Function rhs

examples/network_flow.py:22–23

(n)

#   sum(out) - sum(in) = { -1  if n = dest
#                        {  0     otherwise
def rhs(n):
    return 1 if n == orig else -1 if n == dest else 0

def flow(E):
    return h.qsum((x[e] for e in E))