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<body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">Dear recipient,<br><br>I am out of the office until January 7th, 2025 and will not see your email until I return.<br><br>Kind regards,<br>Gregor Volberg<br><br><div>-- <br>Prof. Dr. rer. nat. Gregor Volberg<br>Adjunct Professor</div><div>Cognitive Neuroscience</div><div>Universität Regensburg<br>93040 Regensburg, Deutschland</div><div><br></div><div>Tel: +49 941 943 3862<br>Fax: +49 941 943 3233</div><div>Room PT 4.0.36<br><a href="https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Forcid.org%2F0000-0002-4427-2409&data=05%7C02%7Cfieldtrip%40science.ru.nl%7C424c0d0e9e584b03ac2c08dd212ce870%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C638703198948385573%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C40000%7C%7C%7C&sdata=rqaTpFfuTJ033vSq0L2f3Tr84zc2huYnRmQVeTSvgZQ%3D&reserved=0" originalSrc="https://orcid.org/0000-0002-4427-2409" shash="C2B8jT05iCQFJkCStLnaYPVybfwFA99mIguoymNaLVH8H5yxOS4NU+zQAdKiouzZtbKmTzt4whmGkMfQKHVzPPEmlYyF2wZy62rm3oStglojX6sDY9nF+uuHW+ysQvps1t6Me9W2fsPNIWDDjqb2pGD9TLIoMuLyr7tCMiMRTkc=">https://orcid.org/0000-0002-4427-2409</a><br><br></div><br><br>>>> "Schoffelen,J.M. (Jan Mathijs) via fieldtrip" <fieldtrip@science.ru.nl> 20.12.24 19:46 >>><br><br>
Hi Anne,
<div><br>
</div>
<div>It seems as if you have solved it yourself indeed. I did not notice that the data structure that you pasted in an earlier e-mail indeed was fieldtrip-incompatible, with an incorrect ‘dimord’. I don’t know where this data structure came from, but if it
was created using ‘purely’ fieldtrip functions, please do point us to where in the code this happened. Otherwise, I will file this as a ‘user error’, thanks for letting us know, and glad that it now works for you.</div>
<div><br>
</div>
<div>Best wishes,</div>
<div>Jan-Mathijs<br id="lineBreakAtBeginningOfMessage">
<div><br>
<blockquote type="cite">
<div>On 19 Dec 2024, at 16:53, Anne Guérin via fieldtrip <fieldtrip@science.ru.nl> wrote:</div>
<br class="Apple-interchange-newline">
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<br class="Apple-interchange-newline">
Le 19/12/2024 à 14:57, Schoffelen, J.M. (Jan Mathijs) via fieldtrip a écrit :<br>
</div>
<blockquote type="cite" cite="mid:FB284698-802A-4564-B6AA-9F6F9F463336@donders.ru.nl" style="font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">
Hi Anne,
<div><br>
</div>
<div>I don’t know what’s going on. </div>
<div><br>
</div>
<div>Have you tried cfg.neighbours = {} (i.e. curly rather than square brackets), and/or explicitly defined cfg.connectivity = []; ?</div>
<div><br>
</div>
<div>Best wishes,</div>
<div>Jan-Mathijs</div>
<div><br id="lineBreakAtBeginningOfMessage">
<div>Hi Jan-Mathijs,<span class="Apple-converted-space"> </span><br>
</div>
</div>
</blockquote>
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When I try cfg.neighbours = {}, instead of [], a bug appears earlier at<span class="Apple-converted-space"> </span><br>
</p>
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Unrecognized field name "label".<br>
<br>
Error in channelconnectivity (line 91)<br>
[seld] = match_str(chans, neighbours(chan).label);</p>
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I solved it with cfg.chanel = {ROI} in order to overlap the field .label of the data structure, and with cfg.neighbours = [];<br>
</p>
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after this function (channelconnectivity) and go back to<span class="Apple-converted-space"> </span><br>
</p>
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I have for the cfg structure and these 3 fields :<span class="Apple-converted-space"> </span><br>
</p>
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channel: {'V5_R'}<br>
neighbours: []<br>
connectivity: 0</p>
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With cfg.neighbours={}; , in the function channelconnectivity, the bug appears at line 91<br>
</p>
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line 90 for chan=1:length(neighbours)<br>
line 91 [seld] = match_str(chans, neighbours(chan).label);<br>
</p>
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in fact with cfg.neighbours={} , the variable 'neighbours' is a struct with no field, so length(neighbours)=1 , and the loop begins and it's bug.</p>
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So I go back cfg.chanel = {'V5_R'} and cfg.neighbours=[] (cfg.connectivity = [] has<span class="Apple-converted-space"> </span>no impact), I find the same bug again, at the function <span class="Apple-converted-space"> </span><font size="2">'findcluster'.<span class="Apple-converted-space"> </span><br>
</font></p>
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<font size="2">But, I think that the problem comes from the expected input data onoff of the function findcluster :<span class="Apple-converted-space"> </span></font></p>
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<font size="2">onoff = is a 3D boolean matrix with size N1xN2xN3</font></p>
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<font size="2">three dimensions are expected for chan freq and time, but in my case there are only two dimensions freq and time. So I changed the indut data like this (for example for the first subject) :</font></p>
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<font size="2">ftAllFiles{1}<br>
<br>
ans =<span class="Apple-converted-space"> </span><br>
<br>
struct with fields:<br>
<br>
dimord: 'chan_freq_time'<br>
avg: [1×29×401 double]<br>
time: [-0.2000 -0.1990 -0.1980 -0.1970 -0.1960 -0.1950 -0.1940 -0.1930 -0.1920 -0.1910 -0.1900 -0.1890 -0.1880 -0.1870 -0.1860 … ]<br>
freq: [6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34]<br>
label: {'V5_R'}<span class="Apple-converted-space"> </span><br>
</font></p>
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<font size="2">with a first dimension as a scalar (only one chanel).<span class="Apple-converted-space"> </span><br>
</font></p>
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<font size="2">It now seems to be working properly. but I must verify the results to be sure.<br>
</font></p>
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<font size="2">The moral of the story is that you always have to define a “chan” dimension, even if there's only one chanel, and that it's not theoretically necessary to encode the data in this case. </font></p>
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<font size="2">Thank you. </font></p>
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<font size="2">Best regards. </font></p>
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<font size="2">Anne<span class="Apple-converted-space"> </span><br>
</font></p>
<blockquote type="cite" cite="mid:FB284698-802A-4564-B6AA-9F6F9F463336@donders.ru.nl" style="font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">
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<blockquote type="cite">
<div>On 19 Dec 2024, at 12:18, Anne Guérin via fieldtrip<span class="Apple-converted-space"> </span><a class="moz-txt-link-rfc2396E" href="mailto:fieldtrip@science.ru.nl"><fieldtrip@science.ru.nl></a><span class="Apple-converted-space"> </span>wrote:</div>
<br class="Apple-interchange-newline">
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<font size="2">Hi,<span class="Apple-converted-space"> </span><br>
</font></p>
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<font size="2">I would like to use the FT permutations test with cluster based correction on 2D data freq x time with a within subject design. Data are obtained after sources reconstruction and are for example related to a particular ROI (e.g. V5_R). The first
dimension is a frequency dimension but not the oscillatory brain frequency. This dimension is linked to a temporal frequency of the input visual stimulus. the second dimension is time (sRate = 1kHz) and data are timelocked ERP for different values of this
temporale frequency (by step of 1Hz). The data therefore has the same structure as if it had been obtained by time-frequency analysis on a particular electrode.<span class="Apple-converted-space"> </span><br>
</font></p>
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<font size="2">For example, here's the data for one participant:<br>
ftAllFiles{1}<br>
<br>
ans =<span class="Apple-converted-space"> </span><br>
<br>
struct with fields:<br>
<br>
dimord: 'freq_time'<br>
avg: [29×401 double]<br>
time: [-0.2000 -0.1990 -0.1980 -0.1970 -0.1960 -0.1950 -0.1940 -0.1930 -0.1920 -0.1910 -0.1900 -0.1890 -0.1880 -0.1870 -0.1860 … ]<br>
freq: [6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34]<br>
label: {'V5_R'}<br>
There are 29 participants for each conditions. ftAllFiles have 2x29 cells, the first 29 correspond to the first condition and the last 29 to the second condition.<span class="Apple-converted-space"> </span><br>
</font></p>
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<font size="2">Here is the configuration :<span class="Apple-converted-space"> </span><br>
</font></p>
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<font size="2">>> statcfg<br>
<br>
statcfg =<span class="Apple-converted-space"> </span><br>
<br>
struct with fields:<br>
<br>
frequency: 'all'<br>
parameter: 'avg'<br>
avgoverfreq: 'no'<br>
avgoverchan: 'no'<br>
latency: 'all'<br>
method: 'montecarlo'<br>
statistic: 'ft_statfun_depsamplesT'<br>
correctm: 'cluster'<br>
clusteralpha: 0.0500<br>
clusterstatistic: 'maxsum'<br>
minnbchan: 0<br>
tail: 1<br>
clustertail: 1<br>
alpha: 0.0500<br>
numrandomization: 100000<br>
ivar: 1<br>
uvar: 2<br>
design: [2×58 double]<br>
channel: 'all'<br>
neighbours: []<br>
avgovertime: 'no'</font></p>
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<font size="2">When I run ftStat = ft_freqstatistics(statcfg, ftAllFiles{:}); , the program stops at the step 'findcluster':</font></p>
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<font size="2">posclusobs = findcluster(tmp, connmat, cfg.minnbchan);</font></p>
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<font size="2">In fact tmp is 2D boolean table (29 frequency samples x 401 time samples), connmat is 4x4 matrix with 0 and <span class="Apple-converted-space"> </span></font><font size="2">cfg.minnbchan=0. So bug with<span class="Apple-converted-space"> </span></font><font size="2">findcluster.
See below.<span class="Apple-converted-space"> </span><br>
</font></p>
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<font size="2">When I plot tmp (image(tmp)), the result doesn't look ridiculous.<span class="Apple-converted-space"> </span><br>
<br>
</font></p>
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<font size="2">How to have a good configuration of neighborhood for this single-sensor time-frequency permutation test ? </font></p>
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<font size="2">Thank you for your help. </font></p>
<p style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; 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;">
<font size="2">Best regards. </font></p>
<p style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; 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;">
<font size="2">Anne</font></p>
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<font size="2">ps : <span class="Apple-converted-space"> </span><br>
</font></p>
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<font size="2">>> ftStat = ft_freqstatistics(statcfg, ftAllFiles{:});<br>
the call to "ft_selectdata" took 0 seconds<br>
using "ft_statistics_montecarlo" for the statistical testing<br>
using "ft_statfun_depsamplesT" for the single-sample statistics<br>
constructing randomized design<br>
total number of measurements = 58<br>
total number of variables = 2<br>
number of independent variables = 1<br>
number of unit variables = 1<br>
number of within-cell variables = 0<br>
number of control variables = 0<br>
using a permutation resampling approach<br>
repeated measurement in variable 2 over 29 levels<br>
number of repeated measurements in each level is 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2<span class="Apple-converted-space"> </span><br>
the maximum number of unique permutations is 536870912<br>
generated 100000 random permutations<br>
computing a parametric threshold for clustering<br>
computing statistic<br>
estimated time per randomization is 0.00 seconds<br>
computing statistic 100000 from 100000<br>
<br>
Error using findcluster<br>
invalid dimension of spatdimneighbstructmat<br>
<br>
Error in clusterstat (line 214)<br>
posclusobs = findcluster(tmp, connmat, cfg.minnbchan);<br>
<br>
Error in ft_statistics_montecarlo (line 364)<br>
[stat, cfg] = clusterstat(cfg, statrand, statobs);<br>
<br>
Error in ft_freqstatistics (line 194)<br>
[stat, cfg] = statmethod(cfg, dat, design);<br>
</font></p>
<p style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; 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;">
<font size="2"> <br>
</font></p>
<p style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; 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;">
<font size="2"><br>
</font></p>
<pre class="moz-signature" cols="72" style="caret-color: rgb(0, 0, 0); font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">--
Anne Guérin-Dugué
PR Emérite Université Grenoble Alpes (UGA)
GIPSA-lab / PSD / Equipe ViBS
Bureau B146
Site Ampère
11 rue des Mathématiques
BP 46
F - 38042 GRENOBLE
tel : +33 (0)4 76 57 43 73
mel :<a href="mailto:anne.guerin@gipsa-lab.grenoble-inp.fr" moz-do-not-send="true" class="moz-txt-link-freetext">anne.guerin@gipsa-lab.grenoble-inp.fr</a></pre>
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<fieldset class="moz-mime-attachment-header"></fieldset>
<pre wrap="" class="moz-quote-pre">_______________________________________________
fieldtrip mailing list
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</pre>
</blockquote>
<pre class="moz-signature" cols="72" style="caret-color: rgb(0, 0, 0); font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">--
Anne Guérin-Dugué
PR Emérite Université Grenoble Alpes (UGA)
GIPSA-lab / PSD / Equipe ViBS
Bureau B146
Site Ampère
11 rue des Mathématiques
BP 46
F - 38042 GRENOBLE
tel : +33 (0)4 76 57 43 73
mel :<a href="mailto:anne.guerin@gipsa-lab.grenoble-inp.fr">anne.guerin@gipsa-lab.grenoble-inp.fr</a></pre>
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