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#\n\n[![Language](https://img.shields.io/badge/C%2B%2B-17-blue.svg)](https://en.wikipedia.org/wiki/C%2B%2B17)\n[![License](https://img.shields.io/github/license/Daedalus451/exopy)](https://www.mozilla.org/en-US/MPL/2.0/)\n[![Build](https://img.shields.io/travis/com/Daedalus451/exopy)](https://travis-ci.org/Daedalus451/exopy)\n[![Version](https://img.shields.io/github/v/release/Daedalus451/exopy)](https://github.com/Daedalus451/exopy/releases)\n[![Python](https://img.shields.io/pypi/pyversions/exo-py)](https://pypi.org/project/exo-py/)\n[![Pypi](https://img.shields.io/pypi/v/exo-py)](https://pypi.org/project/exo-py/)\n\n**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.\n\nThe [Smoluchowski coagulation equation](https://en.wikipedia.org/wiki/Smoluchowski_coagulation_equation), as shown below, is used to compute the number of planetesimals.\n\n![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\u0026plus;%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\")\n\n## Requirements ##\n\n+ C++ 17 compiler\n  + tested on:\n    + msvc 1916/1924 (Windows 10 1909)\n    + gcc 7.4.0/8.3.0 (Ubuntu 18.04.4)\n    + clang 6.0.0/9.0.0 (Ubuntu 18.04.4)\n+ [CMake 3.11](https://cmake.org/) or newer\n+ [pybind11](https://github.com/pybind/pybind11)\n+ [span-lite](https://github.com/martinmoene/span-lite)\n+ [Python 3](https://www.python.org/)\n+ [numpy](https://numpy.org/)\n\n## Example ##\n\n### Input ###\n\n```\nimport exopy\nimport numpy as np\n\nt = np.linspace(start=0.0, stop=3.0, num=4)\nnk = exopy.compute_nk_approx(steps=t, k_max=8, initial=200.0, A=0.001)\nwith np.printoptions(precision=5, suppress=True, linewidth=100):\n  print(nk)\n```\n\n### Output ###\n\n```\n[[200.        0.        0.        0.        0.        0.        0.        0.     ]\n [160.       20.        0.        0.        0.        0.        0.        0.     ]\n [131.2      29.2       3.2       0.2       0.        0.        0.        0.     ]\n [109.70944  33.02376   6.50688   1.0134    0.11968   0.01096   0.00064   0.00002]]\n```\n\n## License ##\n\nCopyright \u0026copy; 2020 Jared Duffey - All Rights Reserved\n\n*exopy* is distributed under the [Mozilla Public License, v. 2.0](https://www.mozilla.org/en-US/MPL/2.0/). 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