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[ gmres] or [ pcg].
The classic book [ Templates for the Solution of Linear Systems: Building Blocks for Iterative Methods] has a [ chapter] describing the
ILU algorithm in detail, though the algorithm described there should be adapted to Octave's internal Sparse Matrix file format which is [ CCS] rather than [ CRS]. The implementation of ILU in Octave has been recently discussed in the maintainers list and initial implementations were posted in this [ thread]. In another [ thread] it was suggested to implement the ILU by interfacing Octave to [ ITSOL] . Compared to other projects in this section this one might require more knowledge of C++.
=== Improve logm, sqrtm, funm ===


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