%three strings example
%All in consistent units of N,m

rA = [ 1 1 0];
rB = [ 4 0 4];
rC = [ 0 4 4];
rD = [ 0 0 4];
F = 120*10;
W = [0 0 F]';

rAB = rB - rA;
rAC = rC - rA;
rAD = rD - rA;

lambdaAB = rAB'/norm(rAB);
lambdaAC = rAC'/norm(rAC);
lambdaAD = rAD'/norm(rAD);

A=[lambdaAB lambdaAC lambdaAD]

T = A\W %  !!!!!!!!!!!

A*T