Updating the QR decomposition of block tridiagonal and block Hessenberg matrices generated by block Krylov space methods
For MINRES and SYMMLQ it is essential to compute the QR decompositions of tridiagonal coefficient matrices gained in the Lanczos process. Likewise, for GMRES one has to find those of Hessenberg matrices. These QR decompositions are computed by an update scheme where in every step a single Givens rot...
| Principais autores: | , |
|---|---|
| Formato: | Report |
| Publicado em: |
Unspecified
2005
|