How can I create a plot with two y-axis such that the left axis has a linear scale and right axis has a log scale in MATLAB?

I want to be able to create a plot with two Y-Axes such that one of them is linear and the other is logarithmic.

Answer 1

[MathWorks Support Team]

Two Y-axes result from the PLOTYY function. These axes are independent of each other. Each of their properties can be set using the 'YAxisLocation' property associated with the axes created using PLOTYY.

There are two possible use cases for this issue:

1. Multiple figure windows, each with one plot

2. Single figure window with multiple subplots

1. Use Case 1:

close all;

x1 = 1:10;

y1 = 1:10;

y2 = 1:10;

for i=1:3,

     figure(i); 

     plotyy(x1,y1,x1,y2);

end

rax = findall(0, 'YAxisLocation','right');

lax = findall(0, 'YAxisLocation','left');

set(lax,'Yscale','linear','box','off');

set(rax,'Yscale','log','box','off');

2. Use Case 2:

x1 = 1:10;

y1 = 1:10;

y2 = 1:10;

close all;

figure;

for i=1:3,

      subplot(3,1,i)

      plotyy(x1,y1,x1,y2)

end

rax = findall(0, 'YAxisLocation','right');

lax = findall(0, 'YAxisLocation','left');

set(lax,'Yscale','linear','box','off');

set(rax,'Yscale','log','box','off');