Integration of displacement to velocity then acceleration

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Adrienne 2014-5-15

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评论： Sean de Wolski 2014-5-16

采纳的回答： Sean de Wolski

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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

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Sean de Wolski 2014-5-15

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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 2014-5-15

编辑：Adrienne 2014-5-15

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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 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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