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VERSION (5, 2023-11-14)
check_add_col_untyped_args.pyx (166, 2023-11-14)
check_get_solver_with_name.py (483, 2023-11-14)
check_sage_testsuite.py (1562, 2023-11-14)
environment.yml (531, 2023-11-14)
patch_and_check.sh (420, 2023-11-14)
patch_into_sage_module.py (362, 2023-11-14)
sage_numerical_backends_coin/ (0, 2023-11-14)
sage_numerical_backends_coin/__init__.py (20, 2023-11-14)
sage_numerical_backends_coin/coin_backend.pxd (7214, 2023-11-14)
sage_numerical_backends_coin/coin_backend.pyx (59125, 2023-11-14)
setup.py (5712, 2023-11-14)
tox.ini (1552, 2023-11-14)

# sage-numerical-backends-coin: COIN-OR mixed integer linear programming backend for SageMath [](https://pypi.org/project/sage-numerical-backends-coin/ "PyPI: sage-numerical-backends-coin") [](https://github.com/mkoeppe/sage-numerical-backends-coin/actions "GitHub Actions: sage-numerical-backends-coin") `CoinBackend` has previously been available as part of the [SageMath](http://www.sagemath.org/) source tree, from which it is built as an "optional extension" when the `cbc` Sage package is installed. However, it is not available in binary distributions such as: - the Sage binary distribution (which does not package any optional packages), - homebrew (which just uses the Sage binary distribution), - Ubuntu (bionic 18.04LTS and several newer versions ship versions of SageMath, with various optional packages including CBC, but not the optional extension module CoinBackend), - conda-forge (which ships SageMath and CBC but not the optional extension). - Fedora The present standalone Python package `sage-numerical-backends-coin` has been created from the SageMath sources, version 9.0.beta10. It can be installed on top of various Sage installations using pip, including all of the above, including older versions of Sage such as 8.1 (as shipped by Ubuntu bionic 18.04LTS). Sage ticket https://trac.sagemath.org/ticket/28175 uses this package to remove the in-tree version of `CoinBackend`. ## Installation CBC can either be installed using its Sage package using $ sage -i cbc or any of the methods explained at https://github.com/coin-or/Cbc . This package finds the CBC installation by means of ``pkgconfig``. Install this package from PyPI using $ sage -python -m pip install sage-numerical-backends-coin or from GitHub using $ sage -python -m pip install git+https://github.com/mkoeppe/sage-numerical-backends-coin (See [`.github/workflows/build.yml`](.github/workflows/build.yml) for details about package prerequisites on various systems.) ## Using this package To obtain a solver (backend) instance: sage: from sage_numerical_backends_coin.coin_backend import CoinBackend sage: CoinBackend() Equivalently: sage: from sage_numerical_backends_coin.coin_backend import CoinBackend sage: from sage.numerical.backends.generic_backend import get_solver sage: get_solver(solver=CoinBackend) To use this solver (backend) with [`MixedIntegerLinearProgram`](http://doc.sagemath.org/html/en/reference/numerical/sage/numerical/mip.html): sage: from sage_numerical_backends_coin.coin_backend import CoinBackend sage: M = MixedIntegerLinearProgram(solver=CoinBackend) sage: M.get_backend() To make it available as the solver named `'Coin'`, we need to make the new module known as `sage.numerical.backends.coin_backend` (note dots, not underscores), using the following commands: sage: import sage_numerical_backends_coin.coin_backend as coin_backend, sage.numerical.backends as backends, sys sage: sys.modules['sage.numerical.backends.coin_backend'] = backends.coin_backend = coin_backend If these commands are executed in a Sage session before any `MixedIntegerLinearProgram` is created, then the new `'Coin'` solver wins over the `'GLPK'` solver in the selection of the default MIP backend. To select the `'Coin'` solver explicitly as the default MIP backend, additionally use the following command. sage: default_mip_solver('Coin') To make these settings permanent, add the above 2 + 1 commands to your `~/.sage/init.sage` file. Note that this setting will not affect doctesting (`sage -t`) because this file is ignored in doctesting mode. ## Running doctests To run the (limited) testsuite of this package, use: $ sage setup.py test To run the Sage testsuite with the default MIP solver set to the backend provided by this package, use: $ sage setup.py check_sage_testsuite ## Running tests with tox The doctests can also be invoked using `tox`: $ tox -e local $ tox -e local-sage_testsuite If you have `docker` installed, more tests can be run: $ tox -e docker-sage_binary-cbc_coinbrew See `tox.ini` for the available options. ## Overriding the default solver by patching the Sage installation Another method is to patch the module in permanently to the sage installation (at your own risk). This method will affect doctesting. $ sage -c 'import os; import sage.numerical.backends as dm; import sage_numerical_backends_coin.coin_backend as sm; s = sm.__file__; f = os.path.basename(s); d = os.path.join(dm.__path__[0], f); (os.path.exists(d) or os.path.lexists(d)) and os.remove(d); os.symlink(s, d);' Or use the script [`patch_into_sage_module.py`](patch_into_sage_module.py) in the source distribution that does the same: $ sage -c 'load("patch_into_sage_module.py")' Success: Patched in the module as sage.numerical.backends.coin_backend Verify with [`check_get_solver_with_name.py`](check_get_solver_with_name.py) that the patching script has worked: $ sage -c 'load("check_get_solver_with_name.py")' Success: get_solver(solver='coin') gives

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