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Project Description

block_diag_ilu is an open source C++ single header-file implementation of an incomplete LU decomposition routine suitable for diagonally dominant (square) block diagonal matrices with sub- and super diagonals of small magnitude. It is useful for preconditioning linear systems. The use-case in mind is for integrating discretized PDEs of mixed chemical kinetics / diffusion problems where the diffusion process may be accurately considered a mild perturbation.

A picture is worth a thousand words, so if your matrix looks anything like this:

its LU decomposition then looks like this:

then block_diag_ilu should be able to save quite a bit of time when solving linear systems approximately, e.g. for preconditioning.

Conditional compilation

The following macros affect the compilation:

Macro name Action (when defined) Default
NDEBUG use std::unique_ptr instead of std::vector as underlying data structure. undefined
BLOCK_DIAG_ILU_WITH_DGETRF Use unblocked (parallell) internal implementation of LAPACK’s dgetrf. undefined

License

The source code is Open Source and is released under the very permissive “simplified (2-clause) BSD license”. See LICENSE.txt for further details.

Contributors are welcome to suggest improvements at https://github.com/chemreac/block_diag_ilu

Author

Björn Dahlgren, contact:
  • gmail adress: bjodah
  • kth.se adress: bda
Release History

Release History

0.2.5

This version

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0.2.4

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0.2.3

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0.2.2

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0.2.1

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0.2.0

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0.1.1

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0.1.0

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Download Files

Download Files

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File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
block_diag_ilu-0.2.5.tar.gz (131.5 kB) Copy SHA256 Checksum SHA256 Source Nov 23, 2016

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