<div dir="ltr"><div dir="ltr">Dear Todd Calnan, <div><br></div><div>As I know, the output for the mtmfft method depends on the length of the time window of your interest. To calculate your output frequencies, you may check this link: </div><div><a href="https://www.fieldtriptoolbox.org/faq/why_does_my_output.freq_not_match_my_cfg.foi_when_using_mtmfft_in_ft_freqanalyis/">https://www.fieldtriptoolbox.org/faq/why_does_my_output.freq_not_match_my_cfg.foi_when_using_mtmfft_in_ft_freqanalyis/</a> <br></div><div><br></div><div>However, you may also consider to apply other ft_freqanalysis methods( e.g. wavelets or hannings) to obtain power for non-integer frequency values. </div><div><br></div><div>Hope it helps, </div><div>Best wishes,</div><div>Mustafa</div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Todd Calnan <<a href="mailto:tcalnan2@gmail.com">tcalnan2@gmail.com</a>>, 20 Eki 2020 Sal, 23:31 tarihinde şunu yazdı:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div style="margin:0px;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;font-size:12pt;line-height:inherit;font-family:Calibri,Arial,Helvetica,sans-serif;vertical-align:baseline;color:rgb(0,0,0)">Dear FieldTrippers,</div><div style="margin:0px;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;font-size:12pt;line-height:inherit;font-family:Calibri,Arial,Helvetica,sans-serif;vertical-align:baseline;color:rgb(0,0,0)"><div style="margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;color:inherit"><br></div><div style="margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;color:inherit">I am working on calculating EEG frequency band ratios (ie beta-gamma ratio) using the results of ft_freqanalysis on my dataset. However, I am trying to include non-integer frequencies so that there is no overlap between the bands, so that beta will go from 13.0 to 29.9 Hz and gamma will go from 30.0 to 54.9 Hz. When I try to set this up in the cfg variable for ft_freqanalysis (attempting to do the inverse of the fieldtrip spectral analysis tutorial), using</div><div style="margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;color:inherit"><br></div><div style="margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;color:inherit">    cfg.method = 'mtmfft';</div><div style="margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;color:inherit">    cfg.pad    = 'maxperlen';</div><div style="margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;color:inherit">    cfg.taper  = 'hanning';</div><div style="margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;color:inherit">    cfg.foi = 1:0.1:100;    % go from 1 Hz to 100 Hz in 0.1 Hz intervals</div><div style="margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;color:inherit">    cfg.trials = 'all';</div><div style="margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;color:inherit">    cfg.output = 'powandcsd';</div><div style="margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;color:inherit">    cfg.keeptrials = 'yes';</div><div style="margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;color:inherit">    cfg.channel = (1:39)';</div><div style="margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;color:inherit"><br></div><div style="margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;color:inherit">I still only end up with the 100 frequencies, rather than the 1000 that I was hoping for.</div><div style="margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;color:inherit"><br></div><div style="margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;color:inherit">Is it possible to break up the frequencies in ft_freqanalysis by more than 1 Hz bins to allow for more discrete analysis?</div><div style="margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;color:inherit"><br></div><div style="margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;color:inherit">Thank you for any help.</div><div style="margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;color:inherit"><br></div>-Todd Calnan</div><div style="margin:0px;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;font-size:12pt;line-height:inherit;font-family:Calibri,Arial,Helvetica,sans-serif;vertical-align:baseline;color:rgb(0,0,0)"><br></div><div style="margin:0px;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;font-size:12pt;line-height:inherit;font-family:Calibri,Arial,Helvetica,sans-serif;vertical-align:baseline;color:rgb(0,0,0)"><div style="margin:0px;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;font-size:14px;line-height:inherit;font-family:Calibri,sans-serif;vertical-align:baseline"><b>Todd M. Calnan</b></div><div style="margin:0px;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;font-size:14px;line-height:inherit;font-family:Calibri,sans-serif;vertical-align:baseline">Database Analyst</div><div style="margin:0px;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;font-size:14px;line-height:inherit;font-family:Calibri,sans-serif;vertical-align:baseline">Duke Center for Autism and Brain Development</div><div style="margin:0px;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;font-size:14px;line-height:inherit;font-family:Calibri,sans-serif;vertical-align:baseline">Duke University School of Medicine</div><div style="margin:0px;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-stretch:inherit;font-size:14px;line-height:inherit;font-family:Calibri,sans-serif;vertical-align:baseline"><a href="mailto:todd.calnan@dm.duke.edu" target="_blank">todd.calnan@dm.duke.edu</a></div></div></div>
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