def test_dm_to_dist():
""" Test that astropy units / angles work with dm_to_dist """
a = pygedm.dm_to_dist(204, -6.5, 200, method='ne2001')
b = pygedm.dm_to_dist(Angle(204, unit='degree'), Angle(-6.5, unit='degree'), 200, method='ne2001')
c = pygedm.dm_to_dist(204, -6.5, 200 * Unit('pc cm^-3'), method='ne2001')
assert a[0] == b[0] == c[0]
assert a[1] == b[1] == c[1]
def test_tau_sc_nu():
""" Test that tau_sc changes with nu """
dm, tau_sc = pygedm.dist_to_dm(0, 0, 100, method='ymw16', nu=1)
dm_, tau_sc_ = pygedm.dist_to_dm(0, 0, 100, method='ymw16', nu=1000*u.MHz)
assert dm == dm_
assert tau_sc == tau_sc_
dm, tau_sc = pygedm.dist_to_dm(0, 0, 100, method='ne2001', nu=1)
dm_, tau_sc_ = pygedm.dist_to_dm(0, 0, 100, method='ne2001', nu=1000*u.MHz)
assert dm == dm_
assert tau_sc == tau_sc_
dist, tau_sc = pygedm.dist_to_dm(0, 0, 100, method='ymw16', nu=1)
dist_, tau_sc_ = pygedm.dist_to_dm(0, 0, 100, method='ymw16', nu=1000*u.MHz)
assert dist == dist_
assert tau_sc == tau_sc_
dist, tau_sc = pygedm.dist_to_dm(0, 0, 100, method='ne2001', nu=1)
dist_, tau_sc_ = pygedm.dist_to_dm(0, 0, 100, method='ne2001', nu=1000*u.MHz)
assert dist == dist_
assert tau_sc == tau_sc_
dm, tau_sc_1GHz = pygedm.dm_to_dist(0, 0, 1000, method='ymw16', nu=1.0)
dm, tau_sc_100MHz = pygedm.dm_to_dist(0, 0, 1000, method='ymw16', nu=0.1)
assert np.isclose(tau_sc_1GHz.value, 0.31681767)
assert np.isclose(tau_sc_100MHz.value, 3168.17671061)
assert np.isclose((0.1/1.0)**(-4) * tau_sc_1GHz.value, tau_sc_100MHz.value)
dm, tau_sc_1GHz = pygedm.dm_to_dist(0, 0, 1000, method='ne2001', nu=1.0)
dm, tau_sc_100MHz = pygedm.dm_to_dist(0, 0, 1000, method='ne2001', nu=0.1)
assert np.isclose(tau_sc_1GHz.value, 198.57881596)
assert np.isclose(tau_sc_100MHz.value, 4988074.33385041)
def test_raises():
""" Test that IGM mode FAILS as expected """
with pytest.raises(RuntimeError):
pygedm.dm_to_dist(100, 10, 100, method='ymw1066')
with pytest.raises(RuntimeError):
pygedm.dist_to_dm(100, 10, 100, method='ne2020')
with pytest.raises(RuntimeError):
pygedm.calculate_electron_density_xyz(100, 10, 100, method='tc93')
with pytest.raises(RuntimeError):
pygedm.calculate_electron_density_lbr(100,
10,
100,
method='ymwPaleolithic')
with pytest.raises(RuntimeError):
pygedm.dist_to_dm(100, 10, 100, mode='igm', method='ne2001')
with pytest.raises(RuntimeError):
pygedm.convert_lbr_to_xyz(0, 0, 0, method='chicken')
def test_igm():
""" Test that IGM mode works as expected
Note: tested against YMW16 code with:
# CMD: ./ ymw16 -d data -v IGM 204 -6.5 2000 100 1
# OUTPUT: DM_Gal: 252.05 DM_MC: 0.00 DM_IGM: 1647.95 DM_Host: 100.00
# z: 2.311 Dist: 5336.4 log(tau_sc): -2.218
"""
dist, tau = pygedm.dm_to_dist(204, -6.5, 2000, dm_host=100, mode='igm')
assert np.isclose(dist.value, 5336.4, rtol=0.1)
assert np.isclose(np.log10(tau.value), -2.218, rtol=0.1)
dm, tau = pygedm.dist_to_dm(204, -6.5, 5336.4, mode='igm')
dm_total = dm.value + 252.05 + 100 # Add galactic and host contribution
assert np.isclose(dm_total, 2000, rtol=0.1)
dm, tau = pygedm.dist_to_dm(204, -6.5, 5336.4 * u.Mpc, mode='igm')
dm_total = dm.value + 252.05 + 100 # Add galactic and host contribution
assert np.isclose(dm_total, 2000, rtol=0.1)
def test_basic():
""" Basic tests of YMW16 model
Note: tested against online NE2001 interface
https://www.nrl.navy.mil/rsd/RORF/ne2001/
"""
# No access to actual model via web interface
#a = pygedm.calculate_electron_density_xyz(1, 2, 3)
#assert np.isclose(a.value, 5.220655, atol=0.0001)
# FRB180301 value
dm, tau = pygedm.dist_to_dm(204, -6.5, 25*u.kpc, method='ne2001')
assert np.isclose(dm.value, 150.80, atol=0.01)
# Loop through distances and check round trip
for dist in (10.*u.pc, 100.*u.pc, 1000.*u.pc):
dm, tau = pygedm.dist_to_dm(0, 0, dist, method='ne2001')
dist_out, tau = pygedm.dm_to_dist(0, 0, dm, method='ne2001')
print(dist, dm, dist_out)
assert np.isclose(dist_out.to('pc').value, dist.to('pc').value, rtol=0.1)
def test_basic():
""" Basic tests of YMW16 model
Note: tested against online YMW16 interface
http://www.atnf.csiro.au/research/pulsar/ymw16/index.php
"""
a = pygedm.calculate_electron_density_xyz(1, 2, 3)
assert np.isclose(a.value, 5.220655, atol=0.0001)
a = pygedm.calculate_electron_density_lbr(0, 0, 4000)
assert np.isclose(a.value, 0.388407, atol=0.0001)
# FRB180301 value
dm, tau = pygedm.dist_to_dm(204, -6.5, 25000)
assert np.isclose(dm.value, 252.0501, atol=0.01)
# Loop through distances and check round trip
for dist in (10., 100., 1000.):
dm, tau = pygedm.dist_to_dm(0, 0, dist)
dist_out, tau = pygedm.dm_to_dist(0, 0, dm.value)
assert np.isclose(dist_out.value, dist, rtol=0.1)
import pygedm
print("\n--- DM to dist ---")
print("YMW16:", pygedm.dm_to_dist(100, 0, 250, dm_host=0, method='ymw16'))
print("NE2001:", pygedm.dm_to_dist(100, 0, 250, dm_host=0, method='ne2001'))
print("\n--- dist to DM ---")
print("YMW16:", pygedm.dist_to_dm(100, 0, 250, method='ymw16'))
print("NE2001:", pygedm.dist_to_dm(100, 0, 250, method='ne2001'))
print("\n--- Electron density ---")
print("YMW16:", pygedm.calculate_electron_density_xyz(0, 0, 0, method='ymw16'))
print("NE2001:", pygedm.calculate_electron_density_xyz(0, 0, 0, method='ne2001'))
def test_igm():
""" Test that IGM mode FAILS as expected """
with pytest.raises(RuntimeError):
pygedm.dm_to_dist(100, 10, 100, mode='igm', method='ne2001')
