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<div class="">Hi Andreas,</div>
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<div class="">I think that the reason why ft_selectdata removes the ‘pow’-field is due to its overzealous bookkeeping. The data-structure you mentioned in a previous e-mail is not fully internally consistent (probably not your fault, by the way). Although it
lacks a proper ‘dimord’ field, which specifies how the primary numeric data should be interpreted (in your case you probably want it to be: ‘subj_pos’), it also contains a ‘time’ field. In the absence of the dimord, FT is trying to create one from the data
structure, and I suspect that the presence of the time-field will lead to something like ‘subj_pos_time’ or so. Subsequently, ft_seletdata only passes on those numeric data fields that are consistent with this dimord, which does not include pow. Anyway, my
hunch is that if you do a rmfield(data,’time’), prior to calling ft_sourcestatistics the old-fashioned way (i.e. with the data being passed through ft_sourcegrandaverage), it may work as well.</div>
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<div class="">Best,</div>
<div class="">Jan-Mathijs</div>
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<div class="">On 02 May 2016, at 15:27, Andreas Sauer <<a href="mailto:sauer.mpih@googlemail.com" class="">sauer.mpih@googlemail.com</a>> wrote:</div>
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<div dir="ltr" class="">Dear Jan-Mathijs,
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<div class="">thanks for your reply! </div>
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<div class="">In the meantime, another colleague also suggested to use a different syntax and that worked! I still don't understand, why ft_selectdata removes the "pow" field, but I can go on calculating my stats :-) . </div>
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<div class="">Best wishes,</div>
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<div class="">Andreas</div>
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<div class="gmail_quote">2016-05-01 18:52 GMT+02:00 Schoffelen, J.M. (Jan Mathijs)
<span dir="ltr" class=""><<a href="mailto:jan.schoffelen@donders.ru.nl" target="_blank" class="">jan.schoffelen@donders.ru.nl</a>></span>:<br class="">
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<div class="">Dear Andreas,</div>
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Have you tried it with a more recent version? Also, I would recommend not to use ft_sourcegrandaverage, but to use the syntax ft_sourcestatistics(cfg, source1{:}, source2{:}), assuming you have the single subject data represented in a cell-array of structures,
with source1 for condition 1 and source2 for condition 2.
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<div class="">Best,</div>
<div class="">Jan-Mathijs</div>
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<div class="">On 24 Apr 2016, at 18:36, Andreas Sauer <<a href="mailto:sauer.mpih@googlemail.com" target="_blank" class="">sauer.mpih@googlemail.com</a>> wrote:</div>
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<span class="">Dear all,</span></div>
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<span class="">unfortunately, I am having problems to run source statistics on ERF mismatch negativity data (recorded with a 4D system). </span></div>
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<span class="">With the following data structure as input (output from ft_sourcegrandaverage), fieldtrip gives a warning that it „could not determine dimord of „pow“ in the following data“</span></div>
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<span class="">pow: [16x37696 double]</span></div>
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<span class="">dim: [31 38 32]</span></div>
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<span class="">inside: [37696x1 logical]</span></div>
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<span class="">pos: [37696x3 double]</span></div>
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<span class="">time: [1x900 double]</span></div>
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<span class="">cfg: [1x1 struct]</span></div>
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<span class="">and later throws an error that „field „pow“ (is) not present in data“. I checked the ft_sourcestatistic script step by step and found out that ft_selectdata removes it after being called by ft_sourcestatistics.</span></div>
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<span class="">I am using the fieldtrip version from 15/05/2015. I also tried with older versions, one from late 2014 and late 2013, but nothing worked.</span></div>
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<span class="">Unfortunately, since ft_selectdata removes the field "pow" from the data during the call to ft_sourcestatistic, I can’t put it back in to the structure. </span></div>
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<span class="">Any help with this (esp. why „pow“ is being removed) is highly appreciated!</span></div>
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<span class="">Thanks and best wishes,</span></div>
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<span class="">Andreas</span></div>
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-- <br class="">
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<div class="">Dipl.-Psych. Andreas Sauer</div>
<div class="">Max Planck Institute for Brain Research</div>
<div class="">Deutschordenstraße 46</div>
<div class="">60528 Frankfurt am Main</div>
<div class="">Germany</div>
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<div class="">T: <a href="tel:%2B49%2069%2096769%20278" value="+496996769278" target="_blank" class="">
+49 69 96769 278</a></div>
<div class="">F: <a href="tel:%2B49%2069%2096769%20327" value="+496996769327" target="_blank" class="">
+49 69 96769 327</a></div>
<div class="">Email: <a href="mailto:sauer.mpih@gmail.com" target="_blank" class="">
sauer.mpih@gmail.com</a></div>
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<div class="">Dipl.-Psych. Andreas Sauer</div>
<div class="">Max Planck Institute for Brain Research</div>
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<div class="">60528 Frankfurt am Main</div>
<div class="">Germany</div>
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