==============
Changes: 2.1.1
==============


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

.. rubric:: General:

-  Scalar -> PetscScalar (and added PetscReal)
-  The make files are reorganized. bmake/${PETSC_ARCH}/base_variables
   -> variables, and base.site -> packages. base ->rules.
-  If using makefiles from earlier version of PETSc, change

   -  ``include ${PETSC_DIR}/bmake/${PETSC_ARCH}/base``

   to

   -  ``include ${PETSC_DIR}/conf/base``

-  The Microsoft Windows build of PETSc with win32_gnu, win32_intel and
   win32_mpich now default to using MPICH-1.2.3The complex version of
   the PETSc libraries can only be installed with C++ compilers that
   provide the std::complex implementation.

.. rubric:: AO (Application Orderings):

.. rubric:: TS (Timestepping Solvers):

.. rubric:: DMMG

-  Default Krylov method on outer linear solver is now FGMRES instead
   of GMRES. Also default multigrid type is now full instead of
   multiplicative

.. rubric:: SNES (Nonlinear Solvers):

.. rubric:: SLES (Linear Solvers):

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

-  All KSP methods with left preconditioning use the preconditioned
   residual by default (before CG, CR used the unpreconditioned
   residual). Use -ksp_norm_type
   <none,preconditioned,unpreconditioned,natural> to change it, see
   next bullet.
-  ``KSPSetInitialGuessNonzero(), KSPSetComputeSingularValues(), KSPSetComputeEigenvalues(),``
   all now take a PetscTruth as the second argument allowing them to
   each be toggled on or off
-  ``KSPSetAvoidNorms(), KSPSetUseUnpreconditionedResidual(),             KSPSetComputeResidual()``
   have all been merged into ``KSPSetNormType()``

.. rubric:: PC (Preconditioners):

.. rubric:: MAT (Matrices):

-  Added additional local relaxation argument to ``MatRelax()``
-  Added additional argument to ``MatAXPY()``

   -  MatSNESMFFormJacobian() has been renamed to
      MatSNESMFComputeJacobian()
   -  added another field to MatLUInfo and MatILUInfo
   -  MatCreate() now requires a call to MatSetType() or
      MatSetFromOptions()
   -  The MatType is assigned in either of these calls.

.. rubric:: DA (Distributed Arrays):

In order to set the grid sizes with -da_grid_x, -da_grid_y,
-da_grid_z one must pass in negative values for the M, N, and P
arguments in the call to DACreateXX(). If values are not set from the
options database then the absolute value of the M,N,P is used as the
default.

-  Changed DAGetColoring() to two routines, DAGetColoring() and
   DAGetMatrix()

.. rubric:: VEC (Vectors):

-  Changed VecCreate() to no longer take in size arguments. Use
   VecCreate() & VecSetSizes()

.. rubric:: IS (Index Sets):

-  Changed IS_COLORING_LOCAL to IS_COLORING_GHOSTED and
   IS_COLORING_GLOBAL to IS_COLORING_LOCAL

.. rubric:: General:

``PetscOptionsGetDouble()`` is now ``PetscOptionsGetReal()``
.. rubric:: Draw (Graphics):

.. rubric:: Viewers:

.. rubric:: System:

.. rubric:: Error Handling:

.. rubric:: Event Logging:

Logging functionality is completely reworked. Now one can register
new stages, classes and events. Every event is associated with a
class. So, users would have to create a class for all userevents.

-  ``PetscLogStageRegister()`` now takes an int \* as the first
   argument
-  ``PetscLogEventRegister()`` takes an int as the third argument,
   not a char \*

.. rubric:: Fortran Interface:


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

.. rubric:: General:

-  configure can now be used to build PETSc on some architectures.
   Currently tested on Linux, IRIX, Solaris machines.We'd like your
   feedback on this feature; please send ``configure_petsc.log`` and
   ``config.log``\ when reporting problems with configure.
-  Added support for ESI vectors and matrices. Use BOPT=g_c++ or
   O_c++Better
-  support for automatic differentiation with ADIC

.. rubric:: AO (Application Orderings):

.. rubric:: TS (Timestepping Solvers):

.. rubric:: SNES (Nonlinear Solvers):

.. rubric:: SLES (Linear Solvers):

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

.. rubric:: PC (Preconditioners):

-  added -pc_lu_zeropivot and -pc_ilu_zeropivot (still need function
   interfaces)

.. rubric:: MAT (Matrices):

.. rubric:: DA (Distributed Arrays):

Added DAGetArray() and DARestoreArray() that give workspace
appropriate for a local function. These may be used in routines that
diverentiated with ADIC:-)
.. rubric:: VEC (Vectors):

-  Added the utility routines which do special cases of vecscatters
   VecConvertMPIToSeqAll(),VecConvertMPIToMPIZero()

.. rubric:: IS (Index Sets):

.. rubric:: PF:

.. rubric:: Draw (Graphics):

-  added DrawEllipse()

.. rubric:: Viewers:

-  added PetscViewerASCIISetMode()

.. rubric:: System:

.. rubric:: Error Handling:

.. rubric:: Event Logging:

.. rubric:: Fortran Interface: