[FieldTrip] Error using ft_clusterplot (line 153)

[Bruno Mansur]

Dear fieldtrip list members,

I'm trying to perform a *cluster based permutation test* on *time-frequency*
data obtained from 'FT_FREQANALYSIS'.

I execute the following command for it:

% 2. Permutation test

cfg = [];
cfg.channel           = {'EEG'};
cfg.latency            = [0 1.8];
cfg.frequency        = 'all';% all frequencies from 2 to 48
cfg.method            = 'montecarlo';
cfg.statistic            = 'ft_statfun_depsamplesT';
cfg.correctm          = 'cluster';
cfg.clusteralpha     = 0.05;
cfg.clusterstatistic  = 'maxsum';
cfg.minnbchan       = 2;
cfg.tail                    = 0;
cfg.clustertail         = 0;
cfg.alpha                = 0.05;
cfg.numrandomization = 500;

% 3. Find the channel neighbours for spatial clustering

cfg_neighb.method    = 'distance';
cfg.neighbours       = ft_prepare_neighbours(cfg_neighb, Tfr_Ogt_ogt{1,1});

ft_neighbourplot(cfg_neighb, Tfr_Ogt_ogt{1:1})% to check neighbours

%------------------------

% 4. Setting the design for the cluster permutation test

Nsubj  = 33;
design = zeros(2, Nsubj*2);
design(1,:) = [1:Nsubj 1:Nsubj];
design(2,:) = [ones(1,Nsubj) ones(1,Nsubj)*2];

cfg.design = design;
cfg.uvar   = 1;
cfg.ivar   = 2;

[stat] = ft_freqstatistics(cfg, Tfr_Ogt_ogt{:}, Tfr_Ogt_low{:});

% ------------------------------------------------------------------------

Until here I get no error messages and the 'stat' variable seems to have
been created (I got 14 negative clusters). Though *when I try plotting it,
I get the following error message*;

Input:
% 5. Plot with ft_clusterplot:

cfg = [];
cfg.alpha  = 0.05;
cfg.parameter = 'stat';
cfg.zlim   = 'maxmin';
cfg.layout = 'acticap-64ch-standard2.mat';
ft_clusterplot(cfg, stat);

Output:

>> cfg = [];
cfg.alpha  = 0.05;
cfg.parameter = 'stat';
cfg.zlim   = 'maxmin';
cfg.layout = 'acticap-64ch-standard2.mat';
ft_clusterplot(cfg, stat);
the input is freq data with 64 channels, 48 frequencybins and 37 timebins
reading layout from file acticap-64ch-standard2.mat
the call to "ft_prepare_layout" took 0 seconds and required the additional
allocation of an estimated 0 MB

*Error using ft_clusterplot (line 153)if you input time-frequency data this
only works if either frequency or time is a singleton dimension*

Does anyone know what I can do to plot my data correctly? I would really
appreciate any inputs.

Best,

-- 
*Bruno*
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