[FieldTrip] Error using ft_read_header

[Stephen Whitmarsh]

Dear Alina,

Not sure there is not something more sinister at play in the code somewhere
(I mean a bug or installation error), but I would start by asking why you
are using  *ft_read_header *to load a .mat file?

Are you sure you don't just want to load the matfile with MATLAB's load
functions? I.e. header = load('myfilename.mat')? Or, otherwise, read the
header of an original EEG/MEG datafile (some EEG/MEG dataformat)?

If not, and for a more informed response, please specify a bit more of the
code you use to process/write and then (try to) load the header.

Cheers,
Stephen



Op di 23 jun. 2020 om 13:30 schreef Bondarenko, Alina I <
alina.bondarenko19 at imperial.ac.uk>:

> Hello all,
>
>
> I'll try to describe the problem I've been having as clearly as I can here:
>
>    - I'm trying to use a Field Trip function *ft_read_header *to load
>    some .mat files.
>
>    - When I try to load up a file using *ft_read_header,* I get an error
>    message saying that within the *ft_read_header *script, the function
>    *feval* is being used incorrectly. Namely, that *feval* is trying to
>    execute a script called *matlab* as if it were a function.
>
>    Error using feval
>    Attempt to execute SCRIPT matlab as a function:
>    /Applications/MATLAB_R2019b.app/toolbox/matlab/general/matlab.m
>
>    - When I look inside the *ft_read_header* script, the line (2594) that
>    gives the error looks like this:
>
>    feval(headerformat, filename)
>
>    Where *headerformat* is assigned a string 'matlab', which is supposed
>    to represent the file type of the file I'm trying to load. Filename is a
>    string variable I assign, e.g. filename = 'session1.mat'.
>
>    Headerformat is assigned the string 'matlab' in line 203 of
>    *ft_read_header *(found in debugging mode):
>
>    headerformat = ft_filetype(filename);
>
>
>    - Feval is supposed to "evaluate a function" (I'm not quite sure
>    exactly what this means based on the documentation), but it's first
>    argument is supposed to be a function name, so I guess that a string saying
>    'matlab' should have always thrown an error, but the thing is that this
>    function used to work just fine for me before. I also haven't edited any of
>    the built in Field Trip scripts, so I'm not sure why this has stopped
>    working.
>
>
>
> Here are some things I've tried to fix the problem:
>
>
>    - I looked up the 'executing script as function error' and thought
>    that since Matlab would like to execute a function, but is instead
>    executing a script of the same name, then changing the name of the script
>    could stop the problem.
>
>    However, when I change the name of the matlab.m script (e.g. to
>    matlab_change.m) I get this error message instead:
>
>    Error using feval
>    Previously accessible file
>    "/Applications/MATLAB_R2019b.app/toolbox/matlab/general/matlab.m" is
>    now inaccessible.
>
>    The only file called matlab.m is a short text file containing some
>    info about what Matlab is and what it can be used for (I used "*which
>    matlab -all"* to check this). There are no functions called matlab.
>
>    - In between the time when this function was working fine for me, and
>    when it started showing me this error, I installed several versions of OSL
>    and SPM on my computer. So, I uninstalled all these things.
>    - Uninstalled and reinstalled Field Trip
>    - Uninstalled and reinstalled Matlab
>    - Copy pasted all the functions involved and saved these under
>    different names in different folders. Tried running them - got the same
>    error.
>
>
> I would greatly appreciate anyone's help on this! This error has been
> driving me crazy.
>
> All the best,
> Alina.
>
>
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> https://doi.org/10.1371/journal.pcbi.1002202
>
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