How to plot the difference of two different time scaled values in the same plot(Single Plot)

Pl. help me out I want to plot plot(t,(x-y),'b') where x and y have different t scale. for x, t=35 (say) and for y, t=55 data points. I have plotted t,x and t,y in a single plot by using hold on and hold off commands, but plot(t,(x-y),'b') is not working with hold on and hold off. Kindly help me

[Azzi Abdelmalek]

what do you want to do with a missing x data? complete with zeros? if x and y are not the same length, what x-y means?

Answer 1

[Azzi Abdelmalek]

what you can dot is interpolate before calculting x-y

example

close
t1=linspace(0,10,35)
x=sin(t1)
t2=linspace(1,10,55)
y=cos(t2)
%for the missing x data
xi=interp1(t1,x,t2)
plot(t1,x)
hold on,plot(t2,y,'g')
hold on,plot(t2,xi-y,'r')