Plotting a mean line on a graph

Hi everyone

I currently have a graph that looks like this

figure plot(t,r(ix,:),'r'); hold on plot(t,r(~ix,:),'b'); xlabel('Time (ms)') ylabel('R (Y Axis)')

It is essentially a sine graph that tapers off.

What I want to do is add a line where matlab will plot the mean,

One for the value x, one for the value ~x, and one overall.

Please can someone help?

Answer 1

[jgg]

 %set up
 x = 1:0.1:10;
 r = sin(x);
 t = 1:91;
 x = mod(t,2) == 0; 
 m_x = mean(r(x));
 m_x2 = mean(-r(~x));

 % plotting
 figure
 plot(t(x),r(x),'b')
 hold on
 plot(t(~x),-r(~x),'r')
 plot(t,ones(length(t),1)*m_x)
 plot(t,ones(length(t),1)*m_x2)

You can do it like this; the only operative part you need to do is:

 m_x = mean(r(x));
 plot(t,ones(length(t),1)*m_x)

Which in your code would like slightly different since you appear to have r as a matrix instead of a vector.