CS-99-27
The Making of a Geometric Algebra Package in Matlab
Stephen Mann, Leo Dorst, and Tim Bouma

Abstract:
  In this paper, we describe our development of GABLE, a Matlab
  implementation of the Geometric Algebra based on cl_{p,q} 
  (where p+q=3) and intended for tutorial purposes.  Of particular 
  note are the matrix representation of geometric objects, effective
  algorithms for this geometry (inversion, Meet and Join), and issues 
  in efficiency and numerics.