How can I adjust the data aspect ratio in a plot with two y axes?

Hi all,

I am trying to create a Walter and Leith climate plot in Matlab. The scale of the right y axis needs to be double that of the left y axis and the numbers on the left axis should align with the numbers on the right axis. When I attempt to change the data aspect ratio Matlab returned: Warning: Only 'auto' DataAspectRatio is supported for axes with multiple coordinate systems. Are there any workarounds to this problem?

Cheers,

John

Answer 1

[Chad Greene]

I'd set the limits of each axis individually, something like this:

% some data: 
t = 1:12; 
T = 20*sin(pi*t/12); 
P = 30*sin(pi*t/12)+5*randn(size(t))+30; 

% Plot the data
[ax,h1,h2]  = plotyy(t,T,t,P); 

% Set the axis limits of the T data: 
set(ax(1),'xlim',[1 12],...
   'ylim',[0 50],...
   'ytick',0:10:50,...
   'ycolor','r')

% Set the color of the T data line: 
set(h1,'color','r','linewidth',2)

% Set the P data color and axis limits: 
set(ax(2),'xlim',[1 12],...
   'ylim',[0 100],...
   'ytick',0:20:100,...
   'ycolor','b')

set(h2,'color','b','linewidth',2)
box off