Confusion using cumtrapz for acceleration

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Bran
Bran il 16 Set 2014
Commentato: A Jenkins il 17 Set 2014
I have data for a person swinging their leg back and forth, I have this data in the form of acceleration. I have tried using cumtrapz to turn this data into displacement.
ie Vel = vel0 + cumtrapz(t,Acc)
Pos = pos0 + cumtrapz(t,Vel)
however I get a graph that is increasing only, no osccilations, I am confused, is cumtrapz dealing with the negative accelerations accurately?
any ideas about how to tackle this problem?
  1 Commento
A Jenkins
A Jenkins il 17 Set 2014
If you would provide some sample data it would help people reproduce your problem.
I made up my own data but your code seems to work just fine:
t=0:0.1:10;
Acc=sin(t);
vel0=-1;
pos0=0;
Vel = vel0 + cumtrapz(t,Acc)
Pos = pos0 + cumtrapz(t,Vel)
plot(t,Acc,t,Vel,t,Pos)
legend('Acc','Vel','Pos')

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