petsc-3.12.4 2020-02-04
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## introduction to PETSc

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