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<p><font face="Arial, Helvetica, sans-serif" size="2">The following table
lists the versions of SLEPc and shows the correspondence between SLEPc
and PETSc releases. Versions marked as major releases are those which
incorporate some new functionality. The rest are just adaptations required
for a new PETSc release and may also include bug fixes.
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<td width="138" height="25" align="center"><strong>
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SLEPc version
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<td width="175" height="25" align="center"><strong>
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PETSc versions
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<td width="75" height="25" align="center"><strong>
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Major
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<td width="146" height="25" align="center"><strong>
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Release date
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<td width="138" height="21" align="center">
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2.1.0
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<td width="175" height="21" align="center">
<font face="Arial, Helvetica, sans-serif" size="2">
2.1.0
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<td width="75" height="21" align="center"> *
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<td width="146" height="21" align="center">
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Not released
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<td width="138" height="21" align="center">
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2.1.1
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<td width="175" height="21" align="center">
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2.1.1, 2.1.2, 2.1.3
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<td width="75" height="21"></td>
<td width="146" height="21" align="center">
<font face="Arial, Helvetica, sans-serif" size="2">
Dec 2002
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<td width="138" height="21" align="center">
<font face="Arial, Helvetica, sans-serif" size="2">
2.1.5
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<td width="175" height="21" align="center">
<font face="Arial, Helvetica, sans-serif" size="2">
2.1.5, 2.1.6
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May 2003
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<td width="138" height="21" align="center">
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2.2.0
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<td width="175" height="21" align="center">
<font face="Arial, Helvetica, sans-serif" size="2">
2.2.0
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<td width="75" height="21" align="center"> *
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<td width="146" height="21" align="center">
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Apr 2004
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<td width="138" height="21" align="center">
<font face="Arial, Helvetica, sans-serif" size="2">
2.2.1
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<td width="175" height="21" align="center">
<font face="Arial, Helvetica, sans-serif" size="2">
2.2.1
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<td width="75" height="21" align="center"> *
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<td width="146" height="21" align="center">
<font face="Arial, Helvetica, sans-serif" size="2">
Aug 2004
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<td width="138" height="21" align="center">
<font face="Arial, Helvetica, sans-serif" size="2">
2.3.0
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<td width="175" height="21" align="center">
<font face="Arial, Helvetica, sans-serif" size="2">
2.3.0
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<td width="75" height="21" align="center"> *
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<td width="146" height="21" align="center">
<font face="Arial, Helvetica, sans-serif" size="2">
Jun 2005
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<tr valign="middle" bgcolor="#fff0d0">
<td width="138" height="21" align="center">
<font face="Arial, Helvetica, sans-serif" size="2">
2.3.1
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<td width="175" height="21" align="center">
<font face="Arial, Helvetica, sans-serif" size="2">
2.3.1
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<td width="75" height="21" align="center"> </td>
<td width="146" height="21" align="center">
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Mar 2006
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<td width="138" height="21" align="center">
<font face="Arial, Helvetica, sans-serif" size="2">
2.3.2
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<td width="175" height="21" align="center">
<font face="Arial, Helvetica, sans-serif" size="2">
2.3.1, 2.3.2
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<td width="75" height="21" align="center"> *
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<td width="146" height="21" align="center">
<font face="Arial, Helvetica, sans-serif" size="2">
Oct 2006
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<p>
<font size="3" face="Arial, Helvetica, sans-serif"><b>
Changes in Version 2.3.2
</font></b>
</p>
<ul>
<li><font size="2" face="Arial, Helvetica, sans-serif">
A new 'krylovschur' eigensolver has been added, that implements the
Krylov-Schur method. This method is related to the Arnoldi and Lanczos
algorithms, but incorporates a new restarting scheme that makes it
competitive with respect to implicit restart. This eigensolver is now
the default for both symmetric and non-symmetric problems.
</font></li>
<li><font size="2" face="Arial, Helvetica, sans-serif">
A new wrapper has been developed to interface with the PRIMME library.
This library provides Davidson-type eigensolvers.
</font></li>
<li><font size="2" face="Arial, Helvetica, sans-serif">
The 'lanczos' solver has been improved, in particular, the different
reorthogonalization strategies are now more robust.
</font></li>
<li><font size="2" face="Arial, Helvetica, sans-serif">
Now the 'arnoldi' eigensolver supports the computation of eigenvalues
other than those of largest magnitude.
</font></li>
<li><font size="2" face="Arial, Helvetica, sans-serif">
EPSGetLinearIterations has been replaced with EPSGetOperationCounters,
providing more statistics about the solution process.
</font></li>
<li><font size="2" face="Arial, Helvetica, sans-serif">
EPSGetIterationNumber now returns the number corresponding to outer
iterations.
</font></li>
<li><font size="2" face="Arial, Helvetica, sans-serif">
The 'lobpcg' wrapper has been renamed to 'blopex'.
</font></li>
<li><font size="2" face="Arial, Helvetica, sans-serif">
The 'planso' wrapper has been removed since PLANSO is no longer being
distributed.
</font></li>
</ul>
<p>
<font size="3" face="Arial, Helvetica, sans-serif"><b>
Changes in Version 2.3.1
</font></b>
</p>
<ul>
<li><font size="2" face="Arial, Helvetica, sans-serif">
New variant of the Arnoldi method added to the 'arnoldi' eigensolver
(with delayed reorthogonalization, see EPSArnoldiSetDelayed).
</font></li>
<li><font size="2" face="Arial, Helvetica, sans-serif">
Several optimizations for improving performance and scalability, in particular
the orthogonalization steps.
</font></li>
</ul>
<p>
<font size="3" face="Arial, Helvetica, sans-serif"><b>
Changes in Version 2.3.0
</font></b>
</p>
<ul>
<li><font size="2" face="Arial, Helvetica, sans-serif">
New 'lanczos' eigensolver, an explicitly restarted version of the Lanczos method
for symmetric eigenproblems. Allows the user to choose among 5 reorthogonalization
strategies.
</font></li>
<li><font size="2" face="Arial, Helvetica, sans-serif">
New spectrum folding spectral transformation.
</font></li>
<li><font size="2" face="Arial, Helvetica, sans-serif">
New configuration system, similar to PETSc's configure.py.
</font></li>
<li><font size="2" face="Arial, Helvetica, sans-serif">
New interface to an external eigensolver: LOBPCG implemented in Hypre.
</font></li>
<li><font size="2" face="Arial, Helvetica, sans-serif">
Added graphical convergence monitor (with -eps_xmonitor).
</font></li>
<li><font size="2" face="Arial, Helvetica, sans-serif">
Improvement of Arnoldi solver in terms of efficiency and robustness.
</font></li>
<li><font size="2" face="Arial, Helvetica, sans-serif">
Now the 'lapack' solver uses specific Lapack routines for symmetric and generalized problems.
</font></li>
<li><font size="2" face="Arial, Helvetica, sans-serif">
Bug fix in the ARPACK interface.
</font></li>
</ul>
<p><font size="2" face="Arial, Helvetica, sans-serif"><b><font size="3"><br>
Changes in Version 2.2.1
</font></b></font></p>
<ul>
<li><font size="2" face="Arial, Helvetica, sans-serif"> The 'power' eigensolver has been replaced by a simpler implementation.
</font></li>
<li><font size="2" face="Arial, Helvetica, sans-serif"> The 'rqi' eigensolver has been removed. Now the Rayleigh Quotient Iteration is embedded in the 'power' method.
</font></li>
<li><font size="2" face="Arial, Helvetica, sans-serif"> The 'subspace' eigensolver has been rewritten. Now it follows the SRRIT implementation, which is much faster than the old one.
</font></li>
<li><font size="2" face="Arial, Helvetica, sans-serif"> The 'arnoldi' eigensolver has been re-implemented as well. The new implementation is much more robust and efficient.
</font></li>
<li><font size="2" face="Arial, Helvetica, sans-serif"> A new Spectral Tranformation (ST) has been added: the generalized Cayley transform.
</font></li>
<li><font size="2" face="Arial, Helvetica, sans-serif"> Support for user-provided deflation subspaces has been added (see EPSAttachDeflationSpace).
</font></li>
<li><font size="2" face="Arial, Helvetica, sans-serif"> Support for preservation of symmetry in eigensolvers. For this feature, the user must explicitly call EPSSetProblemType in symmetric problems.
</font></li>
<li><font size="2" face="Arial, Helvetica, sans-serif"> The two types of monitors (error estimates and values) have been merged in a single one.
</font></li>
<li><font size="2" face="Arial, Helvetica, sans-serif"> New function EPSGetInvariantSubspace.
</font></li>
<li><font size="2" face="Arial, Helvetica, sans-serif"> Better support for spectrum slicing in 'blzpack'.
</font></li>
</ul>
<p><font size="2" face="Arial, Helvetica, sans-serif"><b><font size="3"><br>
Changes in Version 2.2.0
</font></b></font></p>
<ul>
<li><font size="2" face="Arial, Helvetica, sans-serif"> EPSSolve does not return the number of iterations. Use EPSGetIterationNumber for this purpose.
</font></li>
<li><font size="2" face="Arial, Helvetica, sans-serif"> EPSGetSolution has been replaced by EPSGetEigenpair with a cleaner interface.
</font></li>
<li><font size="2" face="Arial, Helvetica, sans-serif"> EPSComputeError has been replaced by EPSComputeRelativeError and EPSComputeResidualNorm with better error computing for zero eigenvalues. These functions now are oriented to single eigenpairs, as well as EPSGetErrorEstimate.
</font></li>
<li><font size="2" face="Arial, Helvetica, sans-serif"> The possibilities of EPSSetWhichEigenpairs have been reduced and now are more coherent across problem types.
</font></li>
<li><font size="2" face="Arial, Helvetica, sans-serif"> Removed STNONE spectral transformation. The default of STSHIFT with 0 shift is equivalent.
</font></li>
<li><font size="2" face="Arial, Helvetica, sans-serif"> Added STSinvertSetMatStructure to optimize performance of MatAXPY in shift-and-invert transformation.
</font></li>
<li><font size="2" face="Arial, Helvetica, sans-serif"> Classical and modified Gram-Schmidt orthogonalization use iterative refinement, with user options for parameter adjustment.
</font></li>
</ul>
<p><font size="2" face="Arial, Helvetica, sans-serif"><b><font size="3"><br>
Changes in Version 2.1.5
</font></b></font></p>
<ul>
<li><font size="2" face="Arial, Helvetica, sans-serif"> Added call to MatGetInertia
in BLZPACK interface.
</font></li>
</ul>
<p> </p>
<p><b><font size="3" face="Arial, Helvetica, sans-serif"></font></b></p>
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