passagemath-topcom 10.8.1rc1

passagemath: Triangulations of point configurations and oriented matroids with TOPCOM

passagemath is open source mathematical software in Python, released under the GNU General Public Licence GPLv2+.

It is a fork of SageMath, which has been developed 2005-2025 under the motto “Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, and MATLAB”.

The passagemath fork uses the motto “Creating a Free Passage Between the Scientific Python Ecosystem and Mathematical Software Communities.” It was created in October 2024 with the following goals:

• providing modularized installation with pip,

• establishing first-class membership in the scientific Python ecosystem,

• giving clear attribution of upstream projects,

• providing independently usable Python interfaces to upstream libraries,

• offering platform portability and integration testing services to upstream projects,

• inviting collaborations with upstream projects,

• building a professional, respectful, inclusive community,

• empowering Sage users to participate in the scientific Python ecosystem by publishing packages,

• developing a port to Pyodide for serverless deployment with Javascript,

• developing a native Windows port.

Full documentation is available online.

passagemath attempts to support and provides binary wheels suitable for all major Linux distributions and recent versions of macOS.

Binary wheels for native Windows (x86_64) are are available for a subset of the passagemath distributions. Use of the full functionality of passagemath on Windows currently requires the use of Windows Subsystem for Linux (WSL) or virtualization.

The supported Python versions in the passagemath 10.6.x series are 3.10.x-3.14.x.

About this pip-installable distribution package

This pip-installable distribution passagemath-topcom provides an interface to TOPCOM, a package for computing triangulations of point configurations and oriented matroids by Jörg Rambau.

What is included

• Raw access to all executables from Python using sage.features.topcom

• The binary wheels published on PyPI include a prebuilt copy of TOPCOM.

Examples

Using TOPCOM programs on the command line:

$ pipx run --pip-args="--prefer-binary" --spec "passagemath-topcom" sage -sh -c 'cube 4 | points2facets'
Evaluating Commandline Options ...
... done.
16,5:
{
{0,1,2,3,4,5,6,7}
{0,1,2,3,8,9,10,11}
{0,1,4,5,8,9,12,13}
{0,2,4,6,8,10,12,14}
{1,3,5,7,9,11,13,15}
{2,3,6,7,10,11,14,15}
{4,5,6,7,12,13,14,15}
{8,9,10,11,12,13,14,15}
}

Finding the installation location of a TOPCOM program:

$ pipx run --pip-args="--prefer-binary" --spec "passagemath-topcom[test]" ipython

In [1]: from sage.features.topcom import TOPCOMExecutable

In [2]: TOPCOMExecutable('points2allfinetriangs').absolute_filename()
Out[2]: '/Users/mkoeppe/.local/pipx/.cache/cef1668ecbdb8cf/lib/python3.11/site-packages/sage_wheels/bin/points2allfinetriangs'

Using sage.geometry.triangulation.point_configuration:

$ pipx run --pip-args="--prefer-binary" --spec "passagemath-topcom[test]" ipython

In [1]: from passagemath_topcom import *

In [2]: p = PointConfiguration([[-1,QQ('-5/9')], [0,QQ('10/9')], [1,QQ('-5/9')], [-2,QQ('-10/9')], [0,QQ('20/9')], [2,QQ('-10/9')]])

In [3]: PointConfiguration.set_engine('topcom')

In [4]: p_regular = p.restrict_to_regular_triangulations(True)

In [5]: regular = p_regular.triangulations_list()

In [6]: len(regular)
Out[6]: 16