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how can I calc velocity and acceleration in matlab?

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Elli
Elli 2013-8-22
By the way, I have waveformdata with smplrate=5000 over timeperiod of 30sec.
Would you suggest any downsampling or filtering first? cause if I calc the diff(..), there is almost no difference in the data.Thank you

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Iain
Iain 2013-8-22
编辑：Iain 2013-8-22
Velocity = (Position2 - Position1) * sample_rate (or divide by the difference in times)
Acceleration = (Velocity2-Velocity1) * sample_rate (or divide by the difference in times)
PS. It is a calculation which is prone to noise.
  2 个评论
Elli
Elli 2013-8-22
thanks.what about the high sample rate? would you suggest downsampling/ filtering it first?
Iain
Iain 2013-8-22
It depends on your data.
Yes, you might get accuracy improvements by averaging out over a few samples to reduce temporal noise. You might get more improvement by median-filtering, if the noise is prone to have massive spikes.
What you need to do depends on the data.

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