Dynamics data not being transferred when changing frames

[vijayvarma392]

Here's a script to reproduce the issue

import numpy as np

# Start the Julia session
from sxs.julia import PNWaveform

q = 1.0
chiA0 = [0, 0, 0.5]
chiB0 = [0, 0, 0.5]
omega_ref = 1e-2

w = PNWaveform(q/(1+q), 1/(1+q), np.array(chiA0), np.array(chiB0),
                    omega_ref, inertial=True)

# This works fine
chiA = w.chi1
chiB = w.chi2
quat = w.frame
omega_orb = w.v**3 / (w.M1 + w.M2)
phi_orb = w.orbital_phase
print (chiA[0])

w = PNWaveform(q/(1+q), 1/(1+q), np.array(chiA0), np.array(chiB0),
                    omega_ref, inertial=False)
# So does this
chiA = w.chi1
chiB = w.chi2
quat = w.frame
omega_orb = w.v**3 / (w.M1 + w.M2)
phi_orb = w.orbital_phase
print (chiA[0])

# But this doesn't work (AttributeError: 'WaveformModes' object has no attribute 'chi1')
w = w.to_inertial_frame()
chiA = w.chi1
chiB = w.chi2
quat = w.frame
omega_orb = w.v**3 / (w.M1 + w.M2)
phi_orb = w.orbital_phase
print (chiA[0])

[moble]

That's correct. The object returned from PNWaveform is an sxs.WaveformModes, which does not track those things. If you want them, you have to copy them before throwing away the original w.