error handling
Using the macro __FUNC__ to define routine names;
Solves a linear system in parallel with SLES. Also
illustrates setting a user-defined shell preconditioner and using the
macro __FUNC__ to define routine names for use in error handling.
Input parameters include:
-user_defined_pc : Activate a user-defined preconditioner
using the macro __FUNC__ to define routine names;
Uses Newton-like methods to solve u'' + u^{2} = f in parallel.
This example employs a user-defined monitoring routine and optionally a user-defined
routine to check candidate iterates produced by line search routines. This code also
demonstrates use of the macro __FUNC__ to define routine names for use in error handling.