[Eeglablist] bipolar to monopolar scalp derivations

[Dott. Stefania Costa Neurofisiologia]

dear arno and scott,

I have some datasets with bipolar scalp channels (e.g. Fp1-F7 or P3-O1). 
I'm trying a solution to convert this format in one that EEGLab can 
read, so that it's possible to compute time/freq scalp maps.
I've seen that a function improved to do this already exists:

http://sccn.ucsd.edu/pipermail/eeglablist/2006/001645.html

can you tell me more about its usage?

I tried to write a function of this format:

[newdata chlab] = daisy2ref2( EEG.data, 'ref', 'common','chanlocs', 
'Standard-10-20-Cap19.locs', 'badchan', 1:18);

but it doesn't seem to work, maybe because i don't know what good/bad 
electrodes are (this warning message appears: Subscripted assignment 
dimension mismatch. Error in ==> daisy2ref2 at 91    tmpdata(goodelec,:) 
= data;).

can you help me?

thanks.
Stefania Costa PhD Student, Sapienza, Rome, Italy