)
ylim([-150 150])
dim = [.6 .55 .1 .25];
annotation('ellipse',dim, 'Color', colors(2,:))
annotation('arrow',[dim(1)+dim(3), dim(1)+dim(3)+dim(3)/2],[dim(2)+dim(4)/2,dim(2)+dim(4)/2], 'Color', colors(2,:))

More Answers (1)

sai charan sampara
sai charan sampara on 13 Jun 2024
Hello,
You can try to acheive a similar result by using the "annotations" feature in MATLAB. The following code shows an example for plotting an ellipse and an arrow:
figure
x = linspace(-4,4);
y = x.^3 - 12*x;
plot(x,y)
dim = [.4 .55 .1 .25];
annotation('ellipse',dim)
annotation('arrow',[dim(1),dim(1)-dim(3)/2],[dim(2)+dim(4)/2,dim(2)+dim(4)/2])
The "dim" vector gives the the size and location of the smallest rectangle that encloses the ellipse. The dimensions of the arrow can also be defined separately as per requirement. The values are in normalized units. This can be changed by changing the "Units" property. Here is the link to the documentation for "annotations":

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