  Basic ideas about noncommuting coordinates are summarized, and then
coordinate noncommutativity, as it arises in the Landau problem, is
investigated. I review a quantum solution to the Landau problem, and evaluate
the coordinate commutator in a truncated state space of Landau levels.
Restriction to the lowest Landau level reproduces the well known commutator of
planar coordinates. Inclusion of a finite number of Landau levels yields a
matrix generalization.
