sortev - Man Page
Name
sortev — Sorting the eigenvalues
— Enable or disable the eigenvalue sorting in frontend routines.
Synopsis
Modules
module mepack_options_sortev
Options to sort eigenvalues in the frontend.
Functions/Subroutines
int mepack_sortev_enabled (void)
Return if the eigenvalue sorting is enabled or not.
void mepack_sortev_enable (int sort)
Enable or disable the eigenvalues sorting in the frontend routines.
integer function mepack_options_sortev::sortev_enabled ()
Return if the sorting of the eigenvalues is enabled.
subroutine mepack_options_sortev::sortev_enable (sort)
Enable or disable the sorting of the eigenvalues.
Detailed Description
Enable or disable the eigenvalue sorting in frontend routines.
By definition, the (generalized) Schur decompositions do not have a predefined order of the eigenvalues on their diagonal. Especially, complex conjugate 2x2 blocks can appear everywhere. This might have a negative effect on the performance of the algorithms. If the sorting of the eigenvalues is enabled, the coefficient matrices can be partitioned in a regular NB x NB grid without the need for an adjustment due to complex conjugate eigenvalues on the diagonal of the Schur decomposition.
Function/Subroutine Documentation
void mepack_sortev_enable (int sort)
Enable or disable the eigenvalues sorting in the frontend routines.
- Parameters
sort Boolean integer value to enable or disable the eigenvalue sorting.
The mepack_sortev_enable function enables or disables the sorting of the eigenvalues before a triangular solver is called by one of the frontend routines.
Definition at line 51 of file sortev.c.
int mepack_sortev_enabled (void )
Return if the eigenvalue sorting is enabled or not.
- Returns
A non-zero if the eigenvalue sorting is enabled.
The mepack_sortev_enabled function returns a true value if the eigenvalue sorting is enabled. That means, frontend routines sort the eigenvalues before calling a triangular solver in order to match the block structure.
Definition at line 36 of file sortev.c.
subroutine mepack_options_sortev::sortev_enable (integer, intent(in) sort)
Enable or disable the sorting of the eigenvalues.
- Parameters
SORT Integer identifying if the eigenvalues should be sorted or not. #
The SORTEV_ENABLE subroutine enables or disable the sorting of the eigenvalues before a triangular matrix equation solver is called in a frontend routine.
Definition at line 51 of file sortev.f90.
integer function mepack_options_sortev::sortev_enabled
Return if the sorting of the eigenvalues is enabled.
- Returns
A non zero value if the eigenvalues should be sorted.
The SORTEV_ENABLED function returns a non zero value if the eigenvalues of the coefficient matrices should be sorted before the equations are solved.
Definition at line 38 of file sortev.f90.
Author
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