MatMPIAdjSetPreallocation#

Sets the array used for storing the matrix elements

Synopsis#

#include "petscmat.h" 
PetscErrorCode MatMPIAdjSetPreallocation(Mat B, PetscInt *i, PetscInt *j, PetscInt *values)

Logically Collective

Input Parameters#

B - the matrix
i - the indices into j for the start of each row
j - the column indices for each row (sorted for each row). The indices in i and j start with zero (NOT with one).
values - [use NULL if not provided] edge weights

Notes#

The indices in i and j start with zero (NOT with one).

You must NOT free the i, values and j arrays yourself. PETSc will free them when the matrix is destroyed; you must allocate them with PetscMalloc().

You should not include the matrix diagonal elements.

If you already have a matrix, you can create its adjacency matrix by a call to MatConvert(), specifying a type of MATMPIADJ.

Possible values for MatSetOption() - MAT_STRUCTURALLY_SYMMETRIC