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<div><font size="3">>Dear Elena</font></div>
<font size="3">>I used it recently with MEG data and local spheres model </font>
<div><font size="3">>I don't think it could work with eeg but I don't know.</font></div>
<font size="3">>Yuval<br>
<br>
Hi again,<br>
Theoretically SAM should work for EEG as well. Is there any particular reason it does not?<br>
<br>
I have found a previous message by </font><font color="black" face="Helvetica" size="3"><span style="font-weight:normal;font-variant:normal;text-transform:none;"><font size="3">Don Rojas and introduced the lambda correction he suggested.
<br>
Now there is another error (see below).<br>
<br>
Dear developers, what is wrong? I would be very grateful for help!<br>
<br>
Elena</font><br>
<br>
<br>
***********************<br>
sourcepst = ft_sourceanalysis(cfg, tlckavgpst);<br>
the input is timelock data with 30 channels and 1250 timebins<br>
using headmodel specified in the configuration<br>
using electrodes specified in the configuration<br>
creating dipole grid based on user specified dipole positions<br>
15156 dipoles inside, 11814 dipoles outside brain<br>
the call to "ft_prepare_sourcemodel" took 0 seconds and an estimated 1 MB<br>
scanning repetition 1<br>
using precomputed leadfields<br>
scanning grid<br>
Undefined function 'SAM_costfun' for input arguments of type 'double'.<br>
<br>
Error in fminsearch (line 191)<br>
fv(:,1) = funfcn(x,varargin{:});<br>
<br>
Error in beamformer_sam (line 157)<br>
[opt_angle, fval, exitflag, output] = fminsearch('SAM_costfun',<br>
all_angles(min_ind), optim_options, vox_pos, tanu, tanv, lf, all_cov,<br>
inv_cov, noise_cov);<br>
<br>
Error in ft_sourceanalysis (line 849)<br>
dip(i) = beamformer_sam(grid, sens, vol, squeeze(avg(i,:,:)),<br>
squeeze(Cy(i,:,:)), optarg{:});<br>
************************<br>
<br>
</span></font>
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<div style="direction: ltr;" id="divRpF141022"><font color="#000000" face="Tahoma" size="2"><b>From:</b> fieldtrip-bounces@donders.ru.nl [fieldtrip-bounces@donders.ru.nl] on behalf of Yuval Harpaz [yuvharpaz@gmail.com]<br>
<b>Sent:</b> Friday, May 04, 2012 8:56 PM<br>
<b>To:</b> Email discussion list for the FieldTrip project<br>
<b>Subject:</b> Re: [FieldTrip] SAM option in ft_sourceanalysis<br>
</font>
<div>Dear Elena</div>
I used it recently with MEG data and local spheres model
<div>I don't think it could work with eeg but I don't know.</div>
Yuval<br>
</div>
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<div class="gmail_quote">On 4 May 2012 09:50, Elena Orekhova <span dir="ltr"><<a href="mailto:Elena.Orekhova@neuro.gu.se" target="_blank">Elena.Orekhova@neuro.gu.se</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex; border-left:1px #ccc solid; padding-left:1ex">
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<p class="MsoNormal">Dear fieldtrippers!</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I tried to use SAM beamformer for the EEG analysis,</p>
<p class="MsoNormal">But I have got en error (see below).<span> </span></p>
<p class="MsoNormal">I guess that there is a bug in ‘beamformer_sam’at line 112.
</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I wonder if ‘SAM’ option works at all?<span> </span>Did anybody used ‘SAM’ in ‘ft_sourceanalysis’?</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Thanks, </p>
<p class="MsoNormal">Elena</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">***********************</p>
<p class="MsoNormal">Error using<span> </span>* </p>
<p class="MsoNormal">Inner matrix dimensions must agree.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Error in beamformer_sam (line 112)</p>
<p class="MsoNormal">inv_cov = pinv(all_cov + lambda * eye(size(all_cov)));</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Error in ft_sourceanalysis (line 849)</p>
<p class="MsoNormal"><span> </span>dip(i) = beamformer_sam(grid, sens, vol, squeeze(avg(i,:,:)),</p>
<div style="border:none; border-bottom:dotted windowtext 3.0pt; padding:0cm 0cm 1.0pt 0cm">
<p class="MsoNormal" style="border:none; padding:0cm"><span> </span>squeeze(Cy(i,:,:)), optarg{:});</p>
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<p class="MsoNormal"> </p>
<p class="MsoNormal"> </p>
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</blockquote>
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-- <br>
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Y.Harpaz<br>
<br>
a link to the BIU MEG lab:<br>
<a href="http://faculty.biu.ac.il/%7Egoldsa/index.html" target="_blank">http://faculty.biu.ac.il/~goldsa/index.html</a></div>
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