CVS info   : $Header$

Cactus Code Thorn SummationByParts
Thorn Author(s)     : Peter Diener <diener@cct.lsu.edu>
Thorn Maintainer(s) : Peter Diener <diener@cct.lsu.edu>
--------------------------------------------------------------------------

Purpose of the thorn:

Calculate derivates of grid functions using finite difference stencils
that satisfy summation by parts.