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

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Vicky vicky
Vicky vicky 2012-10-11
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

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回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2012-10-11
编辑：Azzi Abdelmalek 2012-10-11
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')

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