[FieldTrip] Localizing sources using beamformer techniques web tutorial

[K Jeffrey Eriksen]

Jan-Mathijs,

Your path suggestion got me going, thanks. I then encountered some other errors as I went further along in the tutorial. The one that stopped me was the last listed below, #5. I do not know if I have the folders and files set up right, so have included a screenshot of how they appear on my computer. In particular it seems that SubjectSEF.ds appears to be a folder at some times, and a file at others.

-Jeff

1.	cfg = ft_definetrial(cfg);	->

Warning: no trialfun was specified, using ft_trialfun_general 
> In ft_definetrial (line 138)
  In fieldtrip_test_lcmv (line 13) 
evaluating trialfunction 'ft_trialfun_general'
reading the events from 'E:\Staff\Jeff\Jeff_Matlab\FieldTrip_KJE\data\SubjectSEF\SubjectSEF.ds\SubjectSEF.res4'
found 7826 events
created 204 trials
the call to "ft_definetrial" took 8 seconds

2.	cfg.neighbours      = ft_prepare_neighbours(cfg, timelock);	-> clicking on sensor did NOT show its label

3.	timelock_planar     = ft_megplanar(cfg, timelock);	-> 

the input is timelock data with 274 channels and 360 timebins
Warning: the trial definition in the configuration is inconsistent with the
actual data 
> In ft_warning (line 184)
  In fixsampleinfo (line 68)
  In ft_datatype_raw (line 175)
  In ft_checkdata (line 362)
  In ft_megplanar (line 98)
  In fieldtrip_test_lcmv (line 49) 
Warning: reconstructing sampleinfo by assuming that the trials are
consecutive segments of a continuous recording 
> In ft_warning (line 184)
  In fixsampleinfo (line 79)
  In ft_datatype_raw (line 175)
  In ft_checkdata (line 362)
  In ft_megplanar (line 98)
  In fieldtrip_test_lcmv (line 49) 
the call to "ft_selectdata" took 0 seconds
average number of neighbours is 7.35
minimum distance between neighbours is   2.00 cm
maximum distance between gradiometers is   4.41 cm
Warning: copying input chanunit to montage 
> In ft_apply_montage (line 120)
  In ft_megplanar (line 325)
  In fieldtrip_test_lcmv (line 49) 
the call to "ft_megplanar" took 2 seconds

4.	vol                = ft_prepare_headmodel(cfg, seg);	-> 

Warning: please specify cfg.method='projectmesh', 'iso2mesh' or
'isosurface' 
> In ft_prepare_mesh (line 138)
  In ft_prepare_headmodel (line 348)
  In fieldtrip_test_lcmv (line 80) 
Warning: using 'projectmesh' as default 
> In ft_prepare_mesh (line 139)
  In ft_prepare_headmodel (line 348)
  In fieldtrip_test_lcmv (line 80) 
triangulating the outer boundary of compartment 1 (brain) with 3000 vertices
the call to "ft_prepare_mesh" took 4 seconds
the call to "ft_prepare_headmodel" took 4 seconds

5.	hdr                 = ft_read_header('SubjectSEF.ds');	-> 

Warning: could not determine filetype of SubjectSEF.ds 
> In ft_filetype (line 1294)
  In ft_read_header (line 159)
  In fieldtrip_test_lcmv (line 84) 
Error using ft_read_header (line 2248)
unsupported header format "unknown"

Error in fieldtrip_test_lcmv (line 84)
hdr                 = ft_read_header('SubjectSEF.ds');


Message: 2
Date: Fri, 26 Aug 2016 05:36:49 +0000
From: "Schoffelen, J.M. (Jan Mathijs)" <jan.schoffelen at donders.ru.nl>
To: FieldTrip discussion list <fieldtrip at science.ru.nl>
Subject: Re: [FieldTrip] errors while trying to run beamformer
	tutorial
Message-ID: <931E197F-6020-4237-90ED-67E105B06151 at donders.ru.nl>
Content-Type: text/plain; charset="utf-8"

Hi Jeff,
I assume that you have unzipped the data, and have the data (i.e. the ?SubjectSEF.ds?) in directoryX.
You need to specify the full path to the data in cfg.dataset (or your current working directory should be directoryX), i.e. cfg.dataset = ?directoryX/SubjectSEF.ds?; Hope this helps, Jan-Mathijs


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