[FieldTrip] EEG soure reconstruction using SAM beamformer

[Tyler Grummett]

Hey Praghajieeth,

Firstly, I am by no means an expert of fieldtrip (I only started using it six or so months ago), so if I am wrong I apologise but you have been warned haha.

Ill try and help, can you look up the following:
Can you tell me what the dimensions of Cy is and whether there are any NaNs.
What dimensions are data.chan.elec and data.label?
Also its worth checking your vol1.mat for NaNs aswell.

Good luck!

Tyler

Sent from my iPad

On 27 Aug 2014, at 8:33 pm, "Praghajieeth Raajhen" <praajhen at gmail.com<mailto:praajhen at gmail.com>> wrote:

Hello!!!!

Please Help out.  where am I going wrong?

 cfg              = [];
 cfg.channel   = 'EEG';
 cfg.method   = 'sam';
 cfg.grid        = grid;
 cfg.vol         = vol1;
 cfg.projectnoise = 'yes';
 cfg.keepfilter = 'yes';
 source = ft_sourceanalysis( cfg, timelock);

workspace of grid,vol1,timelock (.mat)
https://www.dropbox.com/s/bu1inxwgeyc01mi/timelock%2Cgrid%2Cvol.mat?dl=0

1. Using fieldtrip 2013 version
When i do  EEG sourceanalysis using "SAM" method, following error occurs

Attempted to access noise(0); index must be a positive integer or logical.

Error in ==> beamformer_sam at 111
  noise = noise(end);

Error in ==> ft_sourceanalysis at 841
      dip(i) = beamformer_sam(grid, sens, vol, squeeze_avg,squeeze(Cy(i,:,:)), optarg{:});


PS: same code for MEG source reconsturction works quite good.

2. Using fieldtrip 2014 version
when i do the same I'm getting this kind of errors

Undefined function or variable 'abort'.

Error in ==> ft_sourceanalysis at 156
if abort

PS: Moreover, I cant even do preprocessing with 2014 fieldtrip version. It is showing same above error.


advance thanks for your kind help.

Praghajith R.S.
praajhen at gmail.com<mailto:praajhen at gmail.com>
Master Thesis @ UKSH
Kiel, Germany


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