Re: [NBThelp] Help with DFA using NBT

[Alexander C. <ale...@ua...>]

Hi David,

You should try rather with real EEG data instead of random data. Are you
checking the plug-in of EEGLAB and the tool of ADJUST?

--

Edwin Alexander Cerquera S. M. Eng. Ph.D. (Dr. rer. nat.)
Associate Professor - IEEE Senior Member | ResearchGate profile
<https://www.researchgate.net/profile/Alexander_Cerquera> | IEEE-Collabratec
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Faculty of Electronic and Biomedical Engineering - Complex Systems Research
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2016-11-30 8:22 GMT-05:00 David Fernandez-Fidalgo <dfe...@me...>
:

> Hello:
>
> My name is David Fernandez-Fidalgo and I am a researcher at the National
> Intrepid Center of Excellence (NICoE) at Walter Reed Naval Hospital in
> Bethesda, MD. I have been trying to teach myself how to use NBT to perform
> DFA on MEG data and calculate the DFA exponent for various datasets. I have
> been using the information and examples on the wiki page (
> https://www.nbtwiki.net/doku.php?id=tutorial:detrended_
> fluctuation_analysis_dfa#computing_dfa_using_nbt) to learn how to remove
> artifacts from the signal and perform DFA. I keep running into an error
> every time I try to use the "nbt_filter_fir" function to filter a matrix of
> random numbers "Fs = 300; Signal = randn(20*60*Fs,1);" from the example
> provided in the wiki. The error I keep observing is:
>
> "??? Error using ==> mtimes
> Inner matrix dimensions must agree.
>
> Error in ==> firls at 80
> cos_ints = [omega; sin((1:N)' * omega)];
>
> Error in ==> fir1 at 98
> hh = firls(L-1,ff,aa);
>
> Error in ==> nbt_filter_fir at 108
> b = fir1(floor(fir_order*fs),[hp lp]/(fs/2));
>
> Error in ==> test at 14
> [Data_filtered] = nbt_filter_fir(Signal, highpass, lowpass, Fs, 2/8);"
>
> Do you have any suggestions for how I can resolve this error and filter
> the dataset?
>
> Thank You,
> David FF
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