| Tag | Date | Description/Changes |
| 2003/09/10 | Initial version solving triangular system put to repository | |
| Implemented solution of general case. | ||
| Implemented a memory pool (Paris). | ||
| Implemented MEX interface to the routine (Paris). | ||
| Implemented QuasiTriangularZero (Paris) (not fully used yet). | ||
| rel-1 | 2003/10-02 | Version sent to Michel. |
| Inheritance streamlined, QuasiTriangular inherits from GeneralMatrix. | ||
| Implemented block diagonalization algorithm. | ||
| Solution routines rewritten so that the output rewrites input, considerable memory improvement. | ||
| MEX interface now links with LAPACK library from Matlab. | ||
| Added a hack to MEX library loading in order to avoid Matlab crash in Wins. | ||
| rel-2 | 2003/10/15 | Version sent to Michel. |
| KronUtils now rewrite input by output using less memory. | ||
| Added iterative solution algorithm (doubling). | ||
| Introduced abstraction for set of parameters (SylvParams). | ||
| Algorithm enabled to solve problems with singular C. | ||
| Implemented a class chooser chossing between QuasiTriangularZero, and QuasiTriangular (padded with zero) depending on size of the problem. Full use of QuasiTriangularZero. | ||
| Reimplemented QuasiTriangular::solve, offdiagonal elements are eleiminated by gauss with partial pivoting, not by transformation of complex eigenvalues. More stable for ill conditioned eigenvalues. | ||
| Reimplemented calculation of eliminating vectors, much more numerically stable now. | ||
| Implemented algorithm for ordering of eigenvalues (not used now, no numerical improvements). | ||
| rel-3 | 2003/12/4 | Version sent to Michel. |
| GeneralMatrix separated for use outside, in sylv module we use its subclass SylvMatrix. Implemented ConstGeneralMatrix (useful outside). | ||
| rel-4 | 2004/6/4 | Version, which was moved to pythie.cepremap.cnrs.fr repository. |