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Hi Eva,
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<div class="">Allow me to point you to the discussion list’s archive. Specifically:</div>
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<div class=""><a href="https://mailman.science.ru.nl/pipermail/fieldtrip/2020-September/040261.html" class="">https://mailman.science.ru.nl/pipermail/fieldtrip/2020-September/040261.html</a></div>
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<div class="">and</div>
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<div class=""><a href="https://mailman.science.ru.nl/pipermail/fieldtrip/2019-July/039322.html" class="">https://mailman.science.ru.nl/pipermail/fieldtrip/2019-July/039322.html</a></div>
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<div class="">might be of relevance. In particular reason ‘2’, and Hints 1-3 in the 2019-July thread.</div>
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<div class="">I suggest to start from there. Don’t hesitate to ask questions if you keep being stuck.</div>
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<div class="">Best wishes,</div>
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<div class="">Jan-Mathijs</div>
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<div><br class="">
<blockquote type="cite" class="">
<div class="">On 23 Jun 2021, at 10:56, Eva Masson via fieldtrip <<a href="mailto:fieldtrip@science.ru.nl" class="">fieldtrip@science.ru.nl</a>> wrote:</div>
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Hi FieldTrip Community !</div>
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<o:p class=""> </o:p></div>
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I need your wisdom !</div>
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<o:p class=""> </o:p></div>
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I am trying to compute a time-frequency map of Granger causality for EEG data using a non parametric approach. To do so, I computed the Fourier Spectrum using the ‘mtmconvol’ method of ft_freqanalysis and I am now trying to feed it into ft_connectivityanalysis
using the ‘granger’ method. I get an error that I don’t understand.</div>
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<o:p class=""> </o:p></div>
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Here is the freq structure I’m trying to force into ft_connectivityanalysis :</div>
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<o:p class=""> </o:p></div>
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<i class="">freq =<o:p class=""></o:p></i></div>
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<i class=""> label: {2x1 cell}<o:p class=""></o:p></i></div>
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<i class=""> dimord: 'rpttap_chan_freq_time'<o:p class=""></o:p></i></div>
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<i class=""> freq: [1x64 double]<o:p class=""></o:p></i></div>
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<i class=""> time: [1x31 double]<o:p class=""></o:p></i></div>
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<i class=""> fourierspctrm: [4-D double]<o:p class=""></o:p></i></div>
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<i class=""> cumtapcnt: [1x64 double]<o:p class=""></o:p></i></div>
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<i class=""> cfg: [1x1 struct]<o:p class=""></o:p></i></div>
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<o:p class=""> </o:p></div>
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How I use ft_connectivityanalysis :</div>
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<o:p class=""> </o:p></div>
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<i class="">cfg = [];<o:p class=""></o:p></i></div>
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<i class="">cfg.method = 'granger';<o:p class=""></o:p></i></div>
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<i class=""><o:p class=""> </o:p></i></div>
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<i class="">granger = ft_connectivityanalysis(cfg, freq);<o:p class=""></o:p></i></div>
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<o:p class=""> </o:p></div>
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And the error message Matlab displays :</div>
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<o:p class=""> </o:p></div>
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<i class="">Error using zeros<o:p class=""></o:p></i></div>
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<i class="">Size inputs must be integers.<o:p class=""></o:p></i></div>
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<i class=""><o:p class=""> </o:p></i></div>
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<i class="">Error in sfactorization_wilson (line 63)<o:p class=""></o:p></i></div>
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<i class=""> S = cat(3, zeros(size(S,1), size(S,1), npad), S);<o:p class=""></o:p></i></div>
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<i class=""><o:p class=""> </o:p></i></div>
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<i class="">Error in ft_connectivity_csd2transfer (line 181)<o:p class=""></o:p></i></div>
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<i class=""> [Htmp, Ztmp, Stmp] = sfactorization_wilson(tmp, freq.freq, ...<o:p class=""></o:p></i></div>
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<i class=""><o:p class=""> </o:p></i></div>
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<i class="">Error in ft_connectivityanalysis (line 430)<o:p class=""></o:p></i></div>
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<i class=""> data = ft_connectivity_csd2transfer(data, optarg{:});<o:p class=""></o:p></i></div>
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<o:p class=""> </o:p></div>
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Can you enlighten me on this issue ?</div>
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Thanks a lot for your help !</div>
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<o:p class=""> </o:p></div>
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Cheers,</div>
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Eva</div>
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<o:p class=""> </o:p></div>
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<a href="https://urldefense.com/v3/__https://doi.org/10.1371/journal.pcbi.1002202__;!!HJOPV4FYYWzcc1jazlU!qiGEYEHKe1SGzejpmauk509nZ--Z4Kz2iPvDQADkIYXiiMXA-CB7Q_bwyauPUlI85lrykr_PYhdEsgo$" style="font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">https://urldefense.com/v3/__https://doi.org/10.1371/journal.pcbi.1002202__;!!HJOPV4FYYWzcc1jazlU!qiGEYEHKe1SGzejpmauk509nZ--Z4Kz2iPvDQADkIYXiiMXA-CB7Q_bwyauPUlI85lrykr_PYhdEsgo$</a><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class=""></span></div>
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