how can I calc velocity and acceleration in matlab?

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

Answer 1

[Iain]

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.

[Elli]

thanks.what about the high sample rate? would you suggest downsampling/ filtering it first?

[Iain]

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.