def getModel():
N = 10**5
model = madopt.IpoptModel(show_solver=True)
x = dict()
for i in range(N):
x[i] = model.addVar(lb=-1.5, ub=0, init=-0.5, name="x"+str(i))
obj = madopt.Expr(0)
for i in range(N):
obj += (x[N-i-1] - 1)**2
model.setObj(obj)
for i in range(N-2):
a = float(i+2)/float(N)
model.addConstr((x[i+1]**2 + 1.5*x[i+1] - a)*madopt.cos(x[i+2]) - x[i], lb=0, ub=0)
return model
def getModel():
N = 10**5
model = madopt.IpoptModel(show_solver=True)
x = dict()
for i in range(N):
x[i] = model.addVar(lb=-1.5, ub=0, init=-0.5, name="x" + str(i))
obj = madopt.Expr(0)
for i in range(N):
obj += (x[N - i - 1] - 1)**2
model.setObj(obj)
for i in range(N - 2):
a = float(i + 2) / float(N)
model.addConstr(
(x[i + 1]**2 + 1.5 * x[i + 1] - a) * madopt.cos(x[i + 2]) - x[i],
lb=0,
ub=0)
return model
x = dict()
for i in range(N):
x[i] = model.addVar(lb=-1.5, ub=0, init=-0.5, name="x"+str(i))
a = madopt.ln(x[0])
a = madopt.log2(x[0])
obj = madopt.Expr(0)
for i in range(N):
obj += (x[N-i-1] - 1)**2
model.setObj(obj)
for i in range(N-2):
a = float(i+2)/float(N)
model.addConstr((x[i+1]**2 + 1.5*x[i+1] - a)*madopt.cos(x[i+2]) - x[i], lb=0, ub=0)
model.solve()
if model.has_solution:
print(model.nx, model.ng, model.objValue, model.stat)
var = x[0]
if model.has_solution:
# var.x ==> solution value
print(var.lb, var.ub, var.init, var.x)
# change bounds
var.lb = -1
var.ub = 12
x = dict()
for i in range(N):
x[i] = model.addVar(lb=-1.5, ub=0, init=-0.5, name="x" + str(i))
a = madopt.ln(x[0])
a = madopt.log2(x[0])
obj = madopt.Expr(0)
for i in range(N):
obj += (x[N - i - 1] - 1)**2
model.setObj(obj)
for i in range(N - 2):
a = float(i + 2) / float(N)
model.addConstr(
(x[i + 1]**2 + 1.5 * x[i + 1] - a) * madopt.cos(x[i + 2]) - x[i],
lb=0,
ub=0)
model.solve()
if model.has_solution:
print(model.nx, model.ng, model.objValue, model.stat)
var = x[0]
if model.has_solution:
# var.x ==> solution value
print(var.lb, var.ub, var.init, var.x)
# change bounds
var.lb = -1