One investigates the solution set of Sv(x)=0, where S represents a matrix and v(x) represents the flux vector, v(x)>=0 .So the set of all possible solutions defines a convex polyhedral cone.
s=[[-1,1,0,0,0,0,0,0,0,0,0,1],[-1,1,1,-1,1,1,0,0,0,0,0,0],[1,-1,-1,0,0,0,0,0,0,0,0,0],[0,0,1,-1,1,0,0,0,1,-1 ...
