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MAT #MINDIFF(C,A,B)
computes minimal difference C of m x n matrices of
A=[A1,A2,...,An] and
B=[B1,B2,...,Bn]
by selecting constants s1,s2,..,sn (each either 1 or -1)
so that the sum of squares of the elements of
C=[A1-s1*B1,A2-s1*B2,...,An-sn*Bn]
is as small as possible.

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