Integration of displacement to velocity then acceleration

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Adrienne
Adrienne 2014-5-15
评论： Sean de Wolski 2014-5-16
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

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Sean de Wolski
Sean de Wolski 2014-5-15
Don't you mean take the derivative of displacement with respect to time to get velocity and again for acceleration?
doc diff
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Adrienne
Adrienne 2014-5-15
编辑：Adrienne 2014-5-15
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 2014-5-16
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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