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Bug 851 - freqstatistics has a problem with singular dimensions in freq field?
| Status | CLOSED WONTFIX |
| Reported | 2011-07-29 11:50:00 +0200 |
| Modified | 2013-10-26 18:15:56 +0200 |
| Product: | FieldTrip |
| Component: | core |
| Version: | unspecified |
| Hardware: | PC |
| Operating System: | Windows |
| Importance: | P1 normal |
| Assigned to: | Jan-Mathijs Schoffelen |
| URL: | |
| Tags: | |
| Depends on: | |
| Blocks: | 1021 |
| See also: |
Stephen Whitmarsh - 2011-07-29 11:50:28 +0200
Created attachment 110 mn workspace % create the 'dat' matrix here dat = data.(cfg.parameter); siz = size(dat); dimtok = tokenize(data.dimord, '_'); rptdim = find(ismember(dimtok, {'rpt' 'subj'})); permutevec = [setdiff(1:numel(siz), rptdim) rptdim]; % permutation vector to put the repetition dimension as last dimension reshapevec = [prod(siz(permutevec(1:end-1))) siz(rptdim)]; % reshape vector to reshape into 2D dat = reshape(permute(dat, permutevec), reshapevec);% actually reshape the data reduceddim = setdiff(1:numel(siz), rptdim); cfg.dim = [siz(reduceddim) 1]; % store dimensions of the output of the statistics function in the cfg cfg.dimord = ''; for k = 1:numel(reduceddim) cfg.dimord = [cfg.dimord, '_', dimtok{reduceddim(k)}]; end cfg.dimord = cfg.dimord(2:end); % store the dimord of the output in the cfg if size(cfg.design,2)~=size(dat,2) error('the number of observations in the design does not match the number of observations in the data'); end ??? Error using ==> reshape Size vector must have at least two elements. Error in ==> ft_freqstatistics at 246 dat = reshape(permute(dat, permutevec), reshapevec);% actually reshape the data
Jan-Mathijs Schoffelen - 2011-07-29 12:26:27 +0200
ft_selectdata is not robust agains small numeric inaccuracies in the .time or .freq field, leading to incorrect concatenation. Suggestion: use ft_appendfreq and implement it such that tolerance agains inaccuracies is ensured. also remove the functionality of appending from selectdata also use explicit key-value pairs in ft_appendfreq to specify the dimension over which concatenation is required.
Jan-Mathijs Schoffelen - 2011-09-22 20:02:01 +0200
*** Bug 846 has been marked as a duplicate of this bug. ***
Jan-Mathijs Schoffelen - 2011-11-10 14:38:57 +0100
I can reproduce the error message, but that's due to the variable 'data' being not a correct input for ft_freqstatistics. There is no repetition dimension. So this is a 'wontfix'