Re: [NBThelp] Help with DFA using NBT

[Simon-Shlomo P. <poi...@nb...>]

Dear David,

I assume you are running this
Fs = 300;
Signal = randn(20*60*Fs,1);
highpass = 8;        % Highpass corner frequency.
lowpass = 13;        % Lowpass corner frequency.
[Data_filtered] = nbt_filter_fir(Signal, highpass, lowpass, Fs, 2/8);

That should work without problems.

Best wishes,
Simon

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2016-11-30 22:22 GMT+01:00 Michael Melnychuk <mel...@gm...>:

> 'Firls' not girls....sry autocorrect
>
> On Wednesday, November 30, 2016, Michael Melnychuk <mel...@gm...>
> wrote:
>
> > Hard to say without seeing the data but I would try removing the
> transpose
> > operator in girls at line 80 or something along those lines and go from
> > there.
> >
> > On Wednesday, November 30, 2016, David Fernandez-Fidalgo <
> > dfe...@me...
> > <javascript:_e(%7B%7D,'cvml','dfe...@me...');>> wrote:
> >
> >> 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_fluc
> >> tuation_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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