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If your purpose is just to detrend, I would use ft_preprocessing:
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<div class="">cfg = [];</div>
<div class="">cfg.detrend = ‘yes’;</div>
<div class="">data = ft_preprocessing(cfg, data);</div>
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<div class="">ft_resampledata is for resampling (what’s in a name), and allows for optional detrending prior to the downsampling (because a large trend may lead to edge artifacts upon the downsampling).</div>
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<div class="">best,</div>
<div class="">Jan-Mathijs</div>
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<div class="">PS: I would also recommend to review your path settings, since you get some warnings about octave functions</div>
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<div class="">On 12 May 2016, at 11:02, shiri makov <<a href="mailto:mkshiri@gmail.com" class="">mkshiri@gmail.com</a>> wrote:</div>
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Dear community,</p>
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My name is Shiri and I am a student at Tel-Aviv Univesrity. I study perception during sleep using EEG. Currently I am analysing EEG data collected with EGI system.</p>
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I tried using ft_resampledata to detrend the data. The weird thing is that <b class="">
sometimes </b>when I call ft_resampledata, I get an error message:</p>
<p style="padding:0px;margin:0px 0px 1em" dir="ltr" class=""><span style="font-family:georgia,serif" class="">the input is raw data with 8 channels and 60 trials</span><br class="">
<span style="font-family:georgia,serif" class="">resampling data</span><br class="">
<span style="font-family:georgia,serif" class="">Octave functions should not run on Matlab</span><br class="">
<span style="font-family:georgia,serif" class="">Removing path ... </span><br class="">
<font color="#ff0000" class=""><span style="font-family:georgia,serif" class="">Error using .* </span><br class="">
<span style="font-family:georgia,serif" class="">Matrix dimensions must agree.</span><br class="">
<span style="font-family:georgia,serif" class="">Error in resample (line 71)</span><br class="">
<span style="font-family:georgia,serif" class=""> h = p*firls( L-1, [0 2*fc 2*fc 1], [1 1 0 0]).*kaiser(L,bta)' ;</span><br class="">
<span style="font-family:georgia,serif" class="">Error in ft_resampledata (line 208)</span><br class="">
<span style="font-family:georgia,serif" class=""> data.trial{itr} =</span><br class="">
<span style="font-family:georgia,serif" class=""> transpose(resample(transpose(data.trial{itr}),fsres,fsorig)); </span><br class="">
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As noted, this error appears only sometimes. If I run ft_resampledata again immidiately after receiving the error, it works well (same cfg, same data).<br class="">
The error always happens when I call the function within a parfor loop. It almost never happens when I run the function line individually, without preceeding script lines.</p>
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The cfg<span style="font-family: Calibri, Geneva, Arial, Verdana, sans-serif; font-size: 15px; line-height: 22.5px;" class=""> I use is very basic:</span><br class="">
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It happened to me on many data structs, so I share a link with just one of them (<a href="http://www.filedropper.com/dataexample" target="_blank" class="">http://www.filedropper.com/dataexample</a>). Here too, I got the error and right after that I ran the
function line again and worked well.</p>
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I don't think it's ok to live in peace with this function erroring from time to time, can someone tell me what this error means? Did I not use the function correctly? </p>
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Best,<br class="">
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Shiri</p>
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