


simtb_padSM() - Pads SM dimensions to accomodate head translation
Usage:
>> SMnew = simtb_padSM(SM, Npad)
INPUTS:
SM = Spatial Maps, size [nC x nV*nV]
Npad = Number of elements to add, should be EVEN.
OUTPUTS:
SMnew = padded spatial maps, size [nC x (nV+Npad)*(nV+Npad)]
see also: simtb_addMotion(), simtb_makeMotParams()