Superimpose a curve on a a image generated by 'imagesc' command, I need to keep two different Y-axis.

First, I have generated a image plot using the the command 'imagesc' with a data matrix 'A'. I have fixed the Y-axis limits (as it is needed).

Now I have to plot a curve (t) on the same image plot with same X-axis but different Y-axis scale.

Requirement is, the Y-axis corresponding to the image plot should be on left side and the Y-axis corresponding to the curve should be on right side.

>>imagesc(x,y,A); hold on; plot (x,t);

Please give suggestions how to handle axis in this case ?

Thank you ......

Answer 1

[Raghava S N]

Hi prasad,

To create plots with two y-axes, you can make use of the “yyaxis” function in MATLAB. Refer to this link for more information on the “yyaxis” function - https://www.mathworks.com/help/matlab/ref/yyaxis.html.

Use the following lines of code in your script to have the Y-axis corresponding to the image on the left side of the plot and the Y-axis corresponding to the curve on the right side of the plot –

imagesc(x, y, A); 
hold on; 
yyaxis left; 
ylabel('Image Y-axis'); 
% Plot the curve with a different y-axis scale 
yyaxis right; 
plot(x, t) 
ylabel('Curve Y-axis');