Marian Piatkowski authored 11 years ago and Steffen Müthing committed 10 years ago

replaced the usual arrays for the Givens-rotation coefficients and the search directions etc. with the arrays from Dune

implemented the BLAS-routine drotg for greater robustness which was a TODO note to compute the Givens rotation

Marian Piatkowski authored 11 years ago and Steffen Müthing committed 10 years ago

removed bool recalc_defect
reimplement the update function with respect to optimality
fixed strange behaviour when maxiter is reached and GMRes wants to restart infinitely many times
fixed strange behaviour when linear reduction is reached but GMRes wants to restart and continue calculation
fixed the printing of the results

Jurgis Pods authored 11 years ago and Markus Blatt committed 11 years ago

This is essentially equivalent to Uli Sack's patch from Flyspray task FS#1202, ported to the current master.

Currently, GMRes is inconsistent when comparing current ('norm') and initial defect ('norm_0'). While the current residual is taken from the preconditioned residual, the initial defect - at least in the case the flag '_recalc_defect' is not set, which is the default - is taken from the unpreconditioned residual.

This causes the following problems:
1) The calculated reduction is wrong.
2) The solver might even exit in iteration 0 (without entering the iteration loop) because 'norm' and 'norm_0' differ by a factor greater than the requested reduction, returning a zero update 'x'.

By using the preconditioned residual in any case, the defect calculation is made consistent again.

The last commits caused compile errors for e.g. clang as I used
incomplete (only forward declared) types in template classes.
This patch moves the definition of InverseOperator and Preconditioners
from the headers solvers.hh and preconditioners into new separate
headers solver.hh and preconditioner.hh. This allows to include these
definitions in the previous headers without cause circular include directives.

Previously if the solver did not converge the number of iterations
that was printed and stored was one higher than the actual value.

Four warnings are left for two variables - I don't know what they do.

[[Imported from SVN: r1908]]

Include some other header that are used, to make headercheck
pass again.

[[Imported from SVN: r1905]]

[[Imported from SVN: r1776]]

[[Imported from SVN: r1749]]

[[Imported from SVN: r1748]]

Shouldn't subversion prevent such a thing? I even could
not use svn merge to restall the changes of r1739. 
Really weired.

[[Imported from SVN: r1747]]

[[Imported from SVN: r1746]]

[[Imported from SVN: r1743]]

This solver allows the preconditioner
to between iterations or even be nonlinear.

[[Imported from SVN: r1740]]

[[Imported from SVN: r1739]]

Removed superfluous Preconditioner.apply in GMRes, see FS#1201.

(thanks to Uli Sack for the patch)

[[Imported from SVN: r1729]]

- fix some real_type vs field_type issues
- make more solvers work with complex
(thanks to Matthias Wohlmuth)

[[Imported from SVN: r1650]]

[[Imported from SVN: r1628]]

Patch by Andreas Lauser

[[Imported from SVN: r1627]]

* use std::abs and std::sqrt instead of fabs and sqrt
* use real_type instead of double to (hopefully) fix probelms with std::complex

[[Imported from SVN: r1540]]

remove tabs from solvers.hh and fix indentation

[[Imported from SVN: r1539]]

defect of the already preconditioned rhs).

[[Imported from SVN: r1502]]

remeber default reduction when apply is called with an explicit reduction

[[Imported from SVN: r1498]]

[[Imported from SVN: r1422]]

[[Imported from SVN: r1421]]

*sigh*

[[Imported from SVN: r1410]]

[[Imported from SVN: r1404]]

[[Imported from SVN: r1357]]

[[Imported from SVN: r1356]]

[[Imported from SVN: r1350]]

RedistributeInformation.
Make redistribute more modular: 1st step is computation of sparsity
pattern. 2nd step is communication of the entries.

[[Imported from SVN: r1343]]

  might not be sufficient information
- print norm and norm_0 in GMRes

[[Imported from SVN: r1334]]

[[Imported from SVN: r1311]]

[[Imported from SVN: r1195]]

Distribute matrixmarket.hh
AMG: make x consistent even if there is only one level
galerkin.hh: Initialize Matrixblock correctly
splvers.hh: Always call pre mthod of the preconditioner _before_ using
the operator. Thus x is consistent and the computed defect will be,
too.
matrixmarket.hh: use int instead of size_t as template parameter as
this is the case for the FieldMatrix, too.

[[Imported from SVN: r1179]]

[[Imported from SVN: r1120]]

* update configure and Makefiles

[[Imported from SVN: r1100]]

        MINRES was added)

[[Imported from SVN: r1034]]

[[Imported from SVN: r965]]

Count each CG steo in BiCG with .5 and produce a more meaningful output.

[[Imported from SVN: r947]]