[Eeglablist] Problem with newtimeftrialbaseln.m

[Makoto Miyakoshi]

Dear Laura,

It is impressive that you successfully debugged EEGLAB. Thank you also for
kindly letting us know.
You underpinned a good problem. Could you please report it to the
developers so that in the next release of EEGLAB it will be fixed?
https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_sccn_eeglab_issues&d=DwIFaQ&c=-35OiAkTchMrZOngvJPOeA&r=kB5f6DjXkuOQpM1bq5OFA9kKiQyNm1p6x6e36h3EglE&m=itNiLbVQWPHLR--ZBQJOmbE-FVeXVA4BroY17yu4uFqZkRFprmV7m556waItCfVk&s=P0bZhi0oDTlOMGbZTLKcv-iyjb9QhU5V5EjC5LO0BC8&e= 
I thought of copy and paste it on behalf of you but I realized you won't
receive any updates if I post it from my account.
I appreciate your patience and cooperation.
Thank you Laura!

Makoto

On Fri, Jan 7, 2022 at 10:12 AM Klatt, Laura via eeglablist <
eeglablist at sccn.ucsd.edu> wrote:

> Hi all,
>
> I encounter a problem with the newtimeftrialbaseln() function when I want
> to load erspdata using std_erspplot().
>
> Specifically, I created a STUDY design and precomputed ERSPs. In order to
> load the data to plot topographies, I then run the following lines of code
> (using EEGLAB v2021.1 and MATLAB R2021b):
>
> EEG=ALLEEG(1);
> electrodes = {EEG.chanlocs.labels};
> [STUDY, erspdata, ersptimes, erspfreqs] =
> std_erspplot(STUDY,ALLEEG,'channels',electrodes, 'noplot', 'on');
>
> And I get this error message:
>
> Index in position 3 exceeds array bounds. Index must not exceed 60.
>
> Error in newtimeftrialbaseln (line 99)
>             mbase = mean(P(:,:,tmpbase,:),3);
>
> Error in std_readdata>processtf (line 412)
>         dataout = newtimeftrialbaseln(P, xvals, g);
>
> Error in
> std_readdata>@(x)processtf(x,xvals,opt.datatype,opt.singletrials,params)
> (line 246)
>             dataTmp{iSubj} = cellfun(@(x)processtf(x, xvals, opt.datatype,
> opt.singletrials, params), dataTmp{iSubj}, 'uniformoutput', false);
>
> Error in std_readdata (line 246)
>             dataTmp{iSubj} = cellfun(@(x)processtf(x, xvals, opt.datatype,
> opt.singletrials, params), dataTmp{iSubj}, 'uniformoutput', false);
>
> Error in std_erspplot (line 250)
>     [STUDY, allersp, alltimes, allfreqs, events, paramsersp] =
> std_readdata(STUDY, ALLEEG, 'channels', opt.channels, 'timerange',
> params.timerange, ...
>
> I tracked the error down to newtimeftrialbaseln. According to the
> documentation of newtimeftrialbaseln the tf input data should have the
> following the dimensions:
> [freqs x times x trials] or [channels x freqs x times x trials].
>
> However, it seems like the variable that causes the code to crash
> (variable P, see line 99) has the wrong order of dimensions. In my case it
> is [freq x times x trials x channels].
> I cannot figure out why that is. The code runs fine if I am only trying to
> load data from one channel (i.e., when the input data is 3-dimensional:
> freqs x times x trials).
>
> Of course I could simply reshape the variable P, but I’d rather not mess
> around in the build-in EEGLAB functions without understanding why that
> error occurs.
>
> My current workaround is to only load one channel at a time, looping
> through my ‘electrodes’ variable until I have the data from all electrodes.
> But of course that is somewhat inefficient.
>
> I appreciate any comments or hints.
>
> Thanks a lot!
> Best,
> Laura
>
>
>
>
> --
> Dr. Laura-Isabelle Klatt
> Leibniz Research Centre for Working Environment and Human Factors
> Department of Ergonomics
> Research Unit: Information processing
> Ardeystr. 67
> 44139 Dortmund
>
> Contact:
> klatt at ifado.de
> +49 / 231 1084 260
> twitter: @LoraKlatt
>
> Personal website:
> https://urldefense.proofpoint.com/v2/url?u=https-3A__lauraklatt.github.io_&d=DwIGaQ&c=-35OiAkTchMrZOngvJPOeA&r=kB5f6DjXkuOQpM1bq5OFA9kKiQyNm1p6x6e36h3EglE&m=GUFNy43aiGBdmL9h_EH-a80yMQL2HHeeV4Urh90aLbh0ZGAYi4GEAAGNIYaSsoeC&s=9acLLWra8mFUmhTluc4OlBgBCYwKWYfIiLMqSzoVW6M&e=
>
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