Sets the number of search directions in BiCGStab(L).
PetscErrorCode KSPBCGSLSetEll(KSP ksp, PetscInt ell)
Logically Collective on KSP
|ksp ||- iterative context obtained from KSPCreate
|ell ||- number of search directions
Options Database Keys
-ksp_bcgsl_ell ell -
For large ell it is common for the polynomial update problem to become singular (due to happy breakdown for smallish
test problems, but also for larger problems). Consequently, by default, the system is solved by pseudoinverse, which
allows the iteration to complete successfully. See KSPBCGSLSetUsePseudoinverse() to switch to a conventional solve.
BiCGStab(L), set, exact residuals,
KSPBCGSLSetUsePseudoinverse(), KSP, KSPBCGSL
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages