function y = GrayCoding(x,Nbits);% y = GrayCoding(x,Nbits);%% reverses the systematic Gray code of the Nbit number x.% S Weiss, 10/10/2000% x in [0; 2^Nbits-1]y = 0;dummy = 0;for i = Nbits:-1:1,    A = floor(x/2^(i-1));    if (A==1)    		% i-th bit is set	x = x - 2^(i-1);    end;    if (A~=dummy),       y = y+2^(i-1);       dummy = 1;    else       dummy = 0;	    end;end;