Following code raises error
File "model.pxi", line 2469, in gurobipy.Model.addConstr (../../src/python/gurobipy.c:77443) TypeError: unsupported operand type(s) for -: 'bool' and 'NoneType'
on marked line
def get_incenter_and_radius(facets):
n = len(facets[0])
m = Model()
m.setParam('OutputFlag', False)
r = m.addVar(lb = -100.0, ub = 100.0, vtype = GRB.CONTINUOUS)
center = [m.addVar(lb = -1.0, ub = 1.0, vtype = GRB.CONTINUOUS, name = "x" + str(i)) for i in range(n)]
m.update()
for facet in facets:
norm = sqrt(sum(facet[i]**2 for i in nums(facet)))
m.addConstr(r * norm <= get_sp(facet, center))
m.addConstr(r > 0) # ________________ ERROR ___________________
for coord_num in range(n):
m.addConstr(center[coord_num] + r <= 1)
for coord_num in range(n):
m.addConstr(center[coord_num] - r >= -1)
m.setObjective(r, GRB.MAXIMIZE)
m.optimize()
if m.sol_count == 0:
return None, None
center_val = tuple(elt.X for elt in center)
return center_val, r.X
I have specified type and bounds for r, so what is the source of error?
Linear programming does not allow strict inequalities (>, <). You should use >= or <= operators.