Residual analysis & Low Pass Butterworth filter

Hi, I am a PhD student in swimming biomechanics.

For my first PhD study I will be using force-time curve data and I am interested in how to smooth it. I would like to know how to apply a Butterworth low pass filter and define the cut-off frequency by residual analysis by in MATLAB. The sampling frequency is 333Hz. Find attached the a file with the force data.

I would appreciate whether you could tell me how to define the cut-off frequency by residual analysis and how to apply a Butterworth low pass filter with the selected cut-off frequency.

Thanks in advance

[Ashley Bagley]

Hi Cristian,

Did you discover how to answer your question as I will need to do the same for my 2nd PhD study and wondered if you could help?

Kind Regards,

Ashley

Answer 1

[André Ivaniski Mello]

Hi,

maybe this link will help

http://g-biomech.blogspot.com/2013/12/analise-residual.html