def test_fit_to_data(self):
"""
Test the Chebyshev.fit_to_data() method.
"""
Tdata = np.array([
300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400,
1500, 1600, 1700, 1800, 1900, 2000
])
Pdata = np.array([3e3, 1e4, 3e4, 1e5, 3e5, 1e6, 3e7])
nT = len(Tdata)
nP = len(Pdata)
kdata = np.zeros((nT, nP))
for t in range(nT):
for p in range(nP):
kdata[t, p] = self.chebyshev.get_rate_coefficient(
Tdata[t], Pdata[p]) * 1e6
chebyshev = Chebyshev().fit_to_data(Tdata,
Pdata,
kdata,
kunits="cm^3/(mol*s)",
degreeT=6,
degreeP=4,
Tmin=300,
Tmax=2000,
Pmin=0.1,
Pmax=10.)
for t in range(nT):
for p in range(nP):
kfit = chebyshev.get_rate_coefficient(Tdata[t], Pdata[p]) * 1e6
self.assertAlmostEqual(kfit,
kdata[t, p],
delta=1e-4 * kdata[t, p])
class TestChebyshev(unittest.TestCase):
"""
Contains unit tests of the Chebyshev class.
"""
def setUp(self):
"""
A function run before each unit test in this class.
"""
self.Tmin = 300.
self.Tmax = 2000.
self.Pmin = 0.01
self.Pmax = 100.
self.coeffs = np.array([
[11.67723, 0.729281, -0.11984, 0.00882175],
[-1.02669, 0.853639, -0.0323485, -0.027367],
[-0.447011, 0.244144, 0.0559122, -0.0101723],
[-0.128261, 0.0111596, 0.0281176, 0.00604353],
[-0.0117034, -0.0235646, 0.00061009, 0.00401309],
[0.0155433, -0.0136846, -0.00463048, -0.000261353],
])
self.comment = """acetyl + O2 -> acetylperoxy"""
self.chebyshev = Chebyshev(
coeffs=self.coeffs,
kunits="cm^3/(mol*s)",
Tmin=(self.Tmin, "K"),
Tmax=(self.Tmax, "K"),
Pmin=(self.Pmin, "bar"),
Pmax=(self.Pmax, "bar"),
comment=self.comment,
)
def test_coeffs(self):
"""
Test that the Chebyshev coeffs property was properly set.
"""
self.assertEqual(self.chebyshev.coeffs.value.shape, self.coeffs.shape)
for i in range(self.chebyshev.coeffs.value.shape[0]):
for j in range(self.chebyshev.coeffs.value.shape[1]):
C0 = float(self.coeffs[i, j])
C = float(self.chebyshev.coeffs.value_si[i, j])
if i == 0 and j == 0:
C0 -= 6 # Unit conversion from cm^3/(mol*s) to m^3/(mol*s)
self.assertAlmostEqual(C0, C, delta=1e-6 * C0)
def test_temperature_min(self):
"""
Test that the Chebyshev Tmin property was properly set.
"""
self.assertAlmostEqual(self.chebyshev.Tmin.value_si, self.Tmin, 6)
def test_temperature_max(self):
"""
Test that the Chebyshev Tmax property was properly set.
"""
self.assertAlmostEqual(self.chebyshev.Tmax.value_si, self.Tmax, 6)
def test_pressure_min(self):
"""
Test that the Chebyshev Pmin property was properly set.
"""
self.assertAlmostEqual(self.chebyshev.Pmin.value_si * 1e-5, self.Pmin,
6)
def test_pressure_max(self):
"""
Test that the Chebyshev Pmax property was properly set.
"""
self.assertAlmostEqual(self.chebyshev.Pmax.value_si * 1e-5, self.Pmax,
6)
def test_comment(self):
"""
Test that the Chebyshev comment property was properly set.
"""
self.assertEqual(self.chebyshev.comment, self.comment)
def test_is_pressure_dependent(self):
"""
Test the Chebyshev.is_pressure_dependent() method.
"""
self.assertTrue(self.chebyshev.is_pressure_dependent())
def test_get_rate_coefficient(self):
"""
Test the Chebyshev.get_rate_coefficient() method.
"""
Tlist = np.array([300, 500, 1000, 1500])
Plist = np.array([1e4, 1e5, 1e6])
Kexp = np.array([
[2.29100e+06, 2.58452e+06, 2.57204e+06],
[1.10198e+06, 2.04037e+06, 2.57428e+06],
[4.37919e+04, 2.36481e+05, 8.57727e+05],
[5.20144e+03, 4.10123e+04, 2.50401e+05],
])
for t in range(Tlist.shape[0]):
for p in range(Plist.shape[0]):
Kact = self.chebyshev.get_rate_coefficient(Tlist[t], Plist[p])
self.assertAlmostEqual(
Kact / Kexp[t, p], 1.0, 4,
'{0} != {1} within 4 places'.format(Kexp[t, p], Kact))
def test_fit_to_data(self):
"""
Test the Chebyshev.fit_to_data() method.
"""
Tdata = np.array([
300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400,
1500, 1600, 1700, 1800, 1900, 2000
])
Pdata = np.array([3e3, 1e4, 3e4, 1e5, 3e5, 1e6, 3e7])
nT = len(Tdata)
nP = len(Pdata)
kdata = np.zeros((nT, nP))
for t in range(nT):
for p in range(nP):
kdata[t, p] = self.chebyshev.get_rate_coefficient(
Tdata[t], Pdata[p]) * 1e6
chebyshev = Chebyshev().fit_to_data(Tdata,
Pdata,
kdata,
kunits="cm^3/(mol*s)",
degreeT=6,
degreeP=4,
Tmin=300,
Tmax=2000,
Pmin=0.1,
Pmax=10.)
for t in range(nT):
for p in range(nP):
kfit = chebyshev.get_rate_coefficient(Tdata[t], Pdata[p]) * 1e6
self.assertAlmostEqual(kfit,
kdata[t, p],
delta=1e-4 * kdata[t, p])
def test_fit_to_data2(self):
"""
Test the Chebyshev.fit_to_data() method throws error without enough degrees of freedom.
Here only 3 temperatures are given, but the polynomial desired has 6 parameters.
"""
Tdata = np.array([300, 1200, 2000])
Pdata = np.array([1e5, 3e5, 1e6, 3e7])
nT = len(Tdata)
nP = len(Pdata)
kdata = np.zeros((nT, nP))
for t in range(nT):
for p in range(nP):
kdata[t, p] = self.chebyshev.get_rate_coefficient(
Tdata[t], Pdata[p])
with self.assertRaises(KineticsError):
Chebyshev().fit_to_data(Tdata,
Pdata,
kdata,
kunits="cm^3/(mol*s)",
degreeT=12,
degreeP=8,
Tmin=300,
Tmax=2000,
Pmin=0.1,
Pmax=10.)
def test_pickle(self):
"""
Test that a Chebyshev object can be pickled and unpickled with no loss
of information.
"""
import pickle
chebyshev = pickle.loads(pickle.dumps(self.chebyshev, -1))
self.assertEqual(self.chebyshev.coeffs.value.shape[0],
chebyshev.coeffs.value.shape[0])
self.assertEqual(self.chebyshev.coeffs.value.shape[1],
chebyshev.coeffs.value.shape[1])
for i in range(self.chebyshev.coeffs.value.shape[0]):
for j in range(self.chebyshev.coeffs.value.shape[1]):
C0 = self.chebyshev.coeffs.value_si[i, j]
C = chebyshev.coeffs.value_si[i, j]
self.assertAlmostEqual(C0, C, delta=1e-4 * C0)
self.assertAlmostEqual(self.chebyshev.Tmin.value, chebyshev.Tmin.value,
4)
self.assertEqual(self.chebyshev.Tmin.units, chebyshev.Tmin.units)
self.assertAlmostEqual(self.chebyshev.Tmax.value, chebyshev.Tmax.value,
4)
self.assertEqual(self.chebyshev.Tmax.units, chebyshev.Tmax.units)
self.assertAlmostEqual(self.chebyshev.Pmin.value, chebyshev.Pmin.value,
4)
self.assertEqual(self.chebyshev.Pmin.units, chebyshev.Pmin.units)
self.assertAlmostEqual(self.chebyshev.Pmax.value, chebyshev.Pmax.value,
4)
self.assertEqual(self.chebyshev.Pmax.units, chebyshev.Pmax.units)
self.assertEqual(self.chebyshev.comment, chebyshev.comment)
def test_repr(self):
"""
Test that a Chebyshev object can be reconstructed from its repr()
output with no loss of information.
"""
namespace = {}
exec('chebyshev = {0!r}'.format(self.chebyshev), globals(), namespace)
self.assertIn('chebyshev', namespace)
chebyshev = namespace['chebyshev']
self.assertEqual(self.chebyshev.coeffs.value.shape[0],
chebyshev.coeffs.value.shape[0])
self.assertEqual(self.chebyshev.coeffs.value.shape[1],
chebyshev.coeffs.value.shape[1])
for i in range(self.chebyshev.coeffs.value.shape[0]):
for j in range(self.chebyshev.coeffs.value.shape[1]):
C0 = self.chebyshev.coeffs.value[i, j]
C = chebyshev.coeffs.value[i, j]
self.assertAlmostEqual(C0, C, delta=1e-4 * C0)
self.assertAlmostEqual(self.chebyshev.Tmin.value, chebyshev.Tmin.value,
4)
self.assertEqual(self.chebyshev.Tmin.units, chebyshev.Tmin.units)
self.assertAlmostEqual(self.chebyshev.Tmax.value, chebyshev.Tmax.value,
4)
self.assertEqual(self.chebyshev.Tmax.units, chebyshev.Tmax.units)
self.assertAlmostEqual(self.chebyshev.Pmin.value, chebyshev.Pmin.value,
4)
self.assertEqual(self.chebyshev.Pmin.units, chebyshev.Pmin.units)
self.assertAlmostEqual(self.chebyshev.Pmax.value, chebyshev.Pmax.value,
4)
self.assertEqual(self.chebyshev.Pmax.units, chebyshev.Pmax.units)
self.assertEqual(self.chebyshev.comment, chebyshev.comment)
def test_change_rate(self):
"""
Test the Chebyshev.change_rate() method.
"""
Tlist = np.array([
300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400,
1500
])
k0list = np.array(
[self.chebyshev.get_rate_coefficient(T, 1e5) for T in Tlist])
self.chebyshev.change_rate(2)
for T, kexp in zip(Tlist, k0list):
kact = self.chebyshev.get_rate_coefficient(T, 1e5)
self.assertAlmostEqual(2 * kexp, kact, delta=1e-6 * kexp)
def test_is_identical_to(self):
"""
Test the Chebyshev.is_identical_to() method.
"""
# Trivial case, compare to a KineticsModel
from rmgpy.kinetics.model import KineticsModel
self.assertFalse(self.chebyshev.is_identical_to(KineticsModel()))
# Compare to identical Chebyshev
new_chebyshev = Chebyshev(
coeffs=self.coeffs,
kunits="cm^3/(mol*s)",
Tmin=(self.Tmin, "K"),
Tmax=(self.Tmax, "K"),
Pmin=(self.Pmin, "bar"),
Pmax=(self.Pmax, "bar"),
comment=self.comment,
)
self.assertTrue(self.chebyshev.is_identical_to(new_chebyshev))
# Compare to Chebyshev with different Tmin/Tmax
new_chebyshev = Chebyshev(
coeffs=self.coeffs,
kunits="cm^3/(mol*s)",
Tmin=(200, "K"),
Tmax=(self.Tmax, "K"),
Pmin=(self.Pmin, "bar"),
Pmax=(self.Pmax, "bar"),
comment=self.comment,
)
self.assertFalse(self.chebyshev.is_identical_to(new_chebyshev))
new_chebyshev = Chebyshev(
coeffs=self.coeffs,
kunits="cm^3/(mol*s)",
Tmin=(self.Tmin, "K"),
Tmax=(2500, "K"),
Pmin=(self.Pmin, "bar"),
Pmax=(self.Pmax, "bar"),
comment=self.comment,
)
self.assertFalse(self.chebyshev.is_identical_to(new_chebyshev))
# Compare to Chebyshev with different degreeT/degreeP
new_chebyshev = Chebyshev(
coeffs=self.coeffs[0:-1, :], # Remove one T dimension
kunits="cm^3/(mol*s)",
Tmin=(self.Tmin, "K"),
Tmax=(self.Tmax, "K"),
Pmin=(self.Pmin, "bar"),
Pmax=(self.Pmax, "bar"),
comment=self.comment,
)
self.assertFalse(self.chebyshev.is_identical_to(new_chebyshev))
new_chebyshev = Chebyshev(
coeffs=self.coeffs[:, 0:-1], # Remove one P dimension
kunits="cm^3/(mol*s)",
Tmin=(self.Tmin, "K"),
Tmax=(self.Tmax, "K"),
Pmin=(self.Pmin, "bar"),
Pmax=(self.Pmax, "bar"),
comment=self.comment,
)
self.assertFalse(self.chebyshev.is_identical_to(new_chebyshev))
# Compare to Chebyshev with different units
new_chebyshev = Chebyshev(
coeffs=self.coeffs,
kunits="m^3/(mol*s)",
Tmin=(self.Tmin, "K"),
Tmax=(self.Tmax, "K"),
Pmin=(self.Pmin, "bar"),
Pmax=(self.Pmax, "bar"),
comment=self.comment,
)
self.assertFalse(self.chebyshev.is_identical_to(new_chebyshev))
# Compare to Chebyshev with slightly different coefficients
new_chebyshev = Chebyshev(
coeffs=np.copy(self.coeffs) * 0.01,
kunits="cm^3/(mol*s)",
Tmin=(self.Tmin, "K"),
Tmax=(self.Tmax, "K"),
Pmin=(self.Pmin, "bar"),
Pmax=(self.Pmax, "bar"),
comment=self.comment,
)
self.assertFalse(self.chebyshev.is_identical_to(new_chebyshev))
