.. _spkg_cddlib:

cddlib: Double description method for polyhedral representation conversion
==========================================================================

Description
-----------

The C-library cddlib is a C implementation of the Double Description
Method of Motzkin et al. for generating all vertices (i.e. extreme
points) and extreme rays of a general convex polyhedron in R^d given by
a system of linear inequalities:

   P = { x=(x1, ..., xd)^T : b - A x >= 0 }

where A is a given m x d real matrix, b is a given m-vector and 0 is the
m-vector of all zeros.

The program can be used for the reverse operation (i.e. convex hull
computation). This means that one can move back and forth between an
inequality representation and a generator (i.e. vertex and ray)
representation of a polyhedron with cdd. Also, cdd can solve a linear
programming problem, i.e. a problem of maximizing and minimizing a
linear function over P.

License
-------

GPL v2


Upstream Contact
----------------

https://github.com/cddlib/cddlib

Dependencies
------------

-  gmp (or its fork mpir)

Type
----

standard


Version Information
-------------------

package-version.txt::

    0.94j


Equivalent System Packages
--------------------------

arch:

.. CODE-BLOCK:: bash

    $ sudo pacman -S  cddlib

conda:

.. CODE-BLOCK:: bash

    $ conda install cddlib

cygwin:

.. CODE-BLOCK:: bash

    $ apt-cyg install cddlib

Debian/Ubuntu:

.. CODE-BLOCK:: bash

    $ sudo apt-get install  cddlib

Fedora/Redhat/CentOS:

.. CODE-BLOCK:: bash

    $ sudo yum install  cddlib

freebsd:

.. CODE-BLOCK:: bash

    $ sudo pkg install cddlib

gentoo:

.. CODE-BLOCK:: bash

    $ sudo emerge cddlib

nix:

.. CODE-BLOCK:: bash

    $ nix-env --install cddlib

opensuse:

.. CODE-BLOCK:: bash

    $ sudo zypper install cddlib

See https://repology.org/project/cddlib/versions

If the system package is installed, ./configure will check whether it can be used.