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<div style="font-size:12pt;color:#000000;background-color:#FFFFFF;font-family:Calibri,Arial,Helvetica,sans-serif;">
<p style="">Hello fieldtrip,<br>
</p>
<p style=""><br>
</p>
<p style="">I am trying to perform an LCMV beamformer on timelockanalysis data.<br>
</p>
<p style=""><br>
</p>
<p style="">timelock = <br>
</p>
<div> avg: [124x20517 double]</div>
<div> var: [124x20517 double]</div>
<div> time: [1x20517 double]</div>
<div> dof: [124x20517 double]</div>
<div> label: {1x124 cell}</div>
<div> dimord: 'chan_time'</div>
<div> cov: [124x124 double]</div>
<div> elec: [1x1 struct]</div>
<div style=""> cfg: [1x1 struct]<br>
</div>
<div style=""><br>
</div>
<div style="">I first run ft_prepare_leadfield<br>
</div>
<div style=""><br>
</div>
<div style="">
<div style=""><span> </span><span> </span><span> </span>cfg = [];</div>
<div> cfg.elec = timelock.elec;</div>
<div> cfg.vol = vol;</div>
<div style=""><span style="font-size: 12pt;"> cfg.grid.resolution = 1; % use a 3-D grid with a 1 cm resolution</span><br>
</div>
<div> cfg.grid.unit = 'cm';</div>
<div> cfg.normalize = 'yes'; % if you are not contrasting the activity of interest again another condition or baseline time-window</div>
<div style=""> grid = ft_prepare_leadfield( cfg);<br>
</div>
<div style=""><br>
</div>
<div style="">grid = <br>
</div>
<div style="">
<div> xgrid: [-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8]</div>
<div> ygrid: [-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7]</div>
<div> zgrid: [0 1 2 3 4 5 6 7 8 9 10 11 12]</div>
<div> dim: [14 14 13]</div>
<div> pos: [2548x3 double]</div>
<div> unit: 'cm'</div>
<div> inside: [1x1409 double]</div>
<div> outside: [1x1139 double]</div>
<div> cfg: [1x1 struct]</div>
<div style=""> leadfield: {1x2548 cell}<br>
</div>
<div style=""><br>
</div>
<div style="">I then try to run the ft_sourceanalysis code:<br>
</div>
<div style="">
<div style=""><span style="font-size: 12pt;"> </span></div>
<div style="">
<div style=""><span> </span><span> </span><span> </span>cfg = [];</div>
<div> cfg.channel = timelock.label;</div>
<div> cfg.method = 'lcmv';</div>
<div> cfg.grid = grid;</div>
<div> cfg.vol = vol;</div>
<div> cfg.keepfilter = 'yes';</div>
<div style=""> source = ft_sourceanalysis( cfg, timelock);<br>
</div>
<br>
</div>
<br>
</div>
And it crashes with the error message:<br>
</div>
<div style=""><br>
</div>
<div style="">
<div>Error using * </div>
<div>Inner matrix dimensions must agree.</div>
<div><br>
</div>
<div>Error in beamformer_lcmv (line 268)</div>
<div> filt = pinv(lf' * invCy * lf) * lf' * invCy; % van Veen eqn. 23, use PINV/SVD to</div>
<div> cover rank deficient leadfield</div>
<div><br>
</div>
<div>Error in ft_sourceanalysis (line 794)</div>
<div style=""> dip(i) = beamformer_lcmv(grid, sens, vol, squeeze_avg, squeeze(Cy(i,:,:)), optarg{:});<br>
</div>
<div style=""><br>
</div>
<div style=""><br>
</div>
<div style=""><br>
</div>
<div style="">However, the code does work if it is:<br>
</div>
<div style=""><br>
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<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);">
<span> </span><span> </span><span> </span>cfg = [];</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);">
cfg.channel = timelock.label;</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);">
cfg.method = 'lcmv';</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);">
cfg.grid.inside = grid.inside;</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);">
cfg.vol = vol;</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);">
cfg.keepfilter = 'yes';</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);">
source = ft_sourceanalysis( cfg, timelock);<br>
</div>
<br>
</div>
However, I run the sourceplot code produces something that looks like the picture attached.<br>
</div>
<div style=""><br>
</div>
<div style="">What is interesting is that when I run the interp code:<br>
</div>
<div style=""><br>
</div>
<div style="">
<div style=""><span> </span>the input is source data with 16777216 positions on a [256 256 256] grid</div>
<div style=""><span> </span>not plotting anatomy<br>
</div>
</div>
<div style=""><br>
</div>
<div style="">But when you run the same code from sourcePost_nocon from the beamformer tutorial, you get the following when you run the code:<br>
</div>
<div style=""><br>
</div>
<div style="">
<div style=""><span> </span>the input is source data with 3042 positions on a [18 13 13] grid</div>
<div style=""><span> </span>the input is volume data with dimensions [256 256 256]<br>
</div>
<div style=""><br>
</div>
<div style="">I have used the same mri file for both.<br>
</div>
<br>
</div>
<div style="">Please help, I cant work out the issue.<br>
</div>
<div style=""><br>
</div>
<div style="">Tyler<br>
</div>
<p style=""><br>
</p>
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<div style="font-size:13px">*************************
<div style="font-family:Tahoma"><br>
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<div><font face="Arial"><i>Tyler Grummett ( BBSc, BSc(Hons I))</i></font></div>
<div><font face="Arial"><i>PhD Candidate</i></font></div>
<div><font face="Arial"><i>Brain Signals Laboratory</i></font></div>
<div><font face="Arial"><i>Flinders University</i></font></div>
<div><font face="Arial"><i>Rm 5A301</i></font></div>
<div><font face="Arial"><i>Ext 66124</i></font></div>
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