Integration of velocity not working, creating zeros

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Adrienne
Adrienne 2014-5-15
编辑： dpb 2014-5-16
%%Calculation of Velocity and Acceleration
v(i,1)= trapz(jh(i,1));
a(i,1)= trapz(v(i,1));
This is what I am using for differentiation. But both of these are coming out in the workspaces as zero... I don't know what this is. jh is jump height, there are numbers for this

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dpb
dpb 2014-5-15
trapz is an trapezoidal INTEGRATION routine, not differentiation
doc trapz
doc diff
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dpb
dpb 2014-5-15
编辑：dpb 2014-5-16
"not working" is NEVER sufficient explanation for a problem.
But, if v is velocity and a acceleration, then you're going the wrong way physically.
a=dv/dt --> v=Int(a dt)
As for the zero result, looks like jh(i,1) is a single point so there's nothing to integrate over (even though you need to be differentiating instead it would appear).

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