deal.II version GIT relicensing-2220-ge8e5360a96 2024-12-05 09:50:00+00:00
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#include <deal.II/lac/sparse_decomposition.h>
Public Member Functions | |
AdditionalData (const double strengthen_diagonal=0., const unsigned int extra_off_diagonals=0, const bool use_previous_sparsity=false, const SparsityPattern *use_this_sparsity=nullptr) | |
Public Attributes | |
double | strengthen_diagonal |
unsigned int | extra_off_diagonals |
bool | use_previous_sparsity |
const SparsityPattern * | use_this_sparsity |
Parameters for SparseDecomposition.
Definition at line 140 of file sparse_decomposition.h.
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explicit |
Constructor. For the parameters' description, see below.
double SparseLUDecomposition< number >::AdditionalData::strengthen_diagonal |
strengthen_diag
times the sum of absolute row entries is added to the diagonal entries.
Per default, this value is zero, i.e. the diagonal is not strengthened.
Definition at line 157 of file sparse_decomposition.h.
unsigned int SparseLUDecomposition< number >::AdditionalData::extra_off_diagonals |
By default, the initialize(matrix, data)
function creates its own sparsity. This sparsity has the same SparsityPattern as matrix
with some extra off diagonals the number of which is specified by extra_off_diagonals
.
The user can give a SparsityPattern to use_this_sparsity
. Then this sparsity is used and the extra_off_diagonals
argument is ignored.
Definition at line 169 of file sparse_decomposition.h.
bool SparseLUDecomposition< number >::AdditionalData::use_previous_sparsity |
If this flag is true the initialize() function uses the same sparsity that was used during the previous initialize() call.
This might be useful when several linear problems on the same sparsity need to solved, as for example several Newton iteration steps on the same triangulation.
Definition at line 179 of file sparse_decomposition.h.
const SparsityPattern* SparseLUDecomposition< number >::AdditionalData::use_this_sparsity |
When a SparsityPattern is given to this argument, the initialize() function calls reinit(*use_this_sparsity)
causing this sparsity to be used.
Note that the sparsity structures of *use_this_sparsity
and the matrix passed to the initialize function need not be equal. Fill-in is allowed, as well as filtering out some elements in the matrix.
Definition at line 191 of file sparse_decomposition.h.