Getting warning/error with additional forces about reboundx

[tamidodo]

Brilliant, that worked perfectly. Thank you for your time on this!

[dtamayo]

Hi Ian, sorry this fell through the cracks. Are you at DDA? If so feel free to find me anytime. I think I might be able to help faster if we could try things out together on your laptop.

[Bruntonian]

No worries at all, that sounds great, I'll try to find you today.

[tamidodo]

Hello,

I am also running into this situation. I was running my code just fine on my local environment and then when I created a new environment and installed the packages on that computer, my simulations stop running when I try to add radiation forces but run just fine if I take that part out. Same error message, it complains that I "need to attach reboundx.Extras instance to simulation before setting params" even though I definitely have. How do you resolve this?

Thanks,
Tammy

[dtamayo]

Hi Tammy,

Sorry, we sorted this out in person and forgot to close the issue, but it would be good to have a solution here. Could you try making a new environment and doing

pip install reboundx --no-binary :all: --no-cache-dir

[tamidodo]

I tried doing that, still getting the same error. My environment is Python 3.9.7, rebound version 4.3.2, reboundx version 4.1.0. This is to match my local environment which is successfully running simulations. The code for adding the extra forces is below and the error I'm getting is "AttributeError: Need to attach reboundx.Extras instance to simulation before setting params." which makes no sense because I clearly have...

# Add radiation forces
#print("adding radiation forces")
rebx = reboundx.Extras(sim)
rf = rebx.load_force("radiation_forces")
rebx.add_force(rf)
rf.params["c"] = rbxConstants.C
Q_pr = 1  # valid for meteoroid size >> wavelength of radiation
# meteoroid radius should be in m, density should be in kg/m^3
ps["Meteoroid"].params["beta"] = rebx.rad_calc_beta(
    6.6743e-11, 3.0e8, msun, lum_sol, r, rho, Q_pr
)

[dtamayo]

Hm, I just ran the command above with python 3.9.7 and I can't reproduce the error on my macbook pro. What commands did you run? Did you make a new environment? You didn't seem to install the latest versions of rebound and reboundx. Do you need those specific ones?

[tamidodo]

I did make a new environment. The problem I have is when I install the latest versions for rebound/reboundx, I don't hit the "need to attach reboundx.Extras" error but it doesn't run my simulation (gets stuck on the first sim.integrate(time) run, doesn't throw error but gets held up forever) unless I remove the lines where I've added the radiation forces, in which case it runs just fine. The versions I mentioned earlier are the ones I have in the environment locally where everything works fine so I've been trying to duplicate that environment on this new computer.

The commands I ran are below:

conda create -n tamayo-test python==3.9.7
conda activate tamayo-test
(tamayo-test)$ pip install rebound==4.3.2
Collecting rebound==4.3.2
Downloading rebound-4.3.2-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl.metadata (10 kB)
Downloading rebound-4.3.2-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (744 kB)
Installing collected packages: rebound
Successfully installed rebound-4.3.2
(tamayo-test)$ pip install reboundx --no-binary :all: --no-cache-dir
Collecting reboundx
Downloading reboundx-4.1.0.tar.gz (91 kB)
Installing build dependencies ... done
Getting requirements to build wheel ... done
Preparing metadata (pyproject.toml) ... done
Requirement already satisfied: rebound>=4.0.0 in /home/tdo47/.conda/envs/tamayo-test/lib/python3.9/site-packages (from reboundx) (4.3.2)
Building wheels for collected packages: reboundx
Building wheel for reboundx (pyproject.toml) ... done
Created wheel for reboundx: filename=reboundx-4.1.0-cp39-cp39-linux_x86_64.whl size=79758 sha256=a44d0dcdec27bac26eb71264917b81297796d9d2b52c15ed78b2151e4d6603f5
Stored in directory: /tmp/pip-ephem-wheel-cache-_yxqjj8e/wheels/89/ea/22/1f8131ed9b9d9615287b303fb5a32e1bae2162630fbfa3d180
Successfully built reboundx
Installing collected packages: reboundx
Successfully installed reboundx-4.1.0
(tamayo-test)$ python test_sim.py
Searching NASA Horizons for 'Sun'...
Found: Sun (10)
Searching NASA Horizons for 'Mercury'...
Found: Mercury Barycenter (199) (chosen from query 'Mercury')
Searching NASA Horizons for 'Venus'...
Found: Venus Barycenter (299) (chosen from query 'Venus')
Searching NASA Horizons for 'Earth'...
Found: Earth-Moon Barycenter (3) (chosen from query 'Earth')
Searching NASA Horizons for 'Luna'...
Found: Moon (301) (chosen from query 'Luna')
Searching NASA Horizons for 'Mars'...
Found: Mars Barycenter (4) (chosen from query 'Mars')
Searching NASA Horizons for 'Jupiter'...
Found: Jupiter Barycenter (5) (chosen from query 'Jupiter')
Searching NASA Horizons for 'Saturn'...
Found: Saturn Barycenter (6) (chosen from query 'Saturn')
Searching NASA Horizons for 'Uranus'...
Found: Uranus Barycenter (7) (chosen from query 'Uranus')
Searching NASA Horizons for 'Neptune'...
Found: Neptune Barycenter (8) (chosen from query 'Neptune')
Searching NASA Horizons for 'C/2014 Q2'...
Found: Lovejoy (C/2014 Q2)
/home/tdo47/.conda/envs/tamayo-test/lib/python3.9/site-packages/rebound/horizons.py:167: RuntimeWarning: Warning: Mass cannot be retrieved from NASA HORIZONS. Set to 0.
warnings.warn("Warning: Mass cannot be retrieved from NASA HORIZONS. Set to 0.", RuntimeWarning)
/home/tdo47/.conda/envs/tamayo-test/lib/python3.9/site-packages/rebound/simulation.py:254: RuntimeWarning: REBOUNDx overwrites sim->additional_forces, sim->pre_timestep_modifications and sim->post_timestep_modifications whenever forces or operators that use them get added. If you want to use REBOUNDx together with your own custom functions that use these callbacks, you should add them through REBOUNDx. See https://github.com/dtamayo/reboundx/blob/master/ipython_examples/Custom_Effects.ipynb for a tutorial.
warnings.warn(msg[1:], RuntimeWarning)
Traceback (most recent call last):
File "/home/tdo47/msc-uwo/test_sim.py", line 13, in
ps[3].params["J2"] = 1.0826157e-3
File "/home/tdo47/.conda/envs/tamayo-test/lib/python3.9/site-packages/reboundx/init.py", line 40, in params
params = Params(self)
File "/home/tdo47/.conda/envs/tamayo-test/lib/python3.9/site-packages/reboundx/params.py", line 25, in init
raise AttributeError("Need to attach reboundx.Extras instance to simulation before setting params.")
AttributeError: Need to attach reboundx.Extras instance to simulation before setting params.

And here is the code I used for the test simulation: test_sim.txt

[dtamayo]

Thanks for all the testing @tamidodo . I think the issue was compatibility issues with versions of REBOUND in the installation wheels. I think REBOUNDx 4.2.0 should resolve your issues. Could you let me know?