Merge two plots with the same y axis

Hello there,

I have two sets of parameter, x1 and x2 and they both vary with depth. Since the scale span of x1 is different to that of x2, what I want to do is to put the axis of x2 above, as the secondary plot (see fig below). Anyone can help me to fix this?

x1 = 0:0.1:5;
y1 = 0:1:50;
y2 = 0:1:90;
x2 = y2.^0.9;


figure;
subplot(1,2,1)
plot(x1,y1);
ylabel('Depth (m)');
xlabel('Length');

subplot(1,2,2);
plot(x2,y2,'r');
ylabel('Depth (m)');
xlabel('Power');

Please find attached the data, or please access the code above to generate the data.

Thanks

[Adi Purwandana]

Have you tried it? It's for yy axis not the x axis. I read already that link before and I can't manage it. Let me know if you try and have the solution.

[Rik]

A recent question also asked about two x axes in one plot. Where did you search?

Answer 1

[Piyush Kumar]

Hi Adi,

It seems like you want x2 to be plotted against y2 but have its x-axis aligned at the top nd y-axis synchronized with the y1.

x1 = 0:0.1:5; 
y1 = 0:1:50;  
y2 = 0:1:90; 
x2 = y2.^0.9; 

t = tiledlayout(1,1);

% Create the first axes
ax1 = axes(t);
plot(ax1, x1, y1, '-r');
ax1.XColor = 'r'; 
ax1.YColor = 'r'; 

% Create the second axes
ax2 = axes(t);
plot(ax2, x2, y2, '-k', 'Parent', ax2); 
ax2.XAxisLocation = 'top'; 
ax2.YAxisLocation = 'right'; 
ax2.Color = 'none'; 

% Link the y-axes of ax1 and ax2
linkaxes([ax1, ax2], 'y');

ax2.YTick = []; 
% ax2.YColor = 'none'; 
ax1.Box = 'off';
ax2.Box = 'off';

I have tried it almost the same way as it is mentioned in the "Display Data with Multiple x-Axes and y-Axes" section of the link. Also, I have used linkaxes function to synchronize the two y-axis.

[Adi Purwandana]

Super! Thank you Piyush, I really appreciate your help.