- Distances between adjacent mesh points.
  blockdiags     - Create matrix with specified block diagonals.
  resetrandoms   - Reset random number generators to startup values.

<font size="4" face="Arial"><b>References</b></font>

  John R. Gilbert, Gary L. Miller, and Shang-Hua Teng.
  Geometric mesh partitioning:  Implementation and experiments.
  SIAM J. Scientific Computing 19:2091-2110, 1998.

  Tony F. Chan, John R. Gilbert, and Shang-Hua Teng.
  Geometric spectral partitioning.
  Xerox PA