You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
710 lines
20 KiB
Python
710 lines
20 KiB
Python
import sys
|
|
|
|
try:
|
|
from StringIO import StringIO
|
|
except ImportError:
|
|
from io import StringIO
|
|
|
|
import numpy as np
|
|
from numpy.testing import (assert_, assert_array_equal, assert_allclose,
|
|
assert_equal)
|
|
from pytest import raises as assert_raises
|
|
|
|
from scipy.sparse import coo_matrix
|
|
from scipy.special import erf
|
|
from scipy.integrate._bvp import (modify_mesh, estimate_fun_jac,
|
|
estimate_bc_jac, compute_jac_indices,
|
|
construct_global_jac, solve_bvp)
|
|
|
|
|
|
def exp_fun(x, y):
|
|
return np.vstack((y[1], y[0]))
|
|
|
|
|
|
def exp_fun_jac(x, y):
|
|
df_dy = np.empty((2, 2, x.shape[0]))
|
|
df_dy[0, 0] = 0
|
|
df_dy[0, 1] = 1
|
|
df_dy[1, 0] = 1
|
|
df_dy[1, 1] = 0
|
|
return df_dy
|
|
|
|
|
|
def exp_bc(ya, yb):
|
|
return np.hstack((ya[0] - 1, yb[0]))
|
|
|
|
|
|
def exp_bc_complex(ya, yb):
|
|
return np.hstack((ya[0] - 1 - 1j, yb[0]))
|
|
|
|
|
|
def exp_bc_jac(ya, yb):
|
|
dbc_dya = np.array([
|
|
[1, 0],
|
|
[0, 0]
|
|
])
|
|
dbc_dyb = np.array([
|
|
[0, 0],
|
|
[1, 0]
|
|
])
|
|
return dbc_dya, dbc_dyb
|
|
|
|
|
|
def exp_sol(x):
|
|
return (np.exp(-x) - np.exp(x - 2)) / (1 - np.exp(-2))
|
|
|
|
|
|
def sl_fun(x, y, p):
|
|
return np.vstack((y[1], -p[0]**2 * y[0]))
|
|
|
|
|
|
def sl_fun_jac(x, y, p):
|
|
n, m = y.shape
|
|
df_dy = np.empty((n, 2, m))
|
|
df_dy[0, 0] = 0
|
|
df_dy[0, 1] = 1
|
|
df_dy[1, 0] = -p[0]**2
|
|
df_dy[1, 1] = 0
|
|
|
|
df_dp = np.empty((n, 1, m))
|
|
df_dp[0, 0] = 0
|
|
df_dp[1, 0] = -2 * p[0] * y[0]
|
|
|
|
return df_dy, df_dp
|
|
|
|
|
|
def sl_bc(ya, yb, p):
|
|
return np.hstack((ya[0], yb[0], ya[1] - p[0]))
|
|
|
|
|
|
def sl_bc_jac(ya, yb, p):
|
|
dbc_dya = np.zeros((3, 2))
|
|
dbc_dya[0, 0] = 1
|
|
dbc_dya[2, 1] = 1
|
|
|
|
dbc_dyb = np.zeros((3, 2))
|
|
dbc_dyb[1, 0] = 1
|
|
|
|
dbc_dp = np.zeros((3, 1))
|
|
dbc_dp[2, 0] = -1
|
|
|
|
return dbc_dya, dbc_dyb, dbc_dp
|
|
|
|
|
|
def sl_sol(x, p):
|
|
return np.sin(p[0] * x)
|
|
|
|
|
|
def emden_fun(x, y):
|
|
return np.vstack((y[1], -y[0]**5))
|
|
|
|
|
|
def emden_fun_jac(x, y):
|
|
df_dy = np.empty((2, 2, x.shape[0]))
|
|
df_dy[0, 0] = 0
|
|
df_dy[0, 1] = 1
|
|
df_dy[1, 0] = -5 * y[0]**4
|
|
df_dy[1, 1] = 0
|
|
return df_dy
|
|
|
|
|
|
def emden_bc(ya, yb):
|
|
return np.array([ya[1], yb[0] - (3/4)**0.5])
|
|
|
|
|
|
def emden_bc_jac(ya, yb):
|
|
dbc_dya = np.array([
|
|
[0, 1],
|
|
[0, 0]
|
|
])
|
|
dbc_dyb = np.array([
|
|
[0, 0],
|
|
[1, 0]
|
|
])
|
|
return dbc_dya, dbc_dyb
|
|
|
|
|
|
def emden_sol(x):
|
|
return (1 + x**2/3)**-0.5
|
|
|
|
|
|
def undefined_fun(x, y):
|
|
return np.zeros_like(y)
|
|
|
|
|
|
def undefined_bc(ya, yb):
|
|
return np.array([ya[0], yb[0] - 1])
|
|
|
|
|
|
def big_fun(x, y):
|
|
f = np.zeros_like(y)
|
|
f[::2] = y[1::2]
|
|
return f
|
|
|
|
|
|
def big_bc(ya, yb):
|
|
return np.hstack((ya[::2], yb[::2] - 1))
|
|
|
|
|
|
def big_sol(x, n):
|
|
y = np.ones((2 * n, x.size))
|
|
y[::2] = x
|
|
return x
|
|
|
|
|
|
def big_fun_with_parameters(x, y, p):
|
|
""" Big version of sl_fun, with two parameters.
|
|
|
|
The two differential equations represented by sl_fun are broadcast to the
|
|
number of rows of y, rotating between the parameters p[0] and p[1].
|
|
Here are the differential equations:
|
|
|
|
dy[0]/dt = y[1]
|
|
dy[1]/dt = -p[0]**2 * y[0]
|
|
dy[2]/dt = y[3]
|
|
dy[3]/dt = -p[1]**2 * y[2]
|
|
dy[4]/dt = y[5]
|
|
dy[5]/dt = -p[0]**2 * y[4]
|
|
dy[6]/dt = y[7]
|
|
dy[7]/dt = -p[1]**2 * y[6]
|
|
.
|
|
.
|
|
.
|
|
|
|
"""
|
|
f = np.zeros_like(y)
|
|
f[::2] = y[1::2]
|
|
f[1::4] = -p[0]**2 * y[::4]
|
|
f[3::4] = -p[1]**2 * y[2::4]
|
|
return f
|
|
|
|
|
|
def big_fun_with_parameters_jac(x, y, p):
|
|
# big version of sl_fun_jac, with two parameters
|
|
n, m = y.shape
|
|
df_dy = np.zeros((n, n, m))
|
|
df_dy[range(0, n, 2), range(1, n, 2)] = 1
|
|
df_dy[range(1, n, 4), range(0, n, 4)] = -p[0]**2
|
|
df_dy[range(3, n, 4), range(2, n, 4)] = -p[1]**2
|
|
|
|
df_dp = np.zeros((n, 2, m))
|
|
df_dp[range(1, n, 4), 0] = -2 * p[0] * y[range(0, n, 4)]
|
|
df_dp[range(3, n, 4), 1] = -2 * p[1] * y[range(2, n, 4)]
|
|
|
|
return df_dy, df_dp
|
|
|
|
|
|
def big_bc_with_parameters(ya, yb, p):
|
|
# big version of sl_bc, with two parameters
|
|
return np.hstack((ya[::2], yb[::2], ya[1] - p[0], ya[3] - p[1]))
|
|
|
|
|
|
def big_bc_with_parameters_jac(ya, yb, p):
|
|
# big version of sl_bc_jac, with two parameters
|
|
n = ya.shape[0]
|
|
dbc_dya = np.zeros((n + 2, n))
|
|
dbc_dyb = np.zeros((n + 2, n))
|
|
|
|
dbc_dya[range(n // 2), range(0, n, 2)] = 1
|
|
dbc_dyb[range(n // 2, n), range(0, n, 2)] = 1
|
|
|
|
dbc_dp = np.zeros((n + 2, 2))
|
|
dbc_dp[n, 0] = -1
|
|
dbc_dya[n, 1] = 1
|
|
dbc_dp[n + 1, 1] = -1
|
|
dbc_dya[n + 1, 3] = 1
|
|
|
|
return dbc_dya, dbc_dyb, dbc_dp
|
|
|
|
|
|
def big_sol_with_parameters(x, p):
|
|
# big version of sl_sol, with two parameters
|
|
return np.vstack((np.sin(p[0] * x), np.sin(p[1] * x)))
|
|
|
|
|
|
def shock_fun(x, y):
|
|
eps = 1e-3
|
|
return np.vstack((
|
|
y[1],
|
|
-(x * y[1] + eps * np.pi**2 * np.cos(np.pi * x) +
|
|
np.pi * x * np.sin(np.pi * x)) / eps
|
|
))
|
|
|
|
|
|
def shock_bc(ya, yb):
|
|
return np.array([ya[0] + 2, yb[0]])
|
|
|
|
|
|
def shock_sol(x):
|
|
eps = 1e-3
|
|
k = np.sqrt(2 * eps)
|
|
return np.cos(np.pi * x) + erf(x / k) / erf(1 / k)
|
|
|
|
|
|
def nonlin_bc_fun(x, y):
|
|
# laplace eq.
|
|
return np.stack([y[1], np.zeros_like(x)])
|
|
|
|
|
|
def nonlin_bc_bc(ya, yb):
|
|
phiA, phipA = ya
|
|
phiC, phipC = yb
|
|
|
|
kappa, ioA, ioC, V, f = 1.64, 0.01, 1.0e-4, 0.5, 38.9
|
|
|
|
# Butler-Volmer Kinetics at Anode
|
|
hA = 0.0-phiA-0.0
|
|
iA = ioA * (np.exp(f*hA) - np.exp(-f*hA))
|
|
res0 = iA + kappa * phipA
|
|
|
|
# Butler-Volmer Kinetics at Cathode
|
|
hC = V - phiC - 1.0
|
|
iC = ioC * (np.exp(f*hC) - np.exp(-f*hC))
|
|
res1 = iC - kappa*phipC
|
|
|
|
return np.array([res0, res1])
|
|
|
|
|
|
def nonlin_bc_sol(x):
|
|
return -0.13426436116763119 - 1.1308709 * x
|
|
|
|
|
|
def test_modify_mesh():
|
|
x = np.array([0, 1, 3, 9], dtype=float)
|
|
x_new = modify_mesh(x, np.array([0]), np.array([2]))
|
|
assert_array_equal(x_new, np.array([0, 0.5, 1, 3, 5, 7, 9]))
|
|
|
|
x = np.array([-6, -3, 0, 3, 6], dtype=float)
|
|
x_new = modify_mesh(x, np.array([1], dtype=int), np.array([0, 2, 3]))
|
|
assert_array_equal(x_new, [-6, -5, -4, -3, -1.5, 0, 1, 2, 3, 4, 5, 6])
|
|
|
|
|
|
def test_compute_fun_jac():
|
|
x = np.linspace(0, 1, 5)
|
|
y = np.empty((2, x.shape[0]))
|
|
y[0] = 0.01
|
|
y[1] = 0.02
|
|
p = np.array([])
|
|
df_dy, df_dp = estimate_fun_jac(lambda x, y, p: exp_fun(x, y), x, y, p)
|
|
df_dy_an = exp_fun_jac(x, y)
|
|
assert_allclose(df_dy, df_dy_an)
|
|
assert_(df_dp is None)
|
|
|
|
x = np.linspace(0, np.pi, 5)
|
|
y = np.empty((2, x.shape[0]))
|
|
y[0] = np.sin(x)
|
|
y[1] = np.cos(x)
|
|
p = np.array([1.0])
|
|
df_dy, df_dp = estimate_fun_jac(sl_fun, x, y, p)
|
|
df_dy_an, df_dp_an = sl_fun_jac(x, y, p)
|
|
assert_allclose(df_dy, df_dy_an)
|
|
assert_allclose(df_dp, df_dp_an)
|
|
|
|
x = np.linspace(0, 1, 10)
|
|
y = np.empty((2, x.shape[0]))
|
|
y[0] = (3/4)**0.5
|
|
y[1] = 1e-4
|
|
p = np.array([])
|
|
df_dy, df_dp = estimate_fun_jac(lambda x, y, p: emden_fun(x, y), x, y, p)
|
|
df_dy_an = emden_fun_jac(x, y)
|
|
assert_allclose(df_dy, df_dy_an)
|
|
assert_(df_dp is None)
|
|
|
|
|
|
def test_compute_bc_jac():
|
|
ya = np.array([-1.0, 2])
|
|
yb = np.array([0.5, 3])
|
|
p = np.array([])
|
|
dbc_dya, dbc_dyb, dbc_dp = estimate_bc_jac(
|
|
lambda ya, yb, p: exp_bc(ya, yb), ya, yb, p)
|
|
dbc_dya_an, dbc_dyb_an = exp_bc_jac(ya, yb)
|
|
assert_allclose(dbc_dya, dbc_dya_an)
|
|
assert_allclose(dbc_dyb, dbc_dyb_an)
|
|
assert_(dbc_dp is None)
|
|
|
|
ya = np.array([0.0, 1])
|
|
yb = np.array([0.0, -1])
|
|
p = np.array([0.5])
|
|
dbc_dya, dbc_dyb, dbc_dp = estimate_bc_jac(sl_bc, ya, yb, p)
|
|
dbc_dya_an, dbc_dyb_an, dbc_dp_an = sl_bc_jac(ya, yb, p)
|
|
assert_allclose(dbc_dya, dbc_dya_an)
|
|
assert_allclose(dbc_dyb, dbc_dyb_an)
|
|
assert_allclose(dbc_dp, dbc_dp_an)
|
|
|
|
ya = np.array([0.5, 100])
|
|
yb = np.array([-1000, 10.5])
|
|
p = np.array([])
|
|
dbc_dya, dbc_dyb, dbc_dp = estimate_bc_jac(
|
|
lambda ya, yb, p: emden_bc(ya, yb), ya, yb, p)
|
|
dbc_dya_an, dbc_dyb_an = emden_bc_jac(ya, yb)
|
|
assert_allclose(dbc_dya, dbc_dya_an)
|
|
assert_allclose(dbc_dyb, dbc_dyb_an)
|
|
assert_(dbc_dp is None)
|
|
|
|
|
|
def test_compute_jac_indices():
|
|
n = 2
|
|
m = 4
|
|
k = 2
|
|
i, j = compute_jac_indices(n, m, k)
|
|
s = coo_matrix((np.ones_like(i), (i, j))).toarray()
|
|
s_true = np.array([
|
|
[1, 1, 1, 1, 0, 0, 0, 0, 1, 1],
|
|
[1, 1, 1, 1, 0, 0, 0, 0, 1, 1],
|
|
[0, 0, 1, 1, 1, 1, 0, 0, 1, 1],
|
|
[0, 0, 1, 1, 1, 1, 0, 0, 1, 1],
|
|
[0, 0, 0, 0, 1, 1, 1, 1, 1, 1],
|
|
[0, 0, 0, 0, 1, 1, 1, 1, 1, 1],
|
|
[1, 1, 0, 0, 0, 0, 1, 1, 1, 1],
|
|
[1, 1, 0, 0, 0, 0, 1, 1, 1, 1],
|
|
[1, 1, 0, 0, 0, 0, 1, 1, 1, 1],
|
|
[1, 1, 0, 0, 0, 0, 1, 1, 1, 1],
|
|
])
|
|
assert_array_equal(s, s_true)
|
|
|
|
|
|
def test_compute_global_jac():
|
|
n = 2
|
|
m = 5
|
|
k = 1
|
|
i_jac, j_jac = compute_jac_indices(2, 5, 1)
|
|
x = np.linspace(0, 1, 5)
|
|
h = np.diff(x)
|
|
y = np.vstack((np.sin(np.pi * x), np.pi * np.cos(np.pi * x)))
|
|
p = np.array([3.0])
|
|
|
|
f = sl_fun(x, y, p)
|
|
|
|
x_middle = x[:-1] + 0.5 * h
|
|
y_middle = 0.5 * (y[:, :-1] + y[:, 1:]) - h/8 * (f[:, 1:] - f[:, :-1])
|
|
|
|
df_dy, df_dp = sl_fun_jac(x, y, p)
|
|
df_dy_middle, df_dp_middle = sl_fun_jac(x_middle, y_middle, p)
|
|
dbc_dya, dbc_dyb, dbc_dp = sl_bc_jac(y[:, 0], y[:, -1], p)
|
|
|
|
J = construct_global_jac(n, m, k, i_jac, j_jac, h, df_dy, df_dy_middle,
|
|
df_dp, df_dp_middle, dbc_dya, dbc_dyb, dbc_dp)
|
|
J = J.toarray()
|
|
|
|
def J_block(h, p):
|
|
return np.array([
|
|
[h**2*p**2/12 - 1, -0.5*h, -h**2*p**2/12 + 1, -0.5*h],
|
|
[0.5*h*p**2, h**2*p**2/12 - 1, 0.5*h*p**2, 1 - h**2*p**2/12]
|
|
])
|
|
|
|
J_true = np.zeros((m * n + k, m * n + k))
|
|
for i in range(m - 1):
|
|
J_true[i * n: (i + 1) * n, i * n: (i + 2) * n] = J_block(h[i], p[0])
|
|
|
|
J_true[:(m - 1) * n:2, -1] = p * h**2/6 * (y[0, :-1] - y[0, 1:])
|
|
J_true[1:(m - 1) * n:2, -1] = p * (h * (y[0, :-1] + y[0, 1:]) +
|
|
h**2/6 * (y[1, :-1] - y[1, 1:]))
|
|
|
|
J_true[8, 0] = 1
|
|
J_true[9, 8] = 1
|
|
J_true[10, 1] = 1
|
|
J_true[10, 10] = -1
|
|
|
|
assert_allclose(J, J_true, rtol=1e-10)
|
|
|
|
df_dy, df_dp = estimate_fun_jac(sl_fun, x, y, p)
|
|
df_dy_middle, df_dp_middle = estimate_fun_jac(sl_fun, x_middle, y_middle, p)
|
|
dbc_dya, dbc_dyb, dbc_dp = estimate_bc_jac(sl_bc, y[:, 0], y[:, -1], p)
|
|
J = construct_global_jac(n, m, k, i_jac, j_jac, h, df_dy, df_dy_middle,
|
|
df_dp, df_dp_middle, dbc_dya, dbc_dyb, dbc_dp)
|
|
J = J.toarray()
|
|
assert_allclose(J, J_true, rtol=1e-8, atol=1e-9)
|
|
|
|
|
|
def test_parameter_validation():
|
|
x = [0, 1, 0.5]
|
|
y = np.zeros((2, 3))
|
|
assert_raises(ValueError, solve_bvp, exp_fun, exp_bc, x, y)
|
|
|
|
x = np.linspace(0, 1, 5)
|
|
y = np.zeros((2, 4))
|
|
assert_raises(ValueError, solve_bvp, exp_fun, exp_bc, x, y)
|
|
|
|
fun = lambda x, y, p: exp_fun(x, y)
|
|
bc = lambda ya, yb, p: exp_bc(ya, yb)
|
|
|
|
y = np.zeros((2, x.shape[0]))
|
|
assert_raises(ValueError, solve_bvp, fun, bc, x, y, p=[1])
|
|
|
|
def wrong_shape_fun(x, y):
|
|
return np.zeros(3)
|
|
|
|
assert_raises(ValueError, solve_bvp, wrong_shape_fun, bc, x, y)
|
|
|
|
S = np.array([[0, 0]])
|
|
assert_raises(ValueError, solve_bvp, exp_fun, exp_bc, x, y, S=S)
|
|
|
|
|
|
def test_no_params():
|
|
x = np.linspace(0, 1, 5)
|
|
x_test = np.linspace(0, 1, 100)
|
|
y = np.zeros((2, x.shape[0]))
|
|
for fun_jac in [None, exp_fun_jac]:
|
|
for bc_jac in [None, exp_bc_jac]:
|
|
sol = solve_bvp(exp_fun, exp_bc, x, y, fun_jac=fun_jac,
|
|
bc_jac=bc_jac)
|
|
|
|
assert_equal(sol.status, 0)
|
|
assert_(sol.success)
|
|
|
|
assert_equal(sol.x.size, 5)
|
|
|
|
sol_test = sol.sol(x_test)
|
|
|
|
assert_allclose(sol_test[0], exp_sol(x_test), atol=1e-5)
|
|
|
|
f_test = exp_fun(x_test, sol_test)
|
|
r = sol.sol(x_test, 1) - f_test
|
|
rel_res = r / (1 + np.abs(f_test))
|
|
norm_res = np.sum(rel_res**2, axis=0)**0.5
|
|
assert_(np.all(norm_res < 1e-3))
|
|
|
|
assert_(np.all(sol.rms_residuals < 1e-3))
|
|
assert_allclose(sol.sol(sol.x), sol.y, rtol=1e-10, atol=1e-10)
|
|
assert_allclose(sol.sol(sol.x, 1), sol.yp, rtol=1e-10, atol=1e-10)
|
|
|
|
|
|
def test_with_params():
|
|
x = np.linspace(0, np.pi, 5)
|
|
x_test = np.linspace(0, np.pi, 100)
|
|
y = np.ones((2, x.shape[0]))
|
|
|
|
for fun_jac in [None, sl_fun_jac]:
|
|
for bc_jac in [None, sl_bc_jac]:
|
|
sol = solve_bvp(sl_fun, sl_bc, x, y, p=[0.5], fun_jac=fun_jac,
|
|
bc_jac=bc_jac)
|
|
|
|
assert_equal(sol.status, 0)
|
|
assert_(sol.success)
|
|
|
|
assert_(sol.x.size < 10)
|
|
|
|
assert_allclose(sol.p, [1], rtol=1e-4)
|
|
|
|
sol_test = sol.sol(x_test)
|
|
|
|
assert_allclose(sol_test[0], sl_sol(x_test, [1]),
|
|
rtol=1e-4, atol=1e-4)
|
|
|
|
f_test = sl_fun(x_test, sol_test, [1])
|
|
r = sol.sol(x_test, 1) - f_test
|
|
rel_res = r / (1 + np.abs(f_test))
|
|
norm_res = np.sum(rel_res ** 2, axis=0) ** 0.5
|
|
assert_(np.all(norm_res < 1e-3))
|
|
|
|
assert_(np.all(sol.rms_residuals < 1e-3))
|
|
assert_allclose(sol.sol(sol.x), sol.y, rtol=1e-10, atol=1e-10)
|
|
assert_allclose(sol.sol(sol.x, 1), sol.yp, rtol=1e-10, atol=1e-10)
|
|
|
|
|
|
def test_singular_term():
|
|
x = np.linspace(0, 1, 10)
|
|
x_test = np.linspace(0.05, 1, 100)
|
|
y = np.empty((2, 10))
|
|
y[0] = (3/4)**0.5
|
|
y[1] = 1e-4
|
|
S = np.array([[0, 0], [0, -2]])
|
|
|
|
for fun_jac in [None, emden_fun_jac]:
|
|
for bc_jac in [None, emden_bc_jac]:
|
|
sol = solve_bvp(emden_fun, emden_bc, x, y, S=S, fun_jac=fun_jac,
|
|
bc_jac=bc_jac)
|
|
|
|
assert_equal(sol.status, 0)
|
|
assert_(sol.success)
|
|
|
|
assert_equal(sol.x.size, 10)
|
|
|
|
sol_test = sol.sol(x_test)
|
|
assert_allclose(sol_test[0], emden_sol(x_test), atol=1e-5)
|
|
|
|
f_test = emden_fun(x_test, sol_test) + S.dot(sol_test) / x_test
|
|
r = sol.sol(x_test, 1) - f_test
|
|
rel_res = r / (1 + np.abs(f_test))
|
|
norm_res = np.sum(rel_res ** 2, axis=0) ** 0.5
|
|
|
|
assert_(np.all(norm_res < 1e-3))
|
|
assert_allclose(sol.sol(sol.x), sol.y, rtol=1e-10, atol=1e-10)
|
|
assert_allclose(sol.sol(sol.x, 1), sol.yp, rtol=1e-10, atol=1e-10)
|
|
|
|
|
|
def test_complex():
|
|
# The test is essentially the same as test_no_params, but boundary
|
|
# conditions are turned into complex.
|
|
x = np.linspace(0, 1, 5)
|
|
x_test = np.linspace(0, 1, 100)
|
|
y = np.zeros((2, x.shape[0]), dtype=complex)
|
|
for fun_jac in [None, exp_fun_jac]:
|
|
for bc_jac in [None, exp_bc_jac]:
|
|
sol = solve_bvp(exp_fun, exp_bc_complex, x, y, fun_jac=fun_jac,
|
|
bc_jac=bc_jac)
|
|
|
|
assert_equal(sol.status, 0)
|
|
assert_(sol.success)
|
|
|
|
sol_test = sol.sol(x_test)
|
|
|
|
assert_allclose(sol_test[0].real, exp_sol(x_test), atol=1e-5)
|
|
assert_allclose(sol_test[0].imag, exp_sol(x_test), atol=1e-5)
|
|
|
|
f_test = exp_fun(x_test, sol_test)
|
|
r = sol.sol(x_test, 1) - f_test
|
|
rel_res = r / (1 + np.abs(f_test))
|
|
norm_res = np.sum(np.real(rel_res * np.conj(rel_res)),
|
|
axis=0) ** 0.5
|
|
assert_(np.all(norm_res < 1e-3))
|
|
|
|
assert_(np.all(sol.rms_residuals < 1e-3))
|
|
assert_allclose(sol.sol(sol.x), sol.y, rtol=1e-10, atol=1e-10)
|
|
assert_allclose(sol.sol(sol.x, 1), sol.yp, rtol=1e-10, atol=1e-10)
|
|
|
|
|
|
def test_failures():
|
|
x = np.linspace(0, 1, 2)
|
|
y = np.zeros((2, x.size))
|
|
res = solve_bvp(exp_fun, exp_bc, x, y, tol=1e-5, max_nodes=5)
|
|
assert_equal(res.status, 1)
|
|
assert_(not res.success)
|
|
|
|
x = np.linspace(0, 1, 5)
|
|
y = np.zeros((2, x.size))
|
|
res = solve_bvp(undefined_fun, undefined_bc, x, y)
|
|
assert_equal(res.status, 2)
|
|
assert_(not res.success)
|
|
|
|
|
|
def test_big_problem():
|
|
n = 30
|
|
x = np.linspace(0, 1, 5)
|
|
y = np.zeros((2 * n, x.size))
|
|
sol = solve_bvp(big_fun, big_bc, x, y)
|
|
|
|
assert_equal(sol.status, 0)
|
|
assert_(sol.success)
|
|
|
|
sol_test = sol.sol(x)
|
|
|
|
assert_allclose(sol_test[0], big_sol(x, n))
|
|
|
|
f_test = big_fun(x, sol_test)
|
|
r = sol.sol(x, 1) - f_test
|
|
rel_res = r / (1 + np.abs(f_test))
|
|
norm_res = np.sum(np.real(rel_res * np.conj(rel_res)), axis=0) ** 0.5
|
|
assert_(np.all(norm_res < 1e-3))
|
|
|
|
assert_(np.all(sol.rms_residuals < 1e-3))
|
|
assert_allclose(sol.sol(sol.x), sol.y, rtol=1e-10, atol=1e-10)
|
|
assert_allclose(sol.sol(sol.x, 1), sol.yp, rtol=1e-10, atol=1e-10)
|
|
|
|
|
|
def test_big_problem_with_parameters():
|
|
n = 30
|
|
x = np.linspace(0, np.pi, 5)
|
|
x_test = np.linspace(0, np.pi, 100)
|
|
y = np.ones((2 * n, x.size))
|
|
|
|
for fun_jac in [None, big_fun_with_parameters_jac]:
|
|
for bc_jac in [None, big_bc_with_parameters_jac]:
|
|
sol = solve_bvp(big_fun_with_parameters, big_bc_with_parameters, x,
|
|
y, p=[0.5, 0.5], fun_jac=fun_jac, bc_jac=bc_jac)
|
|
|
|
assert_equal(sol.status, 0)
|
|
assert_(sol.success)
|
|
|
|
assert_allclose(sol.p, [1, 1], rtol=1e-4)
|
|
|
|
sol_test = sol.sol(x_test)
|
|
|
|
for isol in range(0, n, 4):
|
|
assert_allclose(sol_test[isol],
|
|
big_sol_with_parameters(x_test, [1, 1])[0],
|
|
rtol=1e-4, atol=1e-4)
|
|
assert_allclose(sol_test[isol + 2],
|
|
big_sol_with_parameters(x_test, [1, 1])[1],
|
|
rtol=1e-4, atol=1e-4)
|
|
|
|
f_test = big_fun_with_parameters(x_test, sol_test, [1, 1])
|
|
r = sol.sol(x_test, 1) - f_test
|
|
rel_res = r / (1 + np.abs(f_test))
|
|
norm_res = np.sum(rel_res ** 2, axis=0) ** 0.5
|
|
assert_(np.all(norm_res < 1e-3))
|
|
|
|
assert_(np.all(sol.rms_residuals < 1e-3))
|
|
assert_allclose(sol.sol(sol.x), sol.y, rtol=1e-10, atol=1e-10)
|
|
assert_allclose(sol.sol(sol.x, 1), sol.yp, rtol=1e-10, atol=1e-10)
|
|
|
|
|
|
def test_shock_layer():
|
|
x = np.linspace(-1, 1, 5)
|
|
x_test = np.linspace(-1, 1, 100)
|
|
y = np.zeros((2, x.size))
|
|
sol = solve_bvp(shock_fun, shock_bc, x, y)
|
|
|
|
assert_equal(sol.status, 0)
|
|
assert_(sol.success)
|
|
|
|
assert_(sol.x.size < 110)
|
|
|
|
sol_test = sol.sol(x_test)
|
|
assert_allclose(sol_test[0], shock_sol(x_test), rtol=1e-5, atol=1e-5)
|
|
|
|
f_test = shock_fun(x_test, sol_test)
|
|
r = sol.sol(x_test, 1) - f_test
|
|
rel_res = r / (1 + np.abs(f_test))
|
|
norm_res = np.sum(rel_res ** 2, axis=0) ** 0.5
|
|
|
|
assert_(np.all(norm_res < 1e-3))
|
|
assert_allclose(sol.sol(sol.x), sol.y, rtol=1e-10, atol=1e-10)
|
|
assert_allclose(sol.sol(sol.x, 1), sol.yp, rtol=1e-10, atol=1e-10)
|
|
|
|
|
|
def test_nonlin_bc():
|
|
x = np.linspace(0, 0.1, 5)
|
|
x_test = x
|
|
y = np.zeros([2, x.size])
|
|
sol = solve_bvp(nonlin_bc_fun, nonlin_bc_bc, x, y)
|
|
|
|
assert_equal(sol.status, 0)
|
|
assert_(sol.success)
|
|
|
|
assert_(sol.x.size < 8)
|
|
|
|
sol_test = sol.sol(x_test)
|
|
assert_allclose(sol_test[0], nonlin_bc_sol(x_test), rtol=1e-5, atol=1e-5)
|
|
|
|
f_test = nonlin_bc_fun(x_test, sol_test)
|
|
r = sol.sol(x_test, 1) - f_test
|
|
rel_res = r / (1 + np.abs(f_test))
|
|
norm_res = np.sum(rel_res ** 2, axis=0) ** 0.5
|
|
|
|
assert_(np.all(norm_res < 1e-3))
|
|
assert_allclose(sol.sol(sol.x), sol.y, rtol=1e-10, atol=1e-10)
|
|
assert_allclose(sol.sol(sol.x, 1), sol.yp, rtol=1e-10, atol=1e-10)
|
|
|
|
|
|
def test_verbose():
|
|
# Smoke test that checks the printing does something and does not crash
|
|
x = np.linspace(0, 1, 5)
|
|
y = np.zeros((2, x.shape[0]))
|
|
for verbose in [0, 1, 2]:
|
|
old_stdout = sys.stdout
|
|
sys.stdout = StringIO()
|
|
try:
|
|
sol = solve_bvp(exp_fun, exp_bc, x, y, verbose=verbose)
|
|
text = sys.stdout.getvalue()
|
|
finally:
|
|
sys.stdout = old_stdout
|
|
|
|
assert_(sol.success)
|
|
if verbose == 0:
|
|
assert_(not text, text)
|
|
if verbose >= 1:
|
|
assert_("Solved in" in text, text)
|
|
if verbose >= 2:
|
|
assert_("Max residual" in text, text)
|