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<p>Hello FieldTrip community,<br>
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<p>I'm working through the Beamformer tutorial on this page (<a title="Ctrl+Click or tap to follow the link" id="LPlnk933248" href="http://www.fieldtriptoolbox.org/tutorial/beamformer">http://www.fieldtriptoolbox.org/tutorial/beamformer</a>) using MEG data
from a saccade task.<a title="Ctrl+Click or tap to follow the link" id="LPlnk923360" href="http://www.fieldtriptoolbox.org/tutorial/beamformer"></a></p>
<p><a id="LPlnk923360" href="http://www.fieldtriptoolbox.org/tutorial/beamformer"><br>
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<p>This code for constructing the head model, copied from the page, is giving me an error:
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<div> % forward model mri<br>
segmentedmri = load('C:\Users\EEG1\Documents\Data\segmentedmri.mat');<br>
cfg = [];<br>
cfg.method = 'singleshell';<br>
headmodel = ft_prepare_headmodel(cfg, segmentedmri);</div>
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<p>This is the complete text of the error: <br>
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<div>Error using ft_convert_units (line 150)<br>
cannot determine geometrical units<br>
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Error in ft_checkdata (line 543)<br>
data = ft_convert_units(data);<br>
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Error in ft_prepare_headmodel (line 203)<br>
data = ft_checkdata(data, 'hasunit', 'yes');<br>
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Error in LindseysBF (line 48)<br>
headmodel = ft_prepare_headmodel(cfg, segmentedmri);<br>
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When I check the struct segmentedmri, it has a field called unit with a value of 'mm.' Because this code is using a file downloaded from the tutorial (i.e., segmentedmri, which can be downloaded from the link above) and is copy/pasted from the tutorial page,
I can't figure out what's wrong or what to investigate. Can someone tell me if I'm making an error in the code, if there's something I could change about the code to make it work, or if this is a bug? Any help would be greatly appreciated.<br>
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Thank you,<br>
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Lindsey Tate<br>
Graduate Research Assistant <br>
Brian and Biomarker Lab<br>
University of Oklahoma<br>
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