nbody-iv-conditioner

A N-body initial values conditioner. Given state vectors and desired first integrals, this lib conditionates these state vectors to obtain these first integrals (as long as it's physically possible).

The theory behind all this thing is in the documentation.

Python interface

The python interface is available on a PyPI repository and to install it just run

pip install nbody-iv-conditioner

The interface is almost the same as the Fortran, and it have two big classes: Utils and Conditioners. Although the modules are available too, the parameters needs to be in Fortran format in many functions (because in Fortran they may be subroutines with intent(inout)), and using the classes Utils and Conditioners all the functions have the automatic conversor.

import nbody_iv_conditioner as nivc
import numpy as np

N = 10
ms = np.ones(N)/N
qs = 2.0 * np.random.random((3,N)) - 1.0

# move the com to origin
ms, qs, ps = nivc.Conditioners.comori(ms, qs)

com = nivc.Utils.center_of_mass(ms, qs)

Fortran interface

To compile the Fortran interface, just go the directory fortran and run

make lib

It's possible to change the directory where the library goes. The default is /lib (at the root of this directory). To change, just use the parameter INSTALL_DIR.

To link the compiled library to your script if you installed it on the directory "/abobrinha", just add the flags to your gfortran command:

-I/abobrinha -L/abobrinha -lconditioners_mod -lutils

Example:

gfortran -o my_program my_script.f90 -I/abobrinha -L/abobrinha -lconditioners_mod -lutils

To use the subroutines, just import the modules:

use conditioners_mod
use utils_mod

Tests/examples

There are some tests to guarantee that all the things works. To run it:

make test
./test

Key dates

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Credits

Author: potalej

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