cfg.channel needed?

[Tom Holroyd]

Hi; just exploring some of the recent changes, I noticed that if you let
cfg.channel default in preprocessing, you'll get all the channels, MEG + junk,
as expected.  But then if I'm doing cross-power and specify channel
combinations of all MEG by all MEG, strange things happen.  I get an error
saying "The cross-spectral-density matrix is not complete" from
prepare_freq_matrices().  This is because there are more channels in
cfg.channel than in the csd matrix.  I was thinking it might be nice for it to
default to only the channels specified in the csd, but it looks like there's
too much going on previously, and it's better to use cfg.channel in
preprocessing.  But the error message could be nicer.

If you leave the call to channelcombination() out, that is, omit
     cfg.channelcmb = channelcombination({'MEG' 'MEG'}, data.label);
from freqanalysis(), does it default to 'all' by 'all' so that if you said
     cfg.channel = { 'MEG' };
to preprocessing() you'll get 'MEG' by 'MEG'?

Basically I just want to ask if cfg.channel is now more-or-less required to
preprocessing()?

Thanks

Dr. Tom Holroyd
The 9th Amendment of the U.S. Constitution:
"The enumeration in the Constitution, of certain rights, shall not be
construed to deny or disparage others retained by the people."