resample and filtering kinematic data

[Farzaneh Yazdani]

Dear all,
I have a series of unprocessed kinematic data in ASCII file format, which I need to firstly convert them from different trials into equal length array (100 data point) and then filter them with butterworth cut-off 6.

As i'm not interested to use MATLAB, Is there any free software to be able to perform both functions?

Many thanks in advance, best wishes,

Farzaneh

[Chris Kirtley]

Re: resample and filtering kinematic data

Li Li, supplied an Excel spreadsheet (Resample.xls)from a program by D. Gordon Robertson,):

http://clinicalgaitanalysis.com/tools/

[Wadim Korneew]

Re: resample and filtering kinematic data

Free Resampling Software Note: libresample and sndfile-resample (from libsamplerate) are already included in the Planet CCRMA Distribution. If you are running Red Hat Linux, check out the Planet. There is also SoX (which uses libsoxr, the SoX resampler library) to change sampling rates by this method. Say port search sox (Mac), yum search sox (Linux), etc., to find it. See also ssrc (from Shibatch) which is a fixed-point sampling-rate conversion library installable packages for Debian and Ubuntu. There is a project combining ssrc and sox on SourceForge: https://sourceforge.net/projects/resamplerv/ Check out http://src.infinitewave.ca/ for a large list of implementations and their relative performance. Seriously check it out--the coverage is amazing. New in 2016 is a python (Cython) implementation released under a BSD-style (ISC) license called resampy: https://github.com/bmcfee/resampy

[Edmund Cramp]

Re: resample and filtering kinematic data

Filter software tends to require specific file/data formats so I suspect that the easiest method would be to read the data into a spreadsheet, filter the data, and then re-sample the filtered data.

[Christian Maiwald]

Re: resample and filtering kinematic data

Dear all,
I have a series of unprocessed kinematic data in ASCII file format, which I need to firstly convert them from different trials into equal length array (100 data point) and then filter them with butterworth cut-off 6.

As i'm not interested to use MATLAB, Is there any free software to be able to perform both functions?

Many thanks in advance, best wishes,

Farzaneh

Hi Farzaneh,

as far as I can see, the previous suggestions did not include GNU R, one of the most powerful and competitive programming environments and viable alternatives to MATLAB. It's free, has some nice graphical frontends (e. g. RStudio), runs on all major operating systems and is permanently developed by a huge international community. Check out https://www.r-project.org/ for details.
There is a learning curve, but for users who are familiar with some sort of higher language programming it should't pose any problem to quickly accomplish the data analysis you're aiming for.

Cheers
Chris