[Eeglablist] EEG data rank

Cedric Cannard ccannard at protonmail.com
Wed Mar 3 18:27:15 PST 2021

Hi everyone,

I was trying to assess data rank after importing some Biosemi and Neuroscan data, trying different importing methods, as well as re-referencing methods (average and REST) to see their impacts on rank, but get weird numbers (e.g. rank 1, 9, 21 with 64 channels data). I have been using rank(EEG.data) in Matlab 2020b.
I have tried importing data with pop_biosig and pop_readbdf, with Cz as reference or no reference (same results), and pop_loadcnt for neuroscan .cnt data.
I am also seeing rank changes after downsampling, filtering, interpolating channels, etc.
Is this not the right way to assess rank?


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