DEL2MAP	Compute the discrete laplacian of an EEG distribution.
Usage:	>> [ laplac ] = del2map( map, filename, draw );
Inputs:
map	level of activity (size: nbelectrodes * nbChannel)
filename	filename (.loc file) countaining the coordinates of the electrodes, or array countaining complex positions
draw	integer, if not nul draw the gradient (default:0)
Output:
laplac	laplacian map

See the matlab file del2map.m (may require other functions)

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