petsc-3.14.6 2021-03-30
Report Typos and Errors
MatDiagonalSet
Computes Y = Y + D, where D is a diagonal matrix that is represented as a vector. Or Y[i,i] = D[i] if
InsertMode
is
INSERT_VALUES
.
Synopsis
#include "petscmat.h"
PetscErrorCode
MatDiagonalSet
(
Mat
Y,
Vec
D,
InsertMode
is)
Neighbor-wise Collective on
Mat
Input Parameters
Y
- the input matrix
D
- the diagonal matrix, represented as a vector
i
-
INSERT_VALUES
or
ADD_VALUES
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).
See Also
MatShift
(),
MatScale
(),
MatDiagonalScale
()
Level
intermediate
Location
src/mat/utils/axpy.c
Examples
src/ts/tutorials/ex50.c.html
src/tao/constrained/tutorials/tomographyADMM.c.html
src/tao/pde_constrained/tutorials/elliptic.c.html
src/tao/tutorials/ex4.c.html
Implementations
MatDiagonalSet_MPIAIJ in src/mat/impls/aij/mpi/mpiaij.c
MatDiagonalSet_SeqAIJ in src/mat/impls/aij/seq/aij.c
MatDiagonalSet_IS in src/mat/impls/is/matis.c
MatDiagonalSet_Nest in src/mat/impls/nest/matnest.c
MatDiagonalSet_MPISELL in src/mat/impls/sell/mpi/mpisell.c
MatDiagonalSet_Shell in src/mat/impls/shell/shell.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages