From 6ece0117827a7e4b784e5b0f2aa6cdc2cbb61ea4 Mon Sep 17 00:00:00 2001 From: guido Date: Tue, 11 Sep 2001 12:54:03 +0000 Subject: [PATCH] Added doc git-svn-id: https://svn.dealii.org/trunk@4958 0785d39b-7218-0410-832d-ea1e28bc413d --- deal.II/lac/include/lac/solver_bicgstab.h | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/deal.II/lac/include/lac/solver_bicgstab.h b/deal.II/lac/include/lac/solver_bicgstab.h index 28d562df23..4bb4369279 100644 --- a/deal.II/lac/include/lac/solver_bicgstab.h +++ b/deal.II/lac/include/lac/solver_bicgstab.h @@ -43,7 +43,8 @@ * the size of the orthogonalized residual computed during the * iteration may be larger by orders of magnitude than the true * residual. This is due to numerical instabilities related to badly - * conditioned matrices. + * conditioned matrices. Since this instability results in a bad + * stopping criterion, the default for this parameter is @p{true}. * * The second parameter is the size of a breakdown criterion. It is * difficult to find a general good criterion, so if things do not @@ -69,11 +70,11 @@ class SolverBicgstab : public Solver /** * Constructor. * - * The default is no exact residual + * The default is exact residual * computation and breakdown * parameter 1e-16. */ - AdditionalData(bool exact_residual = false, + AdditionalData(bool exact_residual = true, double breakdown=1.e-10) : exact_residual(exact_residual), breakdown(breakdown) -- 2.39.5