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Hi Jack,
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<div class="">I don’t fully understand what you mean with single- or double-sided, but the basic output from Fieldtrip is the spectrum from 0-Nyquist, where the spectral quantities are normalised with sqrt(2/nsmp); the ‘2’ is to account for the negative frequencies.
The correction step that you refer to in l.846-854 is to counteract the factor 2, because the DC and Nyquist frequency bins occur only once in the FFT output.</div>
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<div class="">Best wishes,</div>
<div class="">Jan-Mathijs</div>
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<div class="">On 4 May 2021, at 03:41, Jack Fogarty <<a href="mailto:jf752@uowmail.edu.au" class="">jf752@uowmail.edu.au</a>> wrote:</div>
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Hi Fieldtrip team,<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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Could you please clarify, do the ‘ft_freqanalysis’ or ‘ft_specest_mtmfft’ functions output data reflecting the single or double-sided fourier spectrum? The lines 846-854 in ft_freqanalysis suggests to me it should be single-sided – is that correct?<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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<span style="color: rgb(85, 142, 213);" class=""> % correct the 0 Hz or Nyqist bin if present, scaling with a factor of 2 is only appropriate for ~0 Hz<o:p class=""></o:p></span></div>
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<span style="color: rgb(85, 142, 213);" class=""> if ~isempty(hasdc_nyq)<o:p class=""></o:p></span></div>
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<span style="color: rgb(85, 142, 213);" class=""> if keeprpt>1<o:p class=""></o:p></span></div>
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<span style="color: rgb(85, 142, 213);" class=""> fourierspctrm(:,:,hasdc_nyq,:) = fourierspctrm(:,:,hasdc_nyq,:)./sqrt(2);<o:p class=""></o:p></span></div>
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<span style="color: rgb(85, 142, 213);" class=""> else<o:p class=""></o:p></span></div>
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<span style="color: rgb(85, 142, 213);" class=""> fourierspctrm(:,hasdc_nyq,:) = fourierspctrm(:,hasdc_nyq,:)./sqrt(2);<o:p class=""></o:p></span></div>
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<span style="color: rgb(85, 142, 213);" class=""> end<o:p class=""></o:p></span></div>
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<span style="color: rgb(85, 142, 213);" class=""> end<o:p class=""></o:p></span></div>
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<span style="color: rgb(85, 142, 213);" class=""> freq.fourierspctrm = fourierspctrm;<o:p class=""></o:p></span></div>
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<o:p class=""> </o:p></div>
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<o:p class=""> </o:p></div>
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Best,<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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<span class="">Jack Fogarty, PhD<o:p class=""></o:p></span></div>
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<span class="">Postdoctoral Research Officer<o:p class=""></o:p></span></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!qINdjeh1UTIFU2LkaE6z2ycCzrh_BDR7bl7WEt6Hqmbio_8Nz9Gbj0hgUltzns2FdV4m09qC$" style="font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">https://urldefense.com/v3/__https://doi.org/10.1371/journal.pcbi.1002202__;!!HJOPV4FYYWzcc1jazlU!qINdjeh1UTIFU2LkaE6z2ycCzrh_BDR7bl7WEt6Hqmbio_8Nz9Gbj0hgUltzns2FdV4m09qC$</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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