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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>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
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</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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