MatGetValue#

Gets a single value from a matrix

Synopsis#

static inline PetscErrorCode MatGetValue(Mat mat, PetscInt row, PetscInt col, PetscScalar *va)

Not Collective; can only return a value owned by the given process

Input Parameters#

  • mat - the matrix

  • row - the row location of the entry

  • col - the column location of the entry

Output Parameter#

  • va - the value

Notes#

The matrix must have been assembled with MatAssemblyBegin() and MatAssemblyEnd() before this call

For efficiency one should use MatGetValues() and get several values simultaneously.

See notes for MatGetValues().

See Also#

Matrices, Mat, MatAssemblyBegin(), MatAssemblyEnd(), MatSetValue(), MatGetValueLocal(), MatGetValues()

Level#

advanced

Location#

include/petscmat.h

Examples#

src/ts/tutorials/ex14.c
src/snes/tutorials/ex48.c


Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages