#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().

** Level:developer
Location:**src/mat/interface/matrix.c

Index of all Mat routines

Table of Contents for all manual pages

Index of all manual pages