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<li class="toctree-l1"><a class="reference internal" href="../overview/plex_transform_table.html">Summary of Unstructured Mesh Transformations</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../manual/dmbase.html">DM Basics</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../manual/dmplex.html">DMPlex: Unstructured Grids</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../manualpages/SPACE/index.html">Function Spaces (PetscSpace)</a></li>
<li class="toctree-l3"><a class="reference internal" href="../manualpages/DUALSPACE/index.html">Dual Spaces (PetscDualSpace)</a></li>
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<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.22/docs"> 3.22</a></li>
<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.21/docs"> 3.21</a></li>
<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.20/docs"> 3.20</a></li>
<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.19/docs"> 3.19</a></li>
<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.18/docs"> 3.18</a></li>
<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.17/docs"> 3.17</a></li>
<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.16/docs"> 3.16</a></li>
<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.15/docs"> 3.15</a></li>
<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.14/docs"> 3.14</a></li>
<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.13/docs"> 3.13</a></li>
<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.12/docs"> 3.12</a></li>
<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.11/docs"> 3.11</a></li>
<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.10/docs"> 3.10</a></li>
<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.9/docs"> 3.9</a></li>
<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.8/docs"> 3.8</a></li>
<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.7/docs"> 3.7</a></li>
<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.6/docs"> 3.6</a></li>
<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.5/docs"> 3.5</a></li>
<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.4/docs"> 3.4</a></li>
<li class="toctree-l2"><a class="reference external" href="https://web.cels.anl.gov/projects/petsc/vault/petsc-3.3/docs"> 3.3</a></li>
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<section class="tex2jax_ignore mathjax_ignore" id="changes-2-0-28">
<h1>Changes: 2.0.28<a class="headerlink" href="#changes-2-0-28" title="Link to this heading">#</a></h1>
<section id="changes">
<h2>Changes<a class="headerlink" href="#changes" title="Link to this heading">#</a></h2>
<p>(See [Features] below)</p>
<p class="rubric">General:</p>
<ul class="simple">
<li><p>No longer support PETSC_ARCH=sun4</p></li>
<li><p>The macros in petscconf.h now begin with PETSC_</p></li>
<li><p><code class="docutils notranslate"><span class="pre"><a href="../manualpages/Sys/PetscReal.html">PetscReal</a>()</span></code> and <code class="docutils notranslate"><span class="pre">PetscImaginary()</span></code> are now
<code class="docutils notranslate"><span class="pre"><a href="../manualpages/Sys/PetscRealPart.html">PetscRealPart</a>()</span></code> <code class="docutils notranslate"><span class="pre"><a href="../manualpages/Sys/PetscImaginaryPart.html">PetscImaginaryPart</a>()</span></code></p></li>
<li><p>-optionstable -> -options_table -optionsleft -> -options_left but
old left for compatibility</p></li>
</ul>
<p class="rubric">AO (Application Orderings):</p>
<p class="rubric">TS (Timestepping Solvers):</p>
<ul class="simple">
<li><p><code class="docutils notranslate"><span class="pre">TSSetMonitor()</span></code> now takes an additional final optional argument
that monitor context.</p></li>
</ul>
<p class="rubric">SNES (Nonlinear Solvers):</p>
<ul class="simple">
<li><p>SNES_EQ_LS etc changed to drop _, for example SNESEQLS</p></li>
<li><p>Changed calling sequence of SNES monitoring routines to add an
additional output parameter indicating why it converged or
diverged.</p></li>
<li><p>Added additional final argument to <code class="docutils notranslate"><span class="pre">SNESSetMonitor()</span></code> an
optional destroy routine for the monitor context.</p></li>
<li><p>Changed calling sequence of <code class="docutils notranslate"><span class="pre">MatSNESMFAddNullSpace()</span></code> to take
<code class="docutils notranslate"><span class="pre">PCNullSpace</span></code> object rather than array of vectors.</p></li>
<li><p>Added final ctx argument to <code class="docutils notranslate"><span class="pre"><a href="../manualpages/SNES/SNESGetFunction.html">SNESGetFunction</a>()</span></code>,
<code class="docutils notranslate"><span class="pre">SNESGetGradient()</span></code> and <code class="docutils notranslate"><span class="pre">SNESGetMinimizationFunction()</span></code></p></li>
</ul>
<p class="rubric">SLES (Linear Solvers):</p>
<ul class="simple">
<li><p>See PC and KSP</p></li>
<li><p><code class="docutils notranslate"><span class="pre">SLESSolveTrans()</span></code> is now <code class="docutils notranslate"><span class="pre">SLESSolveTranspose()</span></code></p></li>
<li><p><code class="docutils notranslate"><span class="pre">SLESSolve()</span></code> now ALWAYS returns a 0 or positive iteration
count. Call <code class="docutils notranslate"><span class="pre"><a href="../manualpages/KSP/KSPGetConvergedReason.html">KSPGetConvergedReason</a>()</span></code> to see if converged or
diverged and why.</p></li>
</ul>
<p class="rubric">KSP (Krylov Subspace Methods):</p>
<ul class="simple">
<li><p>Added additional final argument to <code class="docutils notranslate"><span class="pre">KSPSetMonitor()</span></code> an optional
destroy routine for the monitor context.</p></li>
<li><p><code class="docutils notranslate"><span class="pre">KSPSolvetrans()</span></code> is now <code class="docutils notranslate"><span class="pre"><a href="../manualpages/KSP/KSPSolveTranspose.html">KSPSolveTranspose</a>()</span></code></p></li>
<li><p>Added flexible gmres (use fgmres or KSPFGMRES as the type) see
<code class="docutils notranslate"><span class="pre"><a href="../manualpages/KSP/KSPFGMRESSetModifyPC.html">KSPFGMRESSetModifyPC</a>()</span></code> for one way to change PC at each
iteration.</p></li>
</ul>
<p class="rubric">PC (Preconditioners):</p>
<ul class="simple">
<li><p><code class="docutils notranslate"><span class="pre">MGSetRestriction()</span></code> and <code class="docutils notranslate"><span class="pre">MGSetInterpolation()</span></code> now accept
PETSc figures out which one it is based on the number of rows and
columns. Now you don’t need to use the Shell matrices if you
computed it “the other way then PETSc use to expect”.</p></li>
<li><p><code class="docutils notranslate"><span class="pre">PCApplyTrans()</span></code> is now <code class="docutils notranslate"><span class="pre"><a href="../manualpages/PC/PCApplyTranspose.html">PCApplyTranspose</a>()</span></code></p></li>
<li><p>options -pc_ilu_mat_ordering_type <nd,…> and
-pc_lu_mat_ordering_type <nd,…> now set the ordering type.</p></li>
</ul>
<p class="rubric">MAT (Matrices):</p>
<ul class="simple">
<li><p>Added two additional arguments to
<code class="docutils notranslate"><span class="pre"><a href="../manualpages/Mat/MatCreate.html">MatCreate</a>(<a href="../manualpages/Sys/MPI_Comm.html">MPI_Comm</a></span> <span class="pre">comm,int</span>             <span class="pre">m,int</span> <span class="pre">n,int</span> <span class="pre">M,int</span> <span class="pre">N,<a href="../manualpages/Mat/Mat.html">Mat</a></span> <span class="pre">*)</span></code>
where m and n are the local ownership sizes. To get the effect of
the old <code class="docutils notranslate"><span class="pre"><a href="../manualpages/Mat/MatCreate.html">MatCreate</a>()</span></code> use m and n equal to PETSC_DECIDE</p></li>
<li><p>Changed <code class="docutils notranslate"><span class="pre">MatSetLocalToGlobalMappingBlocked()</span></code> to
<code class="docutils notranslate"><span class="pre">MatSetLocalToGlobalMappingBlock()</span></code> so that it would be less
then 32 characters long.</p></li>
<li><p><code class="docutils notranslate"><span class="pre">MatSolveTrans()</span></code>and <code class="docutils notranslate"><span class="pre">MatSolveTransAdd()</span></code> are now
<code class="docutils notranslate"><span class="pre">MatSolveTransposeXXX()</span></code> <code class="docutils notranslate"><span class="pre">MatMultTrans()</span></code> and
<code class="docutils notranslate"><span class="pre">MatMultTransAdd()</span></code>are now <code class="docutils notranslate"><span class="pre">MatMultTransposeXXX()</span></code></p></li>
<li><p><code class="docutils notranslate"><span class="pre"><a href="../manualpages/Mat/MatCreateMPIAdj.html">MatCreateMPIAdj</a>()</span></code> changed to <code class="docutils notranslate"><span class="pre">MatCreateMPICSR()</span></code>;
<code class="docutils notranslate"><span class="pre">MatCreateSeqAdj()</span></code> dropped.</p></li>
<li><p>Another <code class="docutils notranslate"><span class="pre"><a href="../manualpages/Mat/MatSetOption.html">MatSetOption</a>()</span></code>, <code class="docutils notranslate"><span class="pre"><a href="../manualpages/Mat/MatOption.html">MAT_IGNORE_ZERO_ENTRIES</a></span></code> for AIJ
matrices with <code class="docutils notranslate"><span class="pre"><a href="../manualpages/Sys/ADD_VALUES.html">ADD_VALUES</a></span></code>.</p></li>
<li><p>added matrix option <code class="docutils notranslate"><span class="pre">MAT_KEEP_ZEROED_ROWS</span></code> causes
<code class="docutils notranslate"><span class="pre"><a href="../manualpages/Mat/MatZeroRows.html">MatZeroRows</a>()</span></code> to keep the original nonzero data structure and
just put 0.0 into the elements that are to be zeroed. Without this
option it removes the locations from the nonzero structure.</p></li>
</ul>
<p class="rubric">DA (Distributed Arrays):</p>
<p class="rubric">VEC (Vectors):</p>
<ul class="simple">
<li><p>Added VecGetArray2d() and VecRestoreArray2d()</p></li>
</ul>
<p class="rubric">IS (Index Sets):</p>
<ul class="simple">
<li><p>Added second argument to <code class="docutils notranslate"><span class="pre"><a href="../manualpages/IS/ISInvertPermutation.html">ISInvertPermutation</a></span></code>() that
indicates how many indices are to be stored on that processor;
ignored for one processor code. If you use
<code class="docutils notranslate"><span class="pre"><a href="../manualpages/IS/ISInvertPermutation.html">ISInvertPermutation</a></span></code>() simply add a second argument of
<code class="docutils notranslate"><span class="pre"><a href="../manualpages/Sys/PETSC_DECIDE.html">PETSC_DECIDE</a></span></code>.</p></li>
</ul>
<p class="rubric">Draw (Graphics):</p>
<ul class="simple">
<li><p>DrawHistxxx changed to DrawHGxxx</p></li>
</ul>
<p class="rubric">Viewers:</p>
<p class="rubric">System:</p>
<ul class="simple">
<li><p>Routines XXXRegister() are now XXXRegisterDynamic() used for
registering new object types in dynamic libraries and
XXXRegister_Private() is now XXXRegister() used to register new
object types whose definitions are in the exectuable.</p></li>
<li><p>The final argument to OptionsHasName() and OptionsGetXXX() is a
PetscTruth * instead of an int*</p></li>
<li><p>PETSc functions and objects that began with Table now begin with
PetscTable</p></li>
<li><p>Changed these routines to return an error code. extern int
PetscStrchr(const char[],char,char **); extern int
PetscStrrchr(const char[],char,char **); extern int
PetscStrstr(const char[],const char[],char **); extern int
PetscStrtok(const char[],const char[],char **); extern int
PetscStrlen(const char[],int *); added PetscStrallocpy(const
char[],char **); PetscStrncmp() and PetscStrcasecmp() now return
PETSC_TRUE as a final argument if the strings match else
PETSC_FALSE. Note this means removing ! from your current tests
and adding it where you don’t have it.</p></li>
<li><p>PetscMemcmp() now has a final argument of true for matching
memories.</p></li>
<li><p>The Fortran versions of the PetscStrxxx() and PetscMemxxx()
routines also now have the error flag as the final argument</p></li>
<li><p>PetscFree() now always returns an error code that may be checked
with CHKERRQ(). On systems where free() returns a void (and the
user has no access to an error condition in free(), PetscFree()
returns 0 i.e. no error; on other systems it returns the error
number from free.</p></li>
<li><p>The BT bitarray macros are now prefixed with PetscBT</p></li>
</ul>
<p class="rubric">Error Handling:</p>
<p class="rubric">Event Logging:</p>
<p class="rubric">Fortran Interface:</p>
</section>
<section id="features">
<h2>Features<a class="headerlink" href="#features" title="Link to this heading">#</a></h2>
<p>(See [Changes] above)</p>
<p class="rubric">General:</p>
<ul class="simple">
<li><p>When doing string substitutions in library directory paths etc one
must use ${PETSC_DIR} ${BOPT} etc now instead of $PETSC_DIR etc.
Also you can put anything in {anything} as long as it is an
environmental variable or passed in the options database with
-anything</p></li>
<li><p>Added PetscEmacsclientErrorHandler() -on_error_emacs [machinename]
to allow emacs to jump to error; can be used with any other error
handler.</p></li>
<li><p>So long as you have defined the macro __FUNC__ “main” before
your main C/C++ subroutine you can use SETERRQ() and CHKERRQ()
instead of SETERRA(), CHKERRA().</p></li>
</ul>
<p class="rubric">AO (Application Orderings):</p>
<p class="rubric">TS (Timestepping Solvers):</p>
<p class="rubric">SNES (Nonlinear Solvers):</p>
<ul class="simple">
<li><p>Added <code class="docutils notranslate"><span class="pre">SNESSetLineSearchParams()</span></code> and
<code class="docutils notranslate"><span class="pre">SNESGetLineSearchParams()</span></code>, contributed by Matt Knepley.</p></li>
<li><p>Added <code class="docutils notranslate"><span class="pre"><a href="../manualpages/SNES/SNESGetConvergedReason.html">SNESGetConvergedReason</a>()</span></code> to find out if a
<code class="docutils notranslate"><span class="pre"><a href="../manualpages/SNES/SNESSolve.html">SNESSolve</a>()</span></code> has converged/diverged and why</p></li>
<li><p>Added <code class="docutils notranslate"><span class="pre">SNESMonitorVecUpdate()</span></code> and -snes_vecmonitor_update to
display the Newton update at each iteration.</p></li>
</ul>
<p class="rubric">SLES (Linear Solvers):</p>
<ul class="simple">
<li><p>See PC and KSP</p></li>
</ul>
<p class="rubric">KSP (Krylov Subspace Methods):</p>
<ul class="simple">
<li><p>Added -ksp_gmres_krylov_monitor and <code class="docutils notranslate"><span class="pre">KSPGMRESKrylovMonitor()</span></code> to
allow one to view the vectors in the Krylov space.</p></li>
</ul>
<p class="rubric">PC (Preconditioners):</p>
<ul class="simple">
<li><p>We now provide a drop tolerance based ILU for SeqAIJ matrix format
via Yousef Saad’s SPARSEKIT2 software. Use
-pc_ilu_use_drop_tolerance <dt,dtcol,rowmax> or
<code class="docutils notranslate"><span class="pre">PCILUSetUseDropTolerance</span></code>(pc,dt,dtcol,rowmax).</p></li>
</ul>
<p class="rubric">MAT (Matrices):</p>
<p class="rubric">DA (Distributed Arrays):</p>
<p class="rubric">VEC (Vectors):</p>
<p class="rubric">IS (Index Sets):</p>
<p class="rubric">Draw (Graphics):</p>
<ul class="simple">
<li><p><code class="docutils notranslate"><span class="pre">DrawCreate()</span></code> and <code class="docutils notranslate"><span class="pre">DrawOpenX()</span></code> now can take</p></li>
</ul>
<p class="rubric">Viewers:</p>
<ul class="simple">
<li><p>Added <code class="docutils notranslate"><span class="pre">ViewerASCIIUseTabs()</span></code> to allow turning off tabbing during
certain viewer operations.</p></li>
<li><p>Added <code class="docutils notranslate"><span class="pre">ViewerGetSingleton()</span></code>, ViewerRestoreSingleton() to allow
managing the calling of a sequential viewer from within a parallel
viewer.</p></li>
<li><p>Added <code class="docutils notranslate"><span class="pre">ViewerASCIISynchronizedPrintf</span></code>(viewer,….)</p></li>
<li><p>Binary and ASCII viewers can create compressed files by simply
appending a .gz on the filename.</p></li>
<li><p>PETSc now has a new viewer that generates rudimentary Postscript.
Improvements, additions may be added as needed. <code class="docutils notranslate"><span class="pre">DrawOpenPS()</span></code>,
or <code class="docutils notranslate"><span class="pre">DrawSetType(,DRAW_PS);</span></code> or -draw_type ps</p></li>
</ul>
<p class="rubric">System:</p>
<ul class="simple">
<li><p>using -trdump with PETSC_USE_STACK compile option (default for
BOPT=g*) will print the entire stack for each malloc, allow one to
more easily track down where mallocs where made that where not
freed.</p></li>
<li><p>Added PetscSum_Op to replace MPI_SUM for reductions with
MPIU_SCALAR</p></li>
<li><p>Added PetscMaxSum_Op to do max on first half of entries and sum on
second half.</p></li>
<li><p>Added CHKMEMQ and CHKMEMA macros to help track down memory
corruption.</p></li>
</ul>
<p class="rubric">Error Handling:</p>
<p class="rubric">Event Logging:</p>
<p class="rubric">Fortran Interface:</p>
<ul class="simple">
<li><p>Added Fortran 90 interface support for HP Convex and
Solaris.machine.</p></li>
</ul>
</section>
</section>
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