MatCreateSeqAIJFromTriple#

Creates an sequential MATSEQAIJ matrix using matrix elements (in COO format) provided by the user.

Synopsis#

#include "petscmat.h" 
PetscErrorCode MatCreateSeqAIJFromTriple(MPI_Comm comm, PetscInt m, PetscInt n, PetscInt i[], PetscInt j[], PetscScalar a[], Mat *mat, PetscInt nz, PetscBool idx)

Collective

Input Parameters#

  • comm - must be an MPI communicator of size 1

  • m - number of rows

  • n - number of columns

  • i - row indices

  • j - column indices

  • a - matrix values

  • nz - number of nonzeros

  • idx - if the i and j indices start with 1 use PETSC_TRUE otherwise use PETSC_FALSE

Output Parameter#

  • mat - the matrix

Example#

For the following matrix, the input data expected is as shown (using 0 based indexing)

        1 0 0
        2 0 3
        4 5 6

        i =  {0,1,1,2,2,2}
        j =  {0,0,2,0,1,2}
        v =  {1,2,3,4,5,6}

Note#

Instead of using this function, users should also consider MatSetPreallocationCOO() and MatSetValuesCOO(), which allow repeated or remote entries, and are particularly useful in iterative applications.

See Also#

Matrices, Mat, MatCreate(), MatCreateAIJ(), MatCreateSeqAIJ(), MatCreateSeqAIJWithArrays(), MatMPIAIJSetPreallocationCSR(), MatSetValuesCOO(), MatSetPreallocationCOO()

Level#

intermediate

Location#

src/mat/impls/aij/seq/aij.c

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