SOFTWARE

PLTMG 10.0 Download PLTMG 10.0

PLTMG 10.0 is a package for solving elliptic partial differential equations in general regions of the plane. It is based on continuous piecewise polynomial triangular finite elements (linear, quadratic or cubic), and features adaptive local mesh refinement, multigraph iteration, and pseudo-arclength continuation options for parameter dependencies. It also provides options for solving several classes of optimal control and obstacle problems. The package includes an initial mesh generator and several graphics packages. Support for the Bank-Holst parallel adaptive meshing strategy is also provided.

PLTMG is provided as Fortran (and a little C) source code, in both single and double precision versions. The code has interfaces to X-Windows, MPI, and Michael Holst's OpenGL image viewer SG. The X-Windows, MPI, and SG interfaces require libraries that are NOT provided as part of the PLTMG package.

PLTMG is also available from Netlib and Mgnet.

The SG (socket graphics) OpenGL display tool is available from Michael Holst.

MPICH is available from the MPI homepage.

OpenMotif is available from the MotifZone homepage.

Multigraph 1.0 Download Multigraph 1.0 Download Matrix Files 1 Download Matrix Files 3

Multigraph 1.0 is an algebraic multilevel solver for large sparse systems of linear equations. The package takes as input just the system matrix in a sparse matrix format and constructs a hierarchy of coarse matrices based on the sparse matrix graph. The multigraph solver is included in the PLTMG 9.0 package. The Multigraph 1.0 distribution contains the basic solver routines that can be incorporated into user applications, and a driver program with an X-Windows GUI and graphics package that can be used independently to demonstrate and test the solver.

The directory Matrix 1 contains 18 sparse linear system files corresponding to 6 elliptic PDEs on irregular regions with nonuniform adaptive meshes. The directory Matrix 3 contains 21 sparse linear system files corresponding to 7 constant coefficient PDEs on uniform square meshes. In both directories, each PDE appears for 3 different values of N.