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Hi Knut-André,
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<div class="">I think that this can be solved if you do your best to be a bit more work into shaping your data structure into something that Fieldtrip likes:</div>
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<div class="">G.dimord = ‘rpt_chan_freq_time’;</div>
<div class="">G.powspctrm = permute(shiftdim(tf_datamatrix,-1),[4 1 2 3]);</div>
<div class="">G.freq = frex;</div>
<div class="">G.time = <the time-axis, consisting of a vector with the number of points along the fourth dimension of the powspctrm matrix>;</div>
<div class="">G.label = {‘harry_hole’};</div>
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<div>Best wishes,</div>
<div>Jan-Mathijs</div>
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<blockquote type="cite" class="">
<div class="">On 4 Dec 2023, at 10:21, Knut-André Skaug via fieldtrip <<a href="mailto:fieldtrip@science.ru.nl" class="">fieldtrip@science.ru.nl</a>> wrote:</div>
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Hello,<span class="Apple-converted-space"> </span><o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
<div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
Thank you for providing this toolbox.<span class="Apple-converted-space"> </span><o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
<div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
My question pertains to the data format in order to run permutation testing on time-frequency data in source space.<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
<div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
Because I have already extracted the time-frequency data matrix I wish to continue with the function ft_freqanalysis to run cluster-corrected permutation testing.<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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The time-frequency data matrix have dimensions: Frequency x Time x Trials.<o:p class=""></o:p></div>
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Thus, there are no channels in this matrix.<span class="Apple-converted-space"> </span><o:p class=""></o:p></div>
<div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
I’ve tried to set the data structure to be:<span class="Apple-converted-space"> </span><o:p class=""></o:p></div>
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G.dimord = ‘freq_time_rpt’;<o:p class=""></o:p></div>
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G.powspctrm = tf_datamatrix;<o:p class=""></o:p></div>
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G.freq = frex;<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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But this returns an error message when following the tutorial on cluster-based permutation testing – between trials – both on event-related fields and time-frequency data.<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
<div style="margin: 0cm; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
How can I carry out cluster-based permutation testing on my two time-frequency matrices, Condition A and Condition B?<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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Kind regards<span class="Apple-converted-space"> </span><o:p class=""></o:p></div>
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Knut<span class="Apple-converted-space"> </span><o:p class=""></o:p></div>
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