Пакет spai: Информация

Исходный пакет: spai
Версия: 3.2-alt7
Собран:  12 августа 2012 г. 22:17
Категория: Науки/Математика
Сообщить об ошибке в пакете
Домашняя страница: http://www.computational.unibas.ch/software/spai/

Лицензия: GPL v2
О пакете: SParse Approximate Inverse Preconditioner
Описание: 
Given a sparse matrix A the SPAI Algorithm computes a sparse approximate inverse
M by minimizing || AM - I || in the Frobenius norm. The approximate inverse is
computed explicitly and can then be applied as a preconditioner to an iterative
method. The sparsity pattern of the approximate inverse is either fixed a priori
or captured automatically:

  * Fixed sparsity: The sparsity pattern of M is either banded or a subset of
  the sparsity pattern of A.
  * Adaptive sparsity: The algorithm proceeds until the 2-norm of each column of
  AM-I is less than eps. By varying eps the user controls the quality and the
  cost of computing the preconditioner. Usually the optimal eps lies between 0.5
  and 0.7.

A very sparse preconditioner is very cheap to compute but may not lead to much
improvement, while if M becomes rather dense it becomes too expensive to
compute. The optimal preconditioner lies between these two extremes and is
problem and computer architecture dependent.

The approximate inverse M can also be used as a robust (parallel) smoother for
(algebraic) multi-grid methods.

Список rpm-пакетов, предоставляемых данным srpm-пакетом:
libspai (x86_64, i586)
libspai-debuginfo (x86_64, i586)
libspai-devel (x86_64, i586)
libspai-devel-doc (noarch)
spai (x86_64, i586)
spai-debuginfo (x86_64, i586)

Сопровождающий: Eugeny A. Rostovtsev

Список участников:
Eugeny A. Rostovtsev

Права:
Eugeny A. Rostovtsev
@qa
@everybody

    1. gcc-fortran
    2. openmpi-devel
    3. liblapack-devel

Последнее изменение


12 августа 2012 г. Eugeny A. Rostovtsev 3.2-alt7
- Built with OpenBLAS instead of GotoBLAS2
10 апреля 2011 г. Eugeny A. Rostovtsev 3.2-alt6
- Built with GotoBLAS2 instead of ATLAS
- Disabled devel-static package
11 февраля 2011 г. Eugeny A. Rostovtsev 3.2-alt5
- Rebuilt for debuginfo