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# MatSetValuesCOO

set values at once in a matrix preallocated using `MatSetPreallocationCOO()`

## Synopsis

    #include "petscmat.h"
    PetscErrorCode MatSetValuesCOO(Mat A, const PetscScalar coo_v[], InsertMode imode)

Collective

## Input Parameters

- A - matrix being preallocated

- coo_v - the matrix values (can be `NULL`)

- imode - the insert mode

## Notes

The values must follow the order of the indices prescribed with `MatSetPreallocationCOO()` or `MatSetPreallocationCOOLocal()`.

When repeated entries are specified in the COO indices the `coo_v` values are first properly summed, regardless of the value of imode. The imode flag indicates if coo_v must be added to the current values of the matrix (`ADD_VALUES`) or overwritten (`INSERT_VALUES`).

`MatAssemblyBegin()` and `MatAssemblyEnd()` do not need to be called after this routine. It automatically handles the assembly process.

## See Also

Matrices, `Mat`, `MatSetPreallocationCOO()`, `MatSetPreallocationCOOLocal()`, `InsertMode`, `INSERT_VALUES`, `ADD_VALUES`

## Level

beginner

## Location

src/mat/utils/gcreate.c

## Examples

src/mat/tutorials/ex18.c
src/ksp/ksp/tutorials/bench_kspsolve.c
src/ksp/ksp/tutorials/ex88f.F90
src/mat/tutorials/ex18k.kokkos.cxx
src/snes/tutorials/ex55k.kokkos.cxx
src/ksp/ksp/tutorials/ex83f.F90

## Implementations

MatSetValuesCOO_MPIAIJKokkos() in src/mat/impls/aij/mpi/kokkos/mpiaijkok.kokkos.cxx
MatSetValuesCOO_MPIAIJ() in src/mat/impls/aij/mpi/mpiaij.c
MatSetValuesCOO_MPIAIJCUSPARSE() in src/mat/impls/aij/mpi/mpicusparse/mpiaijcusparse.cu
MatSetValuesCOO_MPIAIJHIPSPARSE() in src/mat/impls/aij/mpi/mpihipsparse/mpiaijhipsparse.hip.cxx
MatSetValuesCOO_SeqAIJ() in src/mat/impls/aij/seq/aij.c
MatSetValuesCOO_SeqAIJKokkos() in src/mat/impls/aij/seq/kokkos/aijkok.kokkos.cxx
MatSetValuesCOO_SeqAIJCUSPARSE() in src/mat/impls/aij/seq/seqcusparse/aijcusparse.cu
MatSetValuesCOO_SeqAIJHIPSPARSE() in src/mat/impls/aij/seq/seqhipsparse/aijhipsparse.hip.cxx
MatSetValuesCOO_HYPRE() in src/mat/impls/hypre/mhypre.c
MatSetValuesCOO_IS() in src/mat/impls/is/matis.c

Index of all Mat routines
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Index of all manual pages