[Eeglablist] EEGLAB2022 study precomputed files directory and parameters

[Agatha Lenartowicz]

Thanks Arno! I can work with that. Agatha

On Wed, Apr 27, 2022, 7:20 PM Delorme, Arnaud via eeglablist <
eeglablist at sccn.ucsd.edu> wrote:

> Hi Agatha,
>
> > For a variety of reasons, I will have multiple studies for the same
> dataset. I do NOT wish to create a single study for this dataset, this is
> not an option for our work. To do so I am setting the ‘filepath’ variable
> in std_makedesign.m to my desired directory for a given study (it is
> correctly set in the STUDY.design.filepath. This variable however is being
> ignored during the precomputation and the precomputed files are being
> written in the data file directory (default).
> >
> > Question 1. How do I control where the files are being written for
> different studies?
>
> The simplest solution to your problem is to copy the STUDY into a separate
> folder if you want to have two studies pointing to the same files. Note
> that under Linux/Mac you can delete the EEGLAB set files in the copied
> folder and replace them with symbolic links to the other STUDY folder if
> you are concerned about space. This should still work as 2 separate studies.
>
> I know there used to be an option to specify a folder where the files
> would be precomputed (which we created at your request in EEGLAB 2014), but
> this is no longer the case.
> The reason we removed the option is that you were one of the only ones to
> use the option, and it was creating too many problems.
>
> > further issue is that even for the the same study, different designs, I
> am getting warnings that the files will be overwritten for the current
> STUDY.
>
> You only need to compute the files once. So yes, if you choose to
> recompute the files (which you do not need to), the files will be
> overwritten.
>
> > Question 2. How do I verify that the files that get written are
> respecting different parameters for different designs within a study -
> where is this recorded?
>
> All the files are MATLAB files, so you can load them from the command
> line. The parameters are in a field called “parameters.” For example
>
> >> tmp = load('-mat', 'S01.daterp');
> >> tmp.parameters
>
> ans =
>
>   1×12 cell array
>
>     {'channels'}    {1×71 cell}    {'interp'}    {1×71 struct}
> {'savetrials'}    {'on'}    {'recompute'}    {'on'}    {'fileout'}
> {'/data/data/STUD…'}    {'trialinfo'}    {1×784 struct}
>
> Best wishes,
>
> Arno
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