[FieldTrip] errors replicating Salzburg Fieldtrip tutorial

[Schoffelen, J.M. (Jan Mathijs)]

Hi Irene,

Please check which version of the code you are using, and update to a more recent version to FieldTrip, and try again. The line + error you report does not match the ones in the current version of Fieldtrip.

Best wishes,
Jan-Mathijs



On 22 May 2019, at 09:21, Irene Varela Leniz <irene.varela at alumni.mondragon.edu<mailto:irene.varela at alumni.mondragon.edu>> wrote:

Dear Fieldtripers,

I am trying to replicate the well-known tutorial:salzburg [FielTrip] (http://old.fieldtriptoolbox.org/tutorial/salzburg). Anyway, I am getting some errors that I could not manage to solve. I would be really grateful if someone could lend me a hand.

I am working on section called "Localizing auditory evoked fields using beamforming techniques in parceled brain space". I managed to compute the sourcemodel as explained in the tutorial without any problem. But now, when "Computing the leadfield" I get an error message related with sourcemodel.inside field, which makes it impossible for me to create the leadfield. The structure is the following:

sourcemodel =
  struct with fields:
       pos: [6426×3 double]
       dim: [17 21 18]
      unit: 'm'
    inside: [17×21×18 logical]
       cfg: [1×1 struct]

The structure for computing the leadfield:

                        cfg                 = [];
                        cfg.label         = data.label;
                        cfg.elec          = data.elec;
                        cfg.vol         = hdm;
                        cfg.lcmv.reducerank = 2; % I am working with EEG data
                        cfg.grid = sourcemodel;
                        [grid] = ft_prepare_leadfield(cfg)

An the error I get:

Operands to the || and && operators must be convertible to logical scalar values.

Error in ft_checkconfig (line 529)
  elseif isfield(cfg, 'grid') && isfield(cfg.grid, 'inside') && any(cfg.grid.inside>1)

Error in ft_prepare_leadfield (line 156)
cfg = ft_checkconfig(cfg, 'inside2logical', 'yes');

I think the error comes from the fact that sourcemodel.inside is a 3-dimensional logical array. The operation - any(cfg.grid.inside>1)   does not output a logical scalar value because sourcemodel.inside is in 3 dimensions.
So far I have always worked with models whose inside parameter was of one dimension. Anyway, I'm not sure if this is the problem, please correct me if I'm wrong.

Has anyone encountered this same problem, and does anyone know how to fix it?

Thank you very much for your attention,


Irene


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