petsc-3.14.5 2021-03-03
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# MatCreateSeqAIJFromTriple

Creates an sequential AIJ 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 | - 0 or 1 based

### Output Parameter

| mat | - the matrix

### Notes

The i and j indices are 0 based

The format which is used for the sparse matrix input, is equivalent to a row-major ordering.. i.e for the following matrix, the input data expected is

### as shown

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}

### See Also

MatCreate(), MatCreateAIJ(), MatCreateSeqAIJ(), MatCreateSeqAIJWithArrays(), MatMPIAIJSetPreallocationCSR()

### Level

intermediate

### Location

src/mat/impls/aij/seq/aij.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages