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Yes, you need to add a singleton dimension, to ensure that the result will be rpt_chan_freq_time, even if there’s only a single channel.
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<div class="">Good luck,</div>
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<div class="">On 6 Feb 2024, at 13:29, Knut-André Skaug via fieldtrip <<a href="mailto:fieldtrip@science.ru.nl" class="">fieldtrip@science.ru.nl</a>> wrote:</div>
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Hi Jan-Mathijs<o:p class=""></o:p></div>
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Thank you for the suggestion.<span class="Apple-converted-space"> </span><o:p class=""></o:p></div>
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Just so I can understand better: do you suggest to add a singleton to the datamatrix before permuting the dimensions?<o:p class=""></o:p></div>
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I would like to use the cluster-correction method in fieldtrip at single-subject level to test between condition differences in time-frequency.<o:p class=""></o:p></div>
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Would it be correct to permute: ‘rpt_freq_time’ ?<span class="Apple-converted-space"> </span><o:p class=""></o:p></div>
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Kind regards<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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<b class="">From:</b><span class="Apple-converted-space"> </span>fieldtrip <<a href="mailto:fieldtrip-bounces@science.ru.nl" class="">fieldtrip-bounces@science.ru.nl</a>><span class="Apple-converted-space"> </span><b class="">On Behalf Of<span class="Apple-converted-space"> </span></b>Schoffelen,
J.M. (Jan Mathijs) via fieldtrip<br class="">
<b class="">Sent:</b><span class="Apple-converted-space"> </span>Wednesday, December 6, 2023 9:16 AM<br class="">
<b class="">To:</b><span class="Apple-converted-space"> </span>FieldTrip discussion list <<a href="mailto:fieldtrip@science.ru.nl" class="">fieldtrip@science.ru.nl</a>><br class="">
<b class="">Cc:</b><span class="Apple-converted-space"> </span>Schoffelen, J.M. (Jan Mathijs) <<a href="mailto:janmathijs.schoffelen@donders.ru.nl" class="">janmathijs.schoffelen@donders.ru.nl</a>><br class="">
<b class="">Subject:</b><span class="Apple-converted-space"> </span>Re: [FieldTrip] Question about dataformat when using cluster based permutation testing on time-frequency data<o:p class=""></o:p></div>
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Hi Knut-André, <span class="Apple-converted-space"> </span><o:p class=""></o:p></div>
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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:<o:p class=""></o:p></div>
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G.dimord = ‘rpt_chan_freq_time’;<o:p class=""></o:p></div>
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G.powspctrm = permute(shiftdim(tf_datamatrix,-1),[4 1 2 3]);<o:p class=""></o:p></div>
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G.freq = frex;<o:p class=""></o:p></div>
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G.time = <the time-axis, consisting of a vector with the number of points along the fourth dimension of the powspctrm matrix>;<o:p class=""></o:p></div>
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G.label = {‘harry_hole’};<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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Best wishes,<o:p class=""></o:p></div>
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Jan-Mathijs<o:p class=""></o:p></div>
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On 4 Dec 2023, at 10:21, Knut-André Skaug via fieldtrip <<a href="mailto:fieldtrip@science.ru.nl" style="color: blue; text-decoration: underline;" class="">fieldtrip@science.ru.nl</a>> wrote:<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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Hello,<span class="apple-converted-space"> </span><o:p class=""></o:p></div>
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Thank you for providing this toolbox.<span class="apple-converted-space"> </span><o:p class=""></o:p></div>
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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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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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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>
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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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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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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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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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