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<h1> Docs: Changes: 2.1</h1>
<p align="center"><font color="#FF0000" size="5"><a
name="CHANGES">CHANGES</a> in PETSc 2.1 (see new <a href="#Features">features</a>)</font></p>
<p><font size="4"><strong><u>General:</u></strong></font>
<p>Simpler interface for structured grids, see src/snes/examples/tutorials/ex5.c
<p>"System routines" including PLog..., Options..., Viewer...,
Draw...., FList...,OList... now all begin with the string Petsc.<strong> </strong>For
example, PetscOptionsGetInt() and PetscLogBegin().<p>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.
<p><font size="4"><strong><u>AO (Application Orderings):</u></strong></font></p>
<p><font size="4"><strong><u>TS (Timestepping Solvers):</u></strong></font>
<p><font size="4"><strong><u>SNES (Nonlinear Solvers): </u></strong></font>
<p><font size="4"><strong><u>SLES (Linear Solvers):</u></strong></font>
<p><font size="4"><strong><u>KSP (Krylov Subspace Methods):</u></strong></font>
<p><font size="4"><strong><u>PC (Preconditioners): </u></strong></font>
<br>
<p><font size="4"><strong><u>MAT (Matrices): </u></strong></font>
<p>When using MatCreate(), you must follow with a MatSetType() or
MatSetFromOptions() before using the matrix.
<p>Changed int MatShellSetOperation(Mat,MatOperation,void*);<br>
to int MatShellSetOperation(Mat,MatOperation,void(*)());<br>
<br>
Changed int MatShellGetOperation(Mat,MatOperation,void**);<br>
to int MatShellGetOperation(Mat,MatOperation,void(**)());
<p>Changed IncompleteCholesky to ICC
<p><font size="4"><strong><u>DA (Distributed Arrays): </u></strong></font>
<p>Changed the DAMG routines to DMMG routines.
<p>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.
<p><u><strong><font size="4">VEC (Vectors):<br>
</font></strong></u>Changed int VecSetOperation(Vec,VecOperation,void*);<br>
to int VecSetOperation(Vec,VecOperation,void(*)());<br>
<font size="4"><strong><u><br>
IS (Index Sets): </u></strong></font>
<p><font size="4"><strong><u>General:</u></strong></font>
<p><font size="4"><strong><u>Draw (Graphics):</u></strong></font>
<p><font size="4"><strong><u>Viewers: </u></strong></font>
<p><font size="4"><strong><u>System:</u></strong></font>
<p><font size="4"><strong><u>Error Handling:</u></strong></font></p>
<p>CHKERRA() is now obselete; use CHKERRQ() instead.<p>Changed the calling
sequence of SETERRQ() to eliminate the second input parameter.
<p><font size="4"><strong><u>Event Logging:</u></strong></font></p>
<p><font size="4"><strong><u>Fortran Interface:</u></strong></font> </p>
<p> </p>
<p align="center"><font color="#FF0000" size="5">New <a name="Features">Features</a> in
PETSc 2.1 (see <a href="#CHANGES">changes</a> above)</font></p>
<p><font size="4"><strong><u>General:</u></strong></font>
<p>Simpler interface for structured grids, see src/snes/examples/tutorials/ex5.c
<p>Complete infrastructure for parallel multigrid for linear and nonlinear
problems on structured grids. See src/snes/examples/tutorials/ex19.c
<p>Added manual pages for PETSc objects, enums etc.<p>Added html version of
all source code and examples, accessable from docs/index.html and the manual
pages.
<p><font size="4"><strong><u>AO (Application Orderings):</u></strong></font>
<p><font size="4"><strong><u>TS (Timestepping Solvers):</u></strong></font>
<p><font size="4"><strong><u>SNES (Nonlinear Solvers): </u></strong></font>
<p><font size="4"><strong><u>SLES (Linear Solvers):</u></strong></font>
<p><font size="4"><strong><u>KSP (Krylov Subspace Methods):</u></strong></font>
<p>Added support for "diagonal scaling" of preconditioned system
as required by most ODE integrators via PCDiagonalScaleSet().
<p><font size="4"><strong><u>PC (Preconditioners): </u></strong></font>
<p><font size="4"><strong><u>MAT (Matrices): </u></strong></font>
<p>Added the Henry Tufo/Paul Fischer libtfs scalable parallel direct solver
for MPIAIJ matrices.
<p>Added routine MatFDColoringSetRecompute().
<p><font size="4"><strong><u>DA (Distributed Arrays): </u></strong></font>
<p>Added DAVecGetArray() to access the multidimensional arrays directly in
the global parallel indexing. See src/snes/examples/tutorials/ex5.c and
ex19.c<p>Add DAGetLocalVector()/DARestoreLocalVector() for inexpensive
access to local work vectors.
<p><font size="4"><strong><u>VEC (Vectors):</u></strong></font>
<p>Added VecPack routines to help with PDE optimization and multicomponent
PDEs.
<p><font size="4"><strong><u>IS (Index Sets): </u></strong></font>
<p><font size="4"><strong><u>PF:</u></strong></font>
<p><font size="4"><strong><u>Draw (Graphics):</u></strong></font>
<p><font size="4"><strong><u>Viewers: </u></strong></font>
<p><font size="4"><strong><u>System:</u></strong></font>
<p><font size="4"><strong><u>Error Handling:</u></strong></font></p>
<p><font size="4"><strong><u>Event Logging:</u></strong></font></p>
<p><font size="4"><strong><u>Fortran Interface:</u></strong></font>
<p><br>
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