==============
Changes: 2.1.0
==============


Changes
-------
(See `Features`_ below)

.. rubric:: General:

-  Simpler interface for structured grids, see
   src/snes/examples/tutorials/ex5.c
-  "System routines" including PLog..., Options..., Viewer...,
   Draw...., FList...,OList... now all begin with the string Petsc.
   For example, PetscOptionsGetInt() and PetscLogBegin().
-  The calling sequence for PetscMalloc() was changed to return and
   error code and deliver the pointer as a new final argument. Due to
   this change, the macros CHKPTRA() and CHKPTRQ() were dropped.

.. rubric:: AO (Application Orderings):

.. rubric:: TS (Timestepping Solvers):

.. rubric:: SNES (Nonlinear Solvers):

.. rubric:: SLES (Linear Solvers):

.. rubric:: KSP (Krylov Subspace Methods):

.. rubric:: PC (Preconditioners):

.. rubric:: MAT (Matrices):

-  When using MatCreate(), you must follow with a MatSetType() or
   MatSetFromOptions() before using the matrix.
-  Changed
   ``int             MatShellSetOperation(Mat,MatOperation,void*);``
   to
   ``int             MatShellSetOperation(Mat,MatOperation,void(*)());``
-  Changed
   ``int             MatShellGetOperation(Mat,MatOperation,void**);``
   to
   ``int             MatShellGetOperation(Mat,MatOperation,void(**)());``
-  Changed IncompleteCholesky to ICC

.. rubric:: DA (Distributed Arrays):

-  Changed the DAMG routines to DMMG routines.
-  DAGetColoring() now has new second argument that takes either
   IS_COLORING_GLOBAL or IS_COLOR_GLOBAL and a new third argument
   that takes the matrix type of either MATMPIAIJ or MATMPIBAIJ.

.. rubric:: VEC (Vectors):

-  Changed ``int VecSetOperation(Vec,VecOperation,void*);`` to
   ``int VecSetOperation(Vec,VecOperation,void(*)());``

.. rubric:: IS (Index Sets):

.. rubric:: General:

.. rubric:: Draw (Graphics):

.. rubric:: Viewers:

.. rubric:: System:

.. rubric:: Error Handling:

-  CHKERRA() is now obselete; use CHKERRQ() instead. Changed the
   calling sequence of SETERRQ() to eliminate the second input
   parameter.

.. rubric:: Event Logging:

.. rubric:: Fortran Interface:


Features
--------
(See `Changes`_ above)

.. rubric:: General:

-  Simpler interface for structured grids, see
   src/snes/examples/tutorials/ex5.c
-  Complete infrastructure for parallel multigrid for linear and
   nonlinear problems on structured grids. See
   src/snes/examples/tutorials/ex19.c
-  Added manual pages for PETSc objects, enums etc.
-  Added html version of all source code and examples, accessible
   from docs/index.html and the manual pages.

.. rubric:: AO (Application Orderings):

.. rubric:: TS (Timestepping Solvers):

.. rubric:: SNES (Nonlinear Solvers):

.. rubric:: SLES (Linear Solvers):

.. rubric:: KSP (Krylov Subspace Methods):

-  Added support for "diagonal scaling" of preconditioned system as
   required by most ODE integrators via PCDiagonalScaleSet().

.. rubric:: PC (Preconditioners):

.. rubric:: MAT (Matrices):

-  Added the Henry Tufo/Paul Fischer libtfs scalable parallel direct
   solver for MPIAIJ matrices.
-  Added routine MatFDColoringSetRecompute().

.. rubric:: DA (Distributed Arrays):

-  Added DAVecGetArray() to access the multidimensional arrays
   directly in the global parallel indexing. See
   src/snes/examples/tutorials/ex5.c and ex19.c
-  Add DAGetLocalVector()/DARestoreLocalVector() for inexpensive
   access to local work vectors.

.. rubric:: VEC (Vectors):

-  Added DMComposite routines to help with PDE optimization and
   multicomponent PDEs.

.. rubric:: IS (Index Sets):

.. rubric:: PF:

.. rubric:: Draw (Graphics):

.. rubric:: Viewers:

.. rubric:: System:

.. rubric:: Error Handling:

.. rubric:: Event Logging:

.. rubric:: Fortran Interface: