def cube(k):
cglob = -1j * k
cloc = cloc0 + cloc1 * k + cloc2 * k**2
print("k: ", k, "cloc: ", cloc)
mus = {'k': k, 'c_glob': cglob, 'c_loc': cloc}
resolution = int(
np.ceil(float(k * 1.5 + 50) / coarse_grid_resolution) *
coarse_grid_resolution)
n = int(k / 5 + 30)
gq, lq = localize_problem(p,
coarse_grid_resolution,
resolution,
mus=mus)
d = gq["d"]
u = d.solve(mus)
e_r = []
e_d = []
for i in range(it):
print(i, )
sys.stdout.flush()
bases = create_bases2(gq, lq, n, transfer='robin')
ru_r = reconstruct_solution(gq, lq, bases)
del bases
dif_r = u - ru_r
e_r.append(gq["full_norm"](dif_r)[0] / gq["full_norm"](u)[0])
bases = create_bases2(gq, lq, n, transfer='dirichlet')
ru_d = reconstruct_solution(gq, lq, bases)
del bases
dif_d = u - ru_d
e_d.append(gq["full_norm"](dif_d)[0] / gq["full_norm"](u)[0])
return np.mean(e_d), np.mean(e_r)
def cube(n):
print("n: ", n)
Q0 = []
Q1 = []
Q2 = []
for j in range(it):
print(j, )
sys.stdout.flush()
basis_robin = create_bases3(gq, lq, n, 0)
ru_robin = reconstruct_solution(gq, lq, basis_robin)
del basis_robin
dif_robin = u - ru_robin
Q0.append(gq["full_norm"](dif_robin)[0] / gq["full_norm"](u)[0])
basis_robin = create_bases3(gq, lq, n, 1)
ru_robin = reconstruct_solution(gq, lq, basis_robin)
del basis_robin
dif_robin = u - ru_robin
Q1.append(gq["full_norm"](dif_robin)[0] / gq["full_norm"](u)[0])
basis_robin = create_bases3(gq, lq, n, 2)
ru_robin = reconstruct_solution(gq, lq, basis_robin)
del basis_robin
dif_robin = u - ru_robin
Q2.append(gq["full_norm"](dif_robin)[0] / gq["full_norm"](u)[0])
return [np.mean(Q0), np.mean(Q1), np.mean(Q2)]
def evaluation(it,
lim,
k,
boundary,
save,
cglob=0,
cloc=0,
plot=False,
resolution=200,
coarse_grid_resolution=10):
p = helmholtz(boundary=boundary)
mus = {'k': k, 'c_glob': cglob, 'c_loc': cloc}
gq, lq = localize_problem(p, coarse_grid_resolution, resolution, mus=mus)
d = gq["d"]
u = d.solve(mus)
h1_dirichlet = []
h1_robin = []
nrang = np.arange(0, lim, 5)
for n in nrang:
print("n: ", n)
h1d = []
h1r = []
for j in range(it):
print(j, )
sys.stdout.flush()
basis_dirichlet = create_bases2(gq, lq, n)
ru_dirichlet = reconstruct_solution(gq, lq, basis_dirichlet)
del basis_dirichlet
basis_robin = create_bases2(gq, lq, n, transfer='robin')
ru_robin = reconstruct_solution(gq, lq, basis_robin)
del basis_robin
dif_dirichlet = u - ru_dirichlet
dif_robin = u - ru_robin
h1d.append(gq["full_norm"](dif_dirichlet)[0] /
gq["full_norm"](u)[0])
h1r.append(gq["full_norm"](dif_robin)[0] / gq["full_norm"](u)[0])
h1_dirichlet.append(h1d)
h1_robin.append(h1r)
means_dirichlet_h1 = np.mean(h1_dirichlet, axis=1)
means_robin_h1 = np.mean(h1_robin, axis=1)
data = np.vstack([nrang, means_dirichlet_h1, means_robin_h1]).T
open(save, "w").writelines([" ".join(map(str, v)) + "\n" for v in data])
if plot:
from matplotlib import pyplot as plt
plt.figure()
plt.semilogy(nrang, means_dirichlet_h1, label="Dirichlet h1")
plt.semilogy(nrang, means_robin_h1, label="Robin h1")
plt.legend(loc='upper right')
plt.xlabel('Basis size')
plt.show()
def knerr2D(it,
boundary,
save,
cglob=None,
cloc0=0,
cloc1=1,
cloc2=1,
krang=np.arange(0.1, 200.1, 10.),
nrang=np.arange(0, 100, 5),
plot=False,
resolution=100,
coarse_grid_resolution=10):
err_r = np.zeros((len(krang), len(nrang)))
p = helmholtz(boundary=boundary)
usecglob = (cglob is None)
xi = 0
for k in krang:
yi = 0
if usecglob:
cglob = -1j * k
cloc = cloc0 + cloc1 * k + cloc2 * k**2
mus = {'k': k, 'c_glob': cglob, 'c_loc': cloc}
gq, lq = localize_problem(p,
coarse_grid_resolution,
resolution,
mus=mus)
d = gq["d"]
u = d.solve(mus)
for n in nrang:
print(k, n)
e_r = []
for i in range(min(20 - n / 5, it)):
print(i, )
sys.stdout.flush()
bases = create_bases2(gq, lq, n, transfer='robin')
ru_r = reconstruct_solution(gq, lq, bases)
del bases
dif_r = u - ru_r
e_r.append(gq["full_norm"](dif_r)[0] / gq["full_norm"](u)[0])
err_r[xi][yi] = np.mean(e_r)
yi += 1
xi += 1
X, Y = np.meshgrid(krang, nrang)
data = np.vstack([X.T.ravel(), Y.T.ravel(), err_r.ravel()]).T
open(save, "w").writelines([" ".join(map(str, v)) + "\n" for v in data])
if plot:
import matplotlib.pyplot as plt
from matplotlib import cm
fig = plt.figure()
ax = fig.gca(projection='3d')
surf = ax.plot_surface(X,
Y,
err_r,
cstride=1,
rstride=1,
cmap=cm.coolwarm,
linewidth=0,
antialiased=False)
fig.colorbar(surf, shrink=0.5, aspect=5)
plt.show()
def resolution(it,
k,
n,
boundary,
save,
cloc=0,
returnvals=False,
coarse_grid_resolution=10):
cglob = -1j * k
mus = {'k': k, 'c_glob': cglob, 'c_loc': cloc}
p = helmholtz(boundary=boundary)
space = np.arange(20, 160, 10)
err = []
for resolution in space:
print(resolution)
gq, lq = localize_problem(p,
coarse_grid_resolution,
resolution,
mus=mus)
d = gq["d"]
u = d.solve(mus)
E = []
for i in range(it):
bases = create_bases2(gq, lq, n, transfer='robin')
ru = reconstruct_solution(gq, lq, bases)
E.append(gq["full_norm"](u - ru)[0] / gq["full_norm"](u)[0])
err.append(E)
errs = np.mean(err, axis=1)
data = np.vstack([space, errs]).T
open(save, "w").writelines([" ".join(map(str, v)) + "\n" for v in data])
if returnvals:
return [space, errs]
def test2(transfer='robin',
boundary='dirichlet',
acc=1e-2,
k=6.,
cloc=6.,
title='test',
resolution=100,
coarse_grid_resolution=10):
cglob = -1j * k
mus = {'k': k, 'c_glob': cglob, 'c_loc': cloc}
p = helmholtz(boundary=boundary)
gq, lq = localize_problem(p,
coarse_grid_resolution,
resolution,
mus,
calQ=True)
basis = create_bases(gq,
lq,
20,
transfer=transfer,
target_accuracy=acc,
silent=False)
ru = reconstruct_solution(gq, lq, basis, silent=False)
d = gq["d"]
u = d.solve(mus)
dif = u - ru
print(gq["full_norm"](dif)[0] / gq["full_norm"](u)[0])
d.visualize((dif.real, dif.imag, u.real, u.imag, ru.real, ru.imag),
legend=('dif.real', 'dif.imag', 'u.real', 'u.imag', 'ru.real',
'ru.imag'),
separate_colorbars=True,
title=title)
def cube():
bases = create_bases2(gq, lq, n, transfer='robin')
ru_r = reconstruct_solution(gq, lq, bases)
del bases
dif_r = u - ru_r
return gq["full_norm"](dif_r)[0] / gq["full_norm"](u)[0]
def cube(k):
print(k)
cglob = -1j * k
cloc = cloc0 + cloc1 * k + cloc2 * k**2
mus = {'k': k, 'c_glob': cglob, 'c_loc': cloc}
resolution = int(
np.ceil(float(k * 1.5 + 50) / coarse_grid_resolution) *
coarse_grid_resolution)
gq, lq = localize_problem(p,
coarse_grid_resolution,
resolution,
mus=mus,
calT=True,
calQ=True)
calculate_continuity_constant(gq, lq)
calculate_inf_sup_constant2(gq, lq)
# calculate_lambda_min(gq, lq)
calculate_csis(gq, lq)
calculate_Psi_norm(gq, lq)
d = gq["d"]
u = d.solve(mus)
norm = gq["full_norm"]
localizer = gq["localizer"]
pou = gq["pou"]
dats = []
for j in range(it):
print(j, )
sys.stdout.flush()
bases = create_bases(gq,
lq,
num_testvecs=20,
transfer='robin',
target_accuracy=acc,
calC=False)
ru = reconstruct_solution(gq, lq, bases)
ls = norm(u - ru)[0] / norm(u)[0]
sum1 = u * 0
sum2 = 0
sum3 = 0
sum4 = 0
sum51 = []
sum52 = 0
for space in gq["spaces"]:
ldict = lq[space]
B = bases[space]
range_product = ldict["range_product"]
source_product = ldict["source_product"]
T = ldict["robin_transfer"].as_range_array()
range_space = ldict["range_space"]
omega_star_space = ldict["omega_star_space"]
omega_star_product = ldict["omega_star_product"]
u_s = ldict["local_solution_robin"]
u_s2 = ldict["local_sol2"]
u_loc = pou[range_space](localizer.localize_vector_array(
u, range_space))
u_loc2 = localizer.localize_vector_array(u, omega_star_space)
u_dif = u_loc - u_s
u_dif2 = u_loc2 - u_s2
term = u_dif - B.lincomb(B.inner(u_dif, range_product).T)
T1 = T - B.lincomb(B.inner(T, range_product).T)
maxval = operator_svd2(T1.data.T, source_product.matrix,
range_product.matrix)[0][0]
sum1 += localizer.globalize_vector_array(term, range_space)
sum2 += term.norm(range_product)[0]**2
sum3 += maxval**2 * ldict["Psi_norm"]**2 * u_dif2.norm(
omega_star_product)[0]**2
sum4 += maxval**2 * ldict["Psi_norm"]**2 * u_loc2.norm(
omega_star_product)[0]**2 * ldict["csi"]**2
sum51.append(maxval * ldict["Psi_norm"] * ldict["csi"])
sum52 += u_loc2.norm(omega_star_product)[0]**2
rs1 = gq["continuity_constant"] / gq["inf_sup_constant"] * norm(
sum1)[0] / norm(u)[0]
rs2 = gq["continuity_constant"] / gq[
"inf_sup_constant"] * 2 * np.sqrt(sum2) / norm(u)[0]
rs3 = gq["continuity_constant"] / gq[
"inf_sup_constant"] * 2 * np.sqrt(sum3) / norm(u)[0]
rs4 = gq["continuity_constant"] / gq[
"inf_sup_constant"] * 2 * np.sqrt(sum4) / norm(u)[0]
rs5 = gq["continuity_constant"] / gq["inf_sup_constant"] * 2 * max(
sum51) * np.sqrt(sum52) / norm(u)[0]
rs6 = gq["continuity_constant"] / gq["inf_sup_constant"] * max(
sum51) * 8
ccs = gq["continuity_constant"] / gq["inf_sup_constant"]
dats.append([ls, rs1, rs2, rs3, rs4, rs5, rs6, ccs])
return dats