MatSetValuesLocal#

Inserts or adds values into certain locations of a matrix, using a local numbering of the rows and columns.

Synopsis#

#include "petscmat.h" 
PetscErrorCode MatSetValuesLocal(Mat mat, PetscInt nrow, const PetscInt irow[], PetscInt ncol, const PetscInt icol[], const PetscScalar y[], InsertMode addv)

Not Collective

Input Parameters#

  • mat - the matrix

  • nrow - number of rows

  • irow - the row local indices

  • ncol - number of columns

  • icol - the column local indices

  • y - a logically two-dimensional array of values

  • addv - either INSERT_VALUES to add values to any existing entries, or INSERT_VALUES to replace existing entries with new values

Notes#

If you create the matrix yourself (that is not with a call to DMCreateMatrix()) then you MUST call MatSetLocalToGlobalMapping() before using this routine

Calls to MatSetValuesLocal() with the INSERT_VALUES and ADD_VALUES options cannot be mixed without intervening calls to the assembly routines.

These values may be cached, so MatAssemblyBegin() and MatAssemblyEnd() MUST be called after all calls to MatSetValuesLocal() have been completed.

Developer Note#

This is labeled with C so does not automatically generate Fortran stubs and interfaces because it requires multiple Fortran interfaces depending on which arguments are scalar or arrays.

See Also#

Matrices, Mat, MatAssemblyBegin(), MatAssemblyEnd(), MatSetValues(), MatSetLocalToGlobalMapping(), MatGetValuesLocal()

Level#

intermediate

Location#

src/mat/interface/matrix.c

Examples#

src/tao/unconstrained/tutorials/spectraladjointassimilation.c
src/tao/bound/tutorials/plate2.c
src/snes/tutorials/ex28.c
src/tao/unconstrained/tutorials/burgers_spectral.c
src/ksp/ksp/tutorials/ex70.c
src/tao/bound/tutorials/jbearing2.c
src/ts/tutorials/ex50.c
src/ksp/ksp/tutorials/ex36.cxx
src/tao/unconstrained/tutorials/eptorsion2.c
src/ts/tutorials/ex14.c

Implementations#

MatSetValuesLocal_IS() in src/mat/impls/is/matis.c


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Index of all manual pages