https://github.com/daedalus451/exopy

Python module for modeling the growth of planetesimals in a disk over time built using C++ and pybind11
https://github.com/daedalus451/exopy

cpp cpp17 pybind11 python python3

Last synced: 2 months ago
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Python module for modeling the growth of planetesimals in a disk over time built using C++ and pybind11

• Host: GitHub
• URL: https://github.com/daedalus451/exopy
• Owner: Daedalus451
• License: mpl-2.0
• Created: 2020-02-05T04:57:17.000Z (over 6 years ago)
• Default Branch: develop
• Last Pushed: 2020-02-14T02:05:31.000Z (over 6 years ago)
• Last Synced: 2026-04-23T08:11:07.038Z (3 months ago)
• Topics: cpp, cpp17, pybind11, python, python3
• Language: C++
• Homepage:
• Size: 108 KB
• Stars: 0
• Watchers: 0
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.txt

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README

          
# exopy #

[![Language](https://img.shields.io/badge/C%2B%2B-17-blue.svg)](https://en.wikipedia.org/wiki/C%2B%2B17)

[![License](https://img.shields.io/github/license/Daedalus451/exopy)](https://www.mozilla.org/en-US/MPL/2.0/)

[![Build](https://img.shields.io/travis/com/Daedalus451/exopy)](https://travis-ci.org/Daedalus451/exopy)

[![Version](https://img.shields.io/github/v/release/Daedalus451/exopy)](https://github.com/Daedalus451/exopy/releases)

[![Python](https://img.shields.io/pypi/pyversions/exo-py)](https://pypi.org/project/exo-py/)

[![Pypi](https://img.shields.io/pypi/v/exo-py)](https://pypi.org/project/exo-py/)

**exopy** is a Python module for modeling the growth of planetesimals in a disk over time. It is built as a .pyd from a C++ project using pybind11.

The [Smoluchowski coagulation equation](https://en.wikipedia.org/wiki/Smoluchowski_coagulation_equation), as shown below, is used to compute the number of planetesimals.

![coagulation_equation.svg](https://latex.codecogs.com/svg.latex?%5Cfrac%7Bdn_%7Bk%7D%7D%7Bdt%7D%20%3D%20%5Cfrac%7B1%7D%7B2%7D%20%5Csum_%7Bi%20+%20j%20%3D%20k%7D%20A_%7Bij%7D%20n_%7Bi%7D%20n_%7Bj%7D%20-%20n_%7Bk%7D%20%5Csum_%7Bi%20%3D%201%7D%5E%7B%5Cinfty%7D%20A_%7Bik%7D%20n_%7Bi%7D "Coagulation Equation")

## Requirements ##

+ C++ 17 compiler

  + tested on:

    + msvc 1916/1924 (Windows 10 1909)

    + gcc 7.4.0/8.3.0 (Ubuntu 18.04.4)

    + clang 6.0.0/9.0.0 (Ubuntu 18.04.4)

+ [CMake 3.11](https://cmake.org/) or newer

+ [pybind11](https://github.com/pybind/pybind11)

+ [span-lite](https://github.com/martinmoene/span-lite)

+ [Python 3](https://www.python.org/)

+ [numpy](https://numpy.org/)

## Example ##

### Input ###

```

import exopy

import numpy as np

t = np.linspace(start=0.0, stop=3.0, num=4)

nk = exopy.compute_nk_approx(steps=t, k_max=8, initial=200.0, A=0.001)

with np.printoptions(precision=5, suppress=True, linewidth=100):

  print(nk)

```

### Output ###

```

[[200.        0.        0.        0.        0.        0.        0.        0.     ]

 [160.       20.        0.        0.        0.        0.        0.        0.     ]

 [131.2      29.2       3.2       0.2       0.        0.        0.        0.     ]

 [109.70944  33.02376   6.50688   1.0134    0.11968   0.01096   0.00064   0.00002]]

```

## License ##

Copyright © 2020 Jared Duffey - All Rights Reserved

*exopy* is distributed under the [Mozilla Public License, v. 2.0](https://www.mozilla.org/en-US/MPL/2.0/). A copy of this license is included in LICENSE.txt.