#include "petscmat.h" PetscErrorCode MatShift(Mat Y,PetscScalar a)Neighbor-wise Collective on Mat
| Y | - the matrices | |
| a | - the PetscScalar |
Notes: If the matrix Y is missing some diagonal entries this routine can be very slow. To make it fast one should initially fill the matrix so that all diagonal entries have a value (with a value of zero for those locations that would not have an entry).
Developers Note: If the local "diagonal part" of the matrix Y has no entries then the local diagonal part is preallocated with 1 nonzero per row for the to be added values. This allows for fast shifting of an empty matrix.
Level:intermediate
Location:src/mat/utils/axpy.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages