#include "petscmat.h" PetscErrorCode MatBackwardSolve(Mat mat,Vec b,Vec x)Neighbor-wise Collective on Mat and Vec
|mat||- the factored matrix|
|b||- the right-hand-side vector|
The vectors b and x cannot be the same. I.e., one cannot call MatBackwardSolve(A,x,x).
For matrix in seqsbaij format with block size larger than 1, the diagonal blocks are not implemented as D = D^(1/2) * D^(1/2) yet. MatForwardSolve() solves U^T*D y = b, and MatBackwardSolve() solves U x = y. Thus they do not provide a symmetric preconditioner.
Most users should employ the simplified KSP interface for linear solvers instead of working directly with matrix algebra routines such as this. See, e.g., KSPCreate().
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages