Dummy y axis?

Hi, I have data as bellow

x = [  0	  1	  2	  3	  4	  5	  6	  7	  8	  9	 10]

V= [0	2	4	6	8	10	12	14	16	18	20]

I=V/0.5;

I wan to plot (x,V), and (x,I) on the same plot, now since both v and I carry same information all I want is to plot only (x,V) and show another Y axis on right corresponding to I.

Think of it as if you plot a variable say pressure (P) with tepmerature (t), plot (t,P) but you want two Y axis representing pressure in two different units say. mbar and torr. Am I able to explain myself?

Answer 1

[Samir]

This is what I wanted, check this file.

Plot two axes - File Exchange.

https://uk.mathworks.com/matlabcentral/fileexchange/7426-plot2axes

Let me know if there is a cleaner native matlab way of doing this.

Best Regards

Samir

Answer 2

[madhan ravi]

doc yyaxis

[madhan ravi]

doc plotyy % for older version of matlab

[Samir]

Cant find.

I dont want two plots, I wont just one data plot (x,V) and two y axis one represents V and other I. not two lines.

[madhan ravi]

First try the solutions suggested and then come back without trying you are wasting your time and others as well upload a sample picture of the desired graph so that it's clear what you are trying to do!

Does the below do what you want if not I have no idea what you want :

yyaxis left
plot(x,V)
ylabel('V')
yyaxis right
ylabel('I')

[Samir]

I havent tried, but this wont get the y tick labels right.

[Samir]

[madhan ravi]

yyaxis left
plot(x,V)
ylim([0 10])
yticks(0:2:10)
xlabel('x')
ylabel('V')
yyaxis right
xlabel('x')
ylabel('I')
ylim([0 20])
yticks(4:4:20)

[Samir]

I understand but this is just an example, the tick labels wont be the same every time. I want the plot to read x and V from the variables which may vary in every iteration and so can I which is supposed to be on the right Y axis. Also the relationship can be complicated then presented. So I wan something similar to plotyy(x,V,x,I) but there is no need for two lines. Jsut want to present I on right Y axis so one can read either V or I from the same plot.

[Samir]

think of it as if you plot a variable say pressure (P) with tepmerature (t), plot (t,P) but you want two Y axis representing pressure in two different units say. mbar and torr. Am I able to explain myself?