#searev_sys.print_summary()
### Create the DP solver:
dpsolv = DPSolver(searev_sys)
# discretize the state space
N_E = 31
N_S = 61
N_A = 61
S_min, S_max = -4 * .254, 4 * 0.254
A_min, A_max = -4 * .227, 4 * .227
x_grid = dpsolv.discretize_state(0, E_rated, N_E, S_min, S_max, N_S, A_min,
A_max, N_A)
E_grid, S_grid, A_grid = x_grid
# discretize the perturbation
N_w = 9
dpsolv.discretize_perturb(-3 * innov_std, 3 * innov_std, N_w)
# control discretization step:
dpsolv.control_steps = (.001, )
dpsolv.print_summary()
# An heuristic control law:
def P_sto_law_lin(E_sto, Speed, Accel):
'''linear storage control law'''
P_prod = searev_power(Speed)
P_grid = P_rated * E_sto / E_rated
return P_prod - P_grid
###############################################################################
#invsys.print_summary()
print('Invertory Control with (h={:.1f}, p={:.1f}, c={:.1f})'.format(h, p, c))
### DP Solver ##################################################################
from stodynprog import DPSolver
dpsolv = DPSolver(invsys)
# discretize the state space
xmin, xmax = (-3, 6)
N_x = xmax - xmin + 1 # number of states
dpsolv.discretize_state(xmin, xmax, N_x)
# discretize the perturbation
N_w = len(demand_values)
dpsolv.discretize_perturb(demand_values[0], demand_values[-1], N_w)
# control discretization step:
dpsolv.control_steps = (1, ) #
#dpsolv.print_summary()
### Value iteration
J_0 = np.zeros(N_x)
# first iteration
J, u = dpsolv.value_iteration(J_0)
print(u[..., 0])
# A few more iterations
J, u = dpsolv.value_iteration(J)
print(u[..., 0])
J, u = dpsolv.value_iteration(J)
print(u[..., 0])
def optimize(crtReachMovementTask):
minimum_movement_length = crtReachMovementTask.minimum_movement_length
maximum_movement_length = crtReachMovementTask.maximum_movement_length
c = crtReachMovementTask.c
target_position = crtReachMovementTask.target_position
number_of_iterations = crtReachMovementTask.number_of_iterations
#functions defined here inside the optimizer
def dyn_inv(x, u, w):
'dynamical equation of the inventory stock `x`. Returns x(k+1).'
return (x + u + w, )
def op_cost(x, u, w):
'energy cost'
cost = abs(target_position - x) + c * u
#cost = abs(20-x)+c*u
# print(cost)
return cost
def admissible_movements(x):
'interval of allowed orders movements(x_k)'
U1 = (minimum_movement_length, maximum_movement_length)
return (U1, ) # tuple, to support several controls
# Attach it to the system description.
# Attach the dynamical equation to the system description:
movement_sys.dyn = dyn_inv
mov_values = [-6, -4, -2, 0, 2, 4, 6]
mov_proba = [0.1, 0.1, 0.15, 0.3, 0.15, 0.1, 0.1]
demand_law = stats.rv_discrete(values=(mov_values, mov_proba))
demand_law = demand_law.freeze()
demand_law.pmf([0, 3]) # Probality Mass Function
demand_law.rvs(10) # Random Variables generation
movement_sys.perturb_laws = [demand_law
] # a list, to support several perturbations
movement_sys.control_box = admissible_movements
movement_sys.cost = op_cost
print('Movement Control with (c={:.1f})'.format(c))
dpsolv = DPSolver(movement_sys)
# discretize the state space
xmin, xmax = (0, 100)
N_x = xmax - xmin + 1 # number of states
dpsolv.discretize_state(xmin, xmax, N_x)
# discretize the perturbation
N_w = len(mov_values)
dpsolv.discretize_perturb(mov_values[0], mov_values[-1], N_w)
# control discretization step:
dpsolv.control_steps = (1, ) #
#dpsolv.print_summary()
### Value iteration
J_0 = np.zeros(N_x)
# first iteration
J, u = dpsolv.value_iteration(J_0)
print(u[..., 0])
for i in xrange(number_of_iterations):
J, u = dpsolv.value_iteration(J)
# print(u[...,0])
return [movement_sys, dpsolv, u]
#invsys.print_summary()
print('Invertory Control with (h={:.1f}, p={:.1f}, c={:.1f})'.format(h,p,c))
### DP Solver ##################################################################
from stodynprog import DPSolver
dpsolv = DPSolver(invsys)
# discretize the state space
xmin, xmax = (-3,6)
N_x = xmax-xmin+1 # number of states
dpsolv.discretize_state(xmin, xmax, N_x)
# discretize the perturbation
N_w = len(demand_values)
dpsolv.discretize_perturb(demand_values[0], demand_values[-1], N_w)
# control discretization step:
dpsolv.control_steps=(1,) #
#dpsolv.print_summary()
### Value iteration
J_0 = np.zeros(N_x)
# first iteration
J,u = dpsolv.value_iteration(J_0)
print(u[...,0])
# A few more iterations
J,u = dpsolv.value_iteration(J)
print(u[...,0])
J,u = dpsolv.value_iteration(J)
print(u[...,0])
# searev_sys.print_summary()
### Create the DP solver:
dpsolv = DPSolver(searev_sys)
# discretize the state space
N_E = 31
N_S = 61
N_A = 61
S_min, S_max = -4 * 0.254, 4 * 0.254
A_min, A_max = -4 * 0.227, 4 * 0.227
x_grid = dpsolv.discretize_state(0, E_rated, N_E, S_min, S_max, N_S, A_min, A_max, N_A)
E_grid, S_grid, A_grid = x_grid
# discretize the perturbation
N_w = 9
dpsolv.discretize_perturb(-3 * innov_std, 3 * innov_std, N_w)
# control discretization step:
dpsolv.control_steps = (0.001,)
dpsolv.print_summary()
# An heuristic control law:
def P_sto_law_lin(E_sto, Speed, Accel):
"""linear storage control law"""
P_prod = searev_power(Speed)
P_grid = P_rated * E_sto / E_rated
return P_prod - P_grid
###############################################################################