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<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB">Hi, </span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> </span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB">I hope this email finds you well. I have a question about obtaining one power value per parcel after using ft_virtualchannel. I
guess there must be a way to create a dummy struct that could solve this problem, so apologies if there is a straightforward answer, but I am finding it hard to obtain one value per parcel after interpolating source data onto an atlas and running ft_virtualchannel.</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> </span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB">I run ft_virtualchannel instead of ft_sourceparcellate because I want to keep trial information which I couldn’t keep with the output
of ft_sourceparcellate. The output of ft_virtualchannel that I obtain through this looks like: </span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> </span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> struct with fields:</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> </span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> trial: [142×246×1018 double]</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> time: [1×1018 double]</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> dimord: 'rpt_chan_time'</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> label: {246×1 cell}</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> cfg: [1×1 struct]</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> grad: [1×1 struct]</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> sampleinfo: [142×2 double]</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> trialinfo: [142×2 double]</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> brainordinate: [1×1 struct]</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> </span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="background:white"><span style="color:black;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> </span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB">After I use some fields from a previously generated average of alpha power along with fields from the ft_virtualchannel output to
create the following dummy source struct:</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> </span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> trial: [142×246 double]</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> time: 0</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> cfg: [1×1 struct]</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> dim: [26 33 28]</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> pos: [24024×3 double]</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> pow: [24024×1 double]</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> </span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB">The data is collapsed across time, but the pow field is the multiplication of the dimensions of the tissue (26 * 33 * 28), rather
than a value per parcel.</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> </span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB">I know from the Fieldtrip tutorials online that the output of ft_sourceparcellate can look like this:</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> </span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="color:black;background:white;mso-fareast-language:EN-GB">parcel =</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="color:black;background:white;mso-fareast-language:EN-GB"> label: {1x116 cell} % brain parcels labels</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> </span><span style="color:black;background:white;mso-fareast-language:EN-GB"> anatomy: [116x1 double]</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> </span><span style="color:black;background:white;mso-fareast-language:EN-GB">anatomydimord: 'chan_unknown'</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="color:black;background:white;mso-fareast-language:EN-GB"> pow: [116x1 double] % one value of brain activity per parcel</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> </span><span style="color:black;background:white;mso-fareast-language:EN-GB"> powdimord: 'chan'</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> </span><span style="color:black;background:white;mso-fareast-language:EN-GB">brainordinate: [1x1 struct]</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="color:black;background:white;mso-fareast-language:EN-GB"> cfg: [1x1 struct]</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="color:black;background:white;mso-fareast-language:EN-GB"> </span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="color:black;background:white;mso-fareast-language:EN-GB"> </span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB">I’m wondering if you could perhaps point me to the most effective way to replicate this output/reshape the output of ft_virtualchannel
or somehow with ft_virtualchannel in the easiest possible way obtain one value per parcel. Essentially, I’m most interested in replicating or obtaining the ‘pow’ field from the ft_sourceparcellate output where I would have one power or activity estimate per
parcel.</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> </span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> </span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB">I hope the question makes sense, and I can of course elaborate or explain further if not. Either way, thanks a lot in advance!</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> </span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB"> </span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB">All the best, </span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="EN-US" style="color:black;background:white;mso-fareast-language:EN-GB">Marta</span><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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