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    <div class="moz-cite-prefix">Dear Johanna,<br>
      <br>
      the problem is that the trial length you put into freqanalysis
      differed across subjects, leading to a different frequency
      resolution across participants. FieldTrip realizes that and errors
      because 1.9998 is not 2.0001 ;) I would propose you re-do the
      frequencyanalysis with the same time window/trial length for all
      participants.<br>
      Maybe you should first check why your trials have different
      lengths and if that is desired or you did another mistake
      somewhere in your analysis. If you want to different trial
      lengths, you can use a padding cfg option in ft_freqanalysis to
      pad trials to a fixed length.<br>
      <br>
      Good luck ;)<br>
      <br>
      Best,<br>
      Jörn<br>
      <br>
      On 7/22/2013 2:40 PM, Johanna Fieß wrote:<br>
    </div>
    <blockquote
      cite="mid:37D727CC-499E-4D25-B975-BAC49D255F53@uni-konstanz.de"
      type="cite">Dear all, 
      <div><br>
      </div>
      <div>whenever I try to compute the statistics for
        (MEG) time-frequency data, this error message comes up:</div>
      <div><br>
      </div>
      <div>
        <div>
          <div>computing statistic over the frequency range [8.000
            11.000]</div>
          <div>computing statistic over the time range [0.300 1.100]</div>
        </div>
        <div><font class="Apple-style-span" color="#e61610">Error using
            ft_appendfreq (line 250)</font></div>
        <div><font class="Apple-style-span" color="#e61610">the input
            data structures have non-unique frequency bins,
            concatenation across frequency is not possible</font></div>
        <div><font class="Apple-style-span" color="#e61610"><br>
          </font></div>
        <div><font class="Apple-style-span" color="#e61610">Error in
            ft_appendfreq (line 139)</font></div>
        <div><font class="Apple-style-span" color="#e61610">      freq =
            ft_appendfreq(tmpcfg, varargin{:});</font></div>
        <div><font class="Apple-style-span" color="#e61610"><br>
          </font></div>
        <div><font class="Apple-style-span" color="#e61610">Error in
            ft_freqstatistics (line 231)</font></div>
        <div><font class="Apple-style-span" color="#e61610">    data =
            ft_appendfreq(cfg, varargin{:});</font></div>
        <div><br>
        </div>
        <div>
          <div>Out of 35 participants in total, (only) three show
            slightly different frequency bins (starting point 2.0001
            instead of 1.9998) – if I remove them from the average, the
            error message disappears.</div>
          <div>If renaming the freq-structure of those three
            participants, the error message disappears, too.</div>
        </div>
        <div><br>
        </div>
        <div>Could anyone tell me what causes this problem or how I
          should handle it?<br>
          <br>
          Thanks a lot in advance!<br>
          <br>
          Johanna</div>
        <div><br>
        </div>
        <div><br>
        </div>
        PS: I'm running Matlab R2012b & fieldtrip-20130515<br>
        <div apple-content-edited="true">
          <div apple-content-edited="true"><span class="Apple-tab-span"
              style="white-space: pre; "> </span></div>
          <div apple-content-edited="true">
            <div apple-content-edited="true"><span
                class="Apple-tab-span" style="white-space: pre; "> </span>%%
              stats</div>
            <div apple-content-edited="true"><span
                class="Apple-tab-span" style="white-space: pre; "> </span>design=[1:10,1:10;
              ones(1,10),ones(1,10)*2]; </div>
            <div apple-content-edited="true"><br>
            </div>
            <div apple-content-edited="true"><span
                class="Apple-tab-span" style="white-space: pre; "> </span>cfg
              = [];</div>
            <div apple-content-edited="true"><span
                class="Apple-tab-span" style="white-space: pre; "> </span>cfg.frequency
                    <span class="Apple-tab-span"
                style="white-space:pre"> </span>= <span
                class="Apple-tab-span" style="white-space:pre"> </span> [8
              11]; </div>
            <div apple-content-edited="true"><span
                class="Apple-tab-span" style="white-space: pre; "> </span>cfg.latency
                     <span class="Apple-tab-span"
                style="white-space:pre"> </span>= <span
                class="Apple-tab-span" style="white-space:pre"> </span> [.3
              1.1];    </div>
            <div apple-content-edited="true"><span
                class="Apple-tab-span" style="white-space: pre; "> </span>cfg.method
                       <span class="Apple-tab-span"
                style="white-space:pre"> </span>= <span
                class="Apple-tab-span" style="white-space:pre"> </span>'montecarlo';</div>
            <div apple-content-edited="true"><span
                class="Apple-tab-span" style="white-space: pre; "> </span>cfg.statistic
                    <span class="Apple-tab-span"
                style="white-space:pre"> </span>= <span
                class="Apple-tab-span" style="white-space:pre"> </span>'indepsamplesT'; </div>
            <div apple-content-edited="true"><span
                class="Apple-tab-span" style="white-space: pre; "> </span>cfg.correctm
                     <span class="Apple-tab-span"
                style="white-space:pre"> </span>= <span
                class="Apple-tab-span" style="white-space:pre"> </span>'cluster';</div>
            <div apple-content-edited="true"><span
                class="Apple-tab-span" style="white-space: pre; "> </span>cfg.clustertail
                  <span class="Apple-tab-span" style="white-space:pre">
              </span>=<span class="Apple-tab-span"
                style="white-space:pre"> </span> 0;</div>
            <div apple-content-edited="true"><span
                class="Apple-tab-span" style="white-space: pre; "> </span>cfg.clusteralpha
                <span class="Apple-tab-span" style="white-space:pre"> </span>=
              <span class="Apple-tab-span" style="white-space:pre"> </span>0.05;</div>
            <div apple-content-edited="true"><span
                class="Apple-tab-span" style="white-space: pre; "> </span>cfg.clusterstatistic
              = 'maxsum';</div>
            <div apple-content-edited="true"><span
                class="Apple-tab-span" style="white-space: pre; "> </span>cfg.numrandomization
              = 500;</div>
            <div apple-content-edited="true"><span
                class="Apple-tab-span" style="white-space: pre; "> </span>cfg.alpha
                        <span class="Apple-tab-span"
                style="white-space:pre"> </span> = <span
                class="Apple-tab-span" style="white-space:pre"> </span>0.05;</div>
            <div apple-content-edited="true"><br>
            </div>
            <div apple-content-edited="true"><span
                class="Apple-tab-span" style="white-space: pre; "> </span>cfg.avgoverfreq
                  = 'yes';</div>
            <div apple-content-edited="true"><span
                class="Apple-tab-span" style="white-space: pre; "> </span>%
              cfg.avgovertime     = 'yes';</div>
            <div apple-content-edited="true"><span
                class="Apple-tab-span" style="white-space: pre; "> </span>cfg.design
                      <span class="Apple-tab-span"
                style="white-space:pre"> </span> = design;</div>
            <div apple-content-edited="true"><span
                class="Apple-tab-span" style="white-space: pre; "> </span>cfg.neighbours
                   = neighbours; </div>
            <div apple-content-edited="true"><span
                class="Apple-tab-span" style="white-space: pre; "> </span>cfg.ivar
              <span class="Apple-tab-span" style="white-space:pre"> </span> =
              2;</div>
            <div apple-content-edited="true"><br>
            </div>
            <div apple-content-edited="true"><br>
            </div>
            <div apple-content-edited="true"><span
                class="Apple-tab-span" style="white-space: pre; "> </span>stat
              = ft_freqstatistics (cfg,patUr{:}, konUr{:});  </div>
            <div apple-content-edited="true"><span
                class="Apple-tab-span" style="white-space: pre; "> </span>cfg
              = [];</div>
            <div apple-content-edited="true"><span
                class="Apple-tab-span" style="white-space: pre; "> </span>cfg.alpha
               = 0.3;</div>
            <div apple-content-edited="true"><span
                class="Apple-tab-span" style="white-space: pre; "> </span>cfg.parameter
              = 'stat';</div>
            <div apple-content-edited="true"><span
                class="Apple-tab-span" style="white-space: pre; "> </span>cfg.zlim
                = [-3 2];</div>
            <div apple-content-edited="true"><span
                class="Apple-tab-span" style="white-space: pre; "> </span>cfg.layout
              = '4D148.lay';</div>
            <div apple-content-edited="true"><span
                class="Apple-tab-span" style="white-space: pre; "> </span>ft_clusterplot(cfg,
              stat);</div>
          </div>
        </div>
      </div>
      <div><br>
      </div>
      <div><br>
        <div apple-content-edited="true"><br>
        </div>
      </div>
      <br>
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      <br>
      <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>
    <br>
    <pre class="moz-signature" cols="72">-- 
Jörn M. Horschig
PhD Student
Donders Institute for Brain, Cognition and Behaviour 
Centre for Cognitive Neuroimaging
Radboud University Nijmegen 
Neuronal Oscillations Group
FieldTrip Development Team

P.O. Box 9101
NL-6500 HB Nijmegen
The Netherlands

Contact:
E-Mail: <a class="moz-txt-link-abbreviated" href="mailto:jm.horschig@donders.ru.nl">jm.horschig@donders.ru.nl</a>
Tel:    +31-(0)24-36-68493
Web: <a class="moz-txt-link-freetext" href="http://www.ru.nl/donders">http://www.ru.nl/donders</a>

Visiting address:
Trigon, room 2.30
Kapittelweg 29
NL-6525 EN Nijmegen
The Netherlands</pre>
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