[FieldTrip] Cluster-based permutation test (CBPT)

José Antonio Uriguen Garaizabal jose.uriguen at deusto.es
Fri Jul 10 11:04:30 CEST 2015

Dear all

I am trying to implement a CBPT to compare data extracted from EEG
recordings of a group of patients vs control.

In short, I have 19 channels, 10 subjects of each type and 115 measurements
per channel and subject to be compared. I am trying to find significative
differences in a range of measurements (say from the 10th to the 20th) at
all/most/some channels, reason why I am trying to use the cluster-based

After somehow following the instrunctions in "
http://www.fieldtriptoolbox.org/tutorial/cluster_permutation_timelock" for
within-subjects experiments I think I have my data properly structured
according to FT needs. However, when I run the last part of the code
(ft_timelockstatistics) I get the following warning and error:

*Warning: Using 'state' to set RAND's internal state causes RAND, RANDI,
and RANDN to use legacy random number generators.  This*
*syntax will be removed in a future release.  See Updating Your Random
Number Generator Syntax to use RNG to replace the old syntax. *
*> In rng>handleLegacyStruct at 155*
*  In rng at 81*
*  In utilities\private\randomseed at 73*
*  In utilities\private\ft_preamble_randomseed at 11*
*  In ft_preamble at 48*
*  In ft_statistics_montecarlo at 110*
*  In fieldtrip-20140311\private\statistics_wrapper at 308*
*  In ft_timelockstatistics at 108*
*  In FT_permTest at 73 *
*Error using rng (line 81)*
*S must contain generator settings captured previously using S = RNG.*

*Error in randomseed (line 73)*
*      rng(s);*

*Error in ft_preamble_randomseed (line 11)*
*Error in ft_preamble (line 48)*
*  evalin('caller', ['ft_preamble_' cmd]);*

*Error in ft_statistics_montecarlo (line 110)*
*ft_preamble randomseed*

*Error in statistics_wrapper (line 308)*
*    [stat, cfg] = statmethod(cfg, dat, design);*

*Error in ft_timelockstatistics (line 108)*
*[stat, cfg] = statistics_wrapper(cfg, varargin{:});*

*Error in FT_permTest (line 73)*
*[stat] = ft_timelockstatistics(cfg, subjN{:}, subjE{:}); *

Anyone knows why?

Thanks in advance

Jose Antonio Urigüen

PostDoc at Deustotech-LIFE (eVIDA Research Group)

University of Deusto
Facultad de Ingeniería, 4ª Planta
Avda/Universidades 24. 48007 Bilbao. Spain
Mov.- +34 656 711 643 <%2B34%20619%2096%2072%2023>
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