2D Plot with 3 axis

hey i was wondering if somebody knows how to make a 2D plot with 3 axis...with that i mean a normal 2D plot that has two y axis (i.e. the left and right y axis have different scales) and one x-axis?

thanks for youre help

david

Answer 1

[Wayne King]

Have you seen plotyy?

   x = 0:0.01:20;
   y1 = 200*exp(-0.05*x).*sin(x);
   y2 = 0.8*exp(-0.5*x).*sin(10*x);
   [AX,H1,H2] = plotyy(x,y1,x,y2,'plot');

Answer 2

[david scholz]

hey wayne

no i hadnt, thanks alot!

ds

Answer 3

[Ferran Guedea I Ripoll]

I have created a 2D plot with 3 axis thanks to the plotyy command. Now I want to reformat all 3 axis: max, min limits and ticks for the axis. For the x axis and y principal axis I have been able with the basic commands but not for the 2nd Y axis. Any idea? Thank you in advance -Ferran

[Tom Ransegnola]

When you call the plotyy function, you can include output arguments. From the answer above:

x = 0:0.01:20;
y1 = 200*exp(-0.05*x).*sin(x);
y2 = 0.8*exp(-0.5*x).*sin(10*x);
[AX,H1,H2] = plotyy(x,y1,x,y2,'plot'); %include output arguments

You can use these handles to change the properties of the plot eg:

%sets Y limits for axis 1 (left axis) to -300 and 400
%and automatically spaces ticks
set(AX(1),'YLim',[-300 400],'YTickMode','auto')

%sets Y limits for axis 1 (left axis) to -300 and 400
%and automatically spaces ticks  
set(AX(2),'YLim',[-1 1],'YTickMode','auto')

There are many different features you can change for the two axes (AX) and the two plots (H1 & H2). The full list of options can be seen using:

%get list of features for AX(1) - left axis
get(AX(1))

[Devaprasad M]

How to add label for third axis in Plotyy

[Ahmad Khalid]

yyaxis right;

ylabel ('axis-3 label')