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    Dear Hweeling,<br>
    we use the following code:<br>
    <blockquote><tt>        % Make 23 logarithmical spaced .25-octave
        frequencies</tt><br>
      <tt>        cfg.foi = logspace(log10(4),log10(181),23);</tt><br>
      <tt>        cfg.foi = round(cfg.foi.*100)./100; % optional
        rounding to get nice round 4,8,16...64Hz </tt><br>
      <tt>        % The windows should have 3/4 octave smoothing in
        frequency domain</tt><br>
      <tt>        cfg.tapsmofrq = (cfg.foi*2^((3/4)/2) -
        cfg.foi*2^((-3/4)/2)) /2; % /2 because fieldtrip takes +-
        tapsmofrq</tt>    <br>
      <tt>        </tt><br>
      <tt>        % The timewindow should be so, that for freqs below
        16, it results in n=1</tt><br>
      <tt>        % Taper used, but for frequencies higher, it should be
        a constant 250ms.</tt><br>
      <tt>        % To get the number of tapers we use: 
        round(cfg.tapsmofrq*2.*cfg.t_ftimwin-1)</tt><br>
      <tt>        cfg.t_ftimwin =
[2./(cfg.tapsmofrq(cfg.foi<16)*2),repmat(0.25,1,length(cfg.foi(cfg.foi>=16)))];</tt><br>
    </blockquote>
    <br>
    I guess the first line is the answer to your question.<br>
    I hope this bit of code helps.<br>
    Best,<br>
    Benedikt<br>
    <br>
    <div class="moz-cite-prefix">Am 02.02.2015 um 09:24 schrieb Hwee
      Ling Lee:<br>
    </div>
    <blockquote
cite="mid:CABG7z0QtTXsoLuZu0kMwAuCK0YAC7=5bhsk+5CvCt3rHudb8vw@mail.gmail.com"
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            <div>Dear all,</div>
            <div><br>
            </div>
            <div>I've got a basic question regarding spectral analysis.</div>
            <div><br>
            </div>
            <div>In Hipp's neuron paper, it was mentioned that "spectral
              estimates were computed across 23 logarithmically scaled
              frequencies from 4 -  181 Hz (0.25 octave steps)". May I
              know how can one implement this using Fieldtrip?</div>
            <div><br>
            </div>
            <div>Thanks.</div>
            <div><br>
            </div>
            <div>Best regards,</div>
            <div>Hweeling</div>
            <div><br>
            </div>
            <div><br>
            </div>
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      <pre wrap="">_______________________________________________
fieldtrip mailing list
<a class="moz-txt-link-abbreviated" href="mailto:fieldtrip@donders.ru.nl">fieldtrip@donders.ru.nl</a>
<a class="moz-txt-link-freetext" href="http://mailman.science.ru.nl/mailman/listinfo/fieldtrip">http://mailman.science.ru.nl/mailman/listinfo/fieldtrip</a></pre>
    </blockquote>
    <br>
  
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