<div dir="ltr"><div>Hi
Merethe,</div><div><br></div><div>Welcome to Fieldtrip!<br></div><div><br></div><div>ft_read_event is what we call a 'low-level' function in fieldtrip, and is typically not called in an analysis script (as a beginner at least). Instead, we advise using 'higher-level' functions that call those (e.g. ft_preprocessing) and use a more curated cfg structure for configuration options etc.<br></div><div><br></div><div>Have you already run through <a href="https://www.fieldtriptoolbox.org/tutorial/">one or two of the tutorials</a>? That would be a good way to get introduced to a standard workflow.</div><div><br></div><div>If you are already beyond this, and need more specific help with ft_read_event, e.g. if you are creating your own trialfun, then we would need a bit more info to help out. If it indeed concerns your own trialfun, then posting the rest of the code (which should not be too large to begin with) would be a good start.</div><div><br></div><div>Good luck!</div><div>Stephen<br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Op di 16 mrt. 2021 om 17:35 schreef Merethe Blandhol <<a href="mailto:merethe.blandhol@new.ox.ac.uk">merethe.blandhol@new.ox.ac.uk</a>>:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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Hi everyone, </div>
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I'm a master's student, new to the Fieldtrip community - I'm currently working on analyzing data for my research project involving an MEG sustained attention button-press task. </div>
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<span style="color:rgb(0,0,0);font-family:Calibri,Arial,Helvetica,sans-serif;font-size:12pt">When trying to run a script that gets stimulus onset and button press timings for each participant, I encounter an error at the first line with the fieldtrip
function </span><b style="font-size:12pt;font-style:inherit;font-variant-ligatures:inherit;font-variant-caps:inherit">ft_read_event</b><span style="color:rgb(0,0,0);font-family:Calibri,Arial,Helvetica,sans-serif;font-size:12pt">. Could this
be an error in my fieldtrip path or installation? </span></div>
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<span style="color:rgb(0,0,0);font-family:Calibri,Arial,Helvetica,sans-serif;font-size:12pt">I have already tried basic troubleshooting for the fieldtrip path, but this doesn't seem to solve it. The script is running fine for others, so it seems
to be an issue with my computer/FieldTrip specifically. </span></div>
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The line of code is:</div>
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evt = ft_read_event(fullfile(myDir, fileID));</div>
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I get the following error message:</div>
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<span style="font-size:11pt">Reading 6000 ... 174999 = 12.000 ... 349.998 secs...</span><span style="font-size:11pt;color:rgb(200,38,19)">Error using reshape
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<div><span style="font-size:11pt;color:rgb(200,38,19)">Number of elements must not change. Use [] as one of the size inputs to automatically calculate the appropriate size for that</span></div>
<div><span style="font-size:11pt;color:rgb(200,38,19)">dimension.</span></div>
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<div><span style="font-size:11pt;color:rgb(200,38,19)">Error in fiff_read_raw_segment (line 161)</span></div>
<div><span style="font-size:11pt;color:rgb(200,38,19)"> one = double(reshape(tag.data,nchan,this.nsamp));</span></div>
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<div><span style="font-size:11pt;color:rgb(200,38,19)">Error in ft_read_data (line 1251)</span></div>
<div><span style="font-size:11pt;color:rgb(200,38,19)"> dat = fiff_read_raw_segment(hdr.orig.raw,begsample+hdr.orig.raw.first_samp-1,endsample+hdr.orig.raw.first_samp-1,chanindx);</span></div>
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<div><span style="font-size:11pt;color:rgb(200,38,19)">Error in read_trigger (line 82)</span></div>
<div><span style="font-size:11pt;color:rgb(200,38,19)"> dat = ft_read_data(filename, 'header', hdr, 'dataformat', dataformat, 'begsample', begsample, 'endsample', endsample, 'chanindx',</span></div>
<div><span style="font-size:11pt;color:rgb(200,38,19)"> chanindx, 'checkboundary', 0);</span></div>
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<div><span style="font-size:11pt;color:rgb(200,38,19)">Error in ft_read_event (line 1637)</span></div>
<div><span style="font-size:11pt;color:rgb(200,38,19)"> trigger = read_trigger(filename, 'header', hdr, 'dataformat', dataformat, 'begsample', flt_minsample, 'endsample',</span></div>
<div><span style="font-size:11pt;color:rgb(200,38,19)"> flt_maxsample, 'chanindx', binaryindx, 'detectflank', detectflank, 'denoise', denoise, 'trigshift', trigshift, 'trigpadding',</span></div>
<span style="font-size:11pt;color:rgb(200,38,19)"> trigpadding, 'fixneuromag', false);</span><br>
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<span style="font-size:11pt;color:rgb(200,38,19)">Error in getButtonPresses (line 21)</span></div>
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<span style="font-size:11pt;color:rgb(200,38,19)">evt = ft_read_event(fullfile(myDir,fileID));</span></div>
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<span style="font-size:12pt">I thought this might be an error with my fieldtrip path, and I have tried restoring the default path like this:</span></div>
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>> restoredefaultpath</div>
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>> addpath('C: (location of fieldtrip)')</div>
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>> ft_defaults</div>
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However, the problem is not resolved after this. </div>
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I also looked at each function using <b>>> which ft_read_event </b>etc.</div>
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<span style="color:rgb(0,0,0);font-family:Calibri,Arial,Helvetica,sans-serif;font-size:12pt">It returns a similar location for each function (C:/Admin/AppData/Roaming/MathWorks/MATLAB Add-Ons/Collections/FieldTrip/fileio/ft_read_event.m) but </span><b style="font-size:12pt;font-style:inherit;font-variant-ligatures:inherit;font-variant-caps:inherit">read_trigger</b><span style="color:rgb(0,0,0);font-family:Calibri,Arial,Helvetica,sans-serif;font-size:12pt">
is not found. </span><br>
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My MATLAB is located on the computer under "Program Files" in case this is relevant. </div>
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Matlab version: 9.8.0.1380330 (R2020a) Update 2</div>
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OS build: 19042.804/Windows 10</div>
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Any help or advice is greatly appreciated!</div>
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Kind Regards,</div>
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Merethe Blandhol</div>
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</blockquote></div>