MatZeroRowsColumnsIS#

Zeros all entries (except possibly the main diagonal) of a set of rows and columns of a matrix.

Synopsis#

#include "petscmat.h" 
PetscErrorCode MatZeroRowsColumnsIS(Mat mat, IS is, PetscScalar diag, Vec x, Vec b)

Collective

Input Parameters#

  • mat - the matrix

  • is - the rows to zero

  • diag - value put in all diagonals of eliminated rows (0.0 will even eliminate diagonal entry)

  • x - optional vector of solutions for zeroed rows (other entries in vector are not used)

  • b - optional vector of right hand side, that will be adjusted by provided solution

Note#

See MatZeroRowsColumns() for details on how this routine operates.

See Also#

Matrices, Mat, MatZeroRowsIS(), MatZeroRowsColumns(), MatZeroRowsLocalIS(), MatZeroRowsStencil(), MatZeroEntries(), MatZeroRowsLocal(), MatSetOption(), MatZeroRowsColumnsLocal(), MatZeroRowsColumnsLocalIS(), MatZeroRows(), MatZeroRowsColumnsStencil()

Level#

intermediate

Location#

src/mat/interface/matrix.c

Examples#

src/ksp/ksp/tutorials/ex84.c
src/ksp/ksp/tutorials/ex71.c

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