Integration of displacement to velocity then acceleration

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I want to integrate this displacement vector (jh) to get velocity and then to get acceleration.
There are multiple trials of which I need to integrate from. when i do:
%%Calculation of Velocity and Acceleration
v= trapz (jh);
a= trapz (v);
this gives an output for the V but not for the A. When I do cumtrapz below:
%%Calculation of Velocity and Acceleration
v= cumtrapz (jh);
a= cumtrapz (v);
This is a cumulative integration and this is not what I want

Accepted Answer

Sean de Wolski
Sean de Wolski on 15 May 2014
Don't you mean take the derivative of displacement with respect to time to get velocity and again for acceleration?
doc diff
  4 Comments
Adrienne
Adrienne on 15 May 2014
Edited: Adrienne on 15 May 2014
i still don't know what i've done wrong:
dt=tof*[1:1:jh];
x= (data(:,5));
y= (data(:,5));
vx= diff(jh)./dt;
Sean de Wolski
Sean de Wolski on 16 May 2014
I would guess you would want dt to be a column vector so it's the same shape and size as x and y and you will want to have it be the change in time, not absolute time.

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