make getAnatFilename error message more informative

[Remi-Gau]

Describe your problem in detail

My anat file is in the "session-003" but I forgot to change the default "opt.anatReference.session" to "3".

If there is only one anat T1w file but not in the default session folder (first session) or the one asked the error message is very unhelpful.

Describe what outcome you expected

The error message to tell me where the T1w files are.

Error message

Index exceeds matrix dimensions.

Error in getAnatFilename (line 42)
  anat = anat{1};

Error in setBatchSelectAnat (line 31)
  [anatImage, anatDataDir] = getAnatFilename(BIDS, subID, opt);

Error in bidsSpatialPrepro (line 62)
      matlabbatch = setBatchSelectAnat(matlabbatch, BIDS, opt, subID);

Error in preprocessRetinotopy (line 20)
bidsSpatialPrepro(opt)

[Remi-Gau]

Alternatively, we could let the pipeline figure out where the anat file is when the user does not say anything.

[marcobarilari]

Yes! related to this, you have an error also if you set that your anat is in ses-002 and you have only the ses-002 folder in your dataset.

I guess that the session nb you set is used as an index to locate the folder among the others. It should instead use it as the folder name.

Moreover, if used as the folder name to locate it, we could use a label that corresponds to the dataset type (e.g. localizer) instead of the nb of session in time

[Remi-Gau]

yeah that's another issue.

Actually there is literally a TODO from past me in that function:

% TODO allow for the session to be referenced by a string e.g ses-retest

Seems my past self is not a complete idiot / dick.

[Remi-Gau]

@marcobarilari

I am closing this. As it was fixed by the PR on my side.

If you still have problems on your side: feel free to reopen it.

[Remi-Gau]

@all-contributors please add @Remi-Gau for bug

[allcontributors]

@Remi-Gau

I've put up a pull request to add @Remi-Gau! 🎉