% example of Least Square solution to find a resistance
B=[1.83810880488929,1.99127982643865,0.309399042734593,1.97361551736856,1.38336646995853,0.256162443517608]
A=[0.814723686393179,0.905791937075619,0.126986816293506,0.913375856139019,0.632359246225410,0.0975404049994095]
R=inv(A'*A)*A'*B
A=A'; B=B';
R=inv(A'*A)*A'*B

%Showing the accuracy of the solution
B2=R.*A
plot(A,B,'o')
hold on; plot(A,B2,'-r')

%example of least norm
A=[1,2,3;5,0,4]; B=[2.2;1.0];
X=A'*inv(A*A')*B
A*X-B