This directory contains a 2D and 3D black box multigrid package for solving 
potential type problems. A full description will be found in mgdesc.txt

Language: Fortran 90

mgpreset.f is a MODULE containing presets and named constants. This is part of
           both the 2D and 3D package and has to be compiled FIRST.

When compiling the rest of the source an include flag (-I) must point to the
directory where mgpreset.MOD resides, otherwise you'll end up with lots of 
undefined variables.

The 2D package is in subdirectory 2D, the 3D package in sd 3D. 

mg#f.tar.gz contains the actual multigrid routines. dfc and bicg are example
programs that show how to use the package as defect correction or Bi-Cg(Stab)
preconditioner respectively. Some extra routines needed for the programs are
provided in bicg#f.tar.gz. If the user wants to solve his own problem(s) he
himself has to provide the subroutines:

fillmat.f 

fillvec.f