[FieldTrip] How to interpret content of partial PLV-spectrum when dimensionality is inconsistent with dimord?

[Schoffelen, J.M. (Jan Mathijs)]

Hi Katarina,

Good question. Could be a bug. Could you file this on bugzilla.fieldtriptoolbox.org, and upload the necessary data so that we can try and reproduce it?

Thanks and best,

Jan-Mathijs

On Jan 5, 2016, at 1:14 AM, Katarina Slama <slama at berkeley.edu> wrote:

> Dear Fieldtrip community,
> 
> Happy new year!
> 
> I have a question about computing partial PLV-values using ft_connectivityanalysis: 
> 
> When I try to compute PLV-values, and request that one channel be partialized, the resulting PLV-spectrum has the dimensionality 27 x 27 x 28 x 3, while dimord reports it to be: chan_chan_freq. Why this inconsistency, and how should I interpret the contents of this PLV-spectrum?
> 
> I provide information about my input and output structures below. 
> 
> —
> input structure (freq):
> label: {'34'  '35'  '36'  '37'  '38'  '39'  '44'  '45'  '47'  '48'  '49'  '50'  '51'  '52'  '53'  '54'  '55'  '56'  '57'  '62'  '63'  '64'  '76'  '77'  '80'  '99' '100'  '101'}
> dimord: 'rpttap_chan_freq'
> freq: [2.0000 3.0000 4.0000]
> fourierspctrm: [220x28x3 double]
> cumsumcnt: [220x1 double]
> cumtapcnt: [220x1 double]
> trialinfo: [220x1 double]
> cfg: [1x1 struct]
> 
> configuration structure (cfg):
> method: 'plv'
> partchannel: {'34'}
> 
> plv_struct = ft_connectivityanalysis(cfg,freq);
> 
> output structure (plv_struct):
> label: {27x1 cell}
> dimord: 'chan_chan_freq'
> plvspctrm: [4-D double]
> freq: [2.0000 3.0000 4.0000]
> dof: 220
> cfg: [1x1 struct]
> —
> 
> Thank you very much for your help!
> 
> Best,
> Kata
> _______________________________________________
> fieldtrip mailing list
> fieldtrip at donders.ru.nl
> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip