Lines Matching refs:Sp

2331 availability of a good preconditioner $\hat Sp$ for the Schur
2333 $\hat Sp$ via
2334 `PCFieldSplitSetSchurPre(pc,PC_FIELDSPLIT_SCHUR_PRE_USER,Sp)`.
2335 Without a good problem-specific $\hat Sp$, you can use
2342 $\hat Sp = A_{11}$ is used to build a preconditioner for
2346 $\hat Sp = \hat S$ and use the Schur complement matrix itself to
2353 approximately, to ensure the sparsity of $\hat Sp$ as much
2356 $\hat Sp = A_{11} - A_{10} \text{inv}(A_{00}) A_{01}$.
2380 done by attaching the matrix/matrices to the $Sp$ matrix they
2384 PetscObjectCompose((PetscObject)Sp,"LSC_L",(PetscObject)L);
2385 PetscObjectCompose((PetscObject)Sp,"LSC_Lp",(PetscObject)Lp);