petsc-3.13.6 2020-09-29
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## introduction to PETSc

- ex1.c Introductory example that illustrates printing.
- ex16.c Tests calling PetscOptionsSetValue() before PetscInitialize()
- ex17.c Demonstrates PetscGetVersonNumber().
- ex19.c Illustrates creating an options database.
- ex4.c Introductory example that illustrates running PETSc on a subset of processes.
- ex4f.F
  This introductory example illustrates running PETSc on a subset
  of processes
- ex4f90.F90
  This introductory example illustrates running PETSc on a subset
  of processes