MatSeqAIJGetCSRAndMemType#

Get the CSR arrays and the memory type of the MATSEQAIJ matrix

Synopsis#

#include "petscmat.h" 
PetscErrorCode MatSeqAIJGetCSRAndMemType(Mat mat, const PetscInt **i, const PetscInt **j, PetscScalar **a, PetscMemType *mtype)

Not Collective; No Fortran Support

Input Parameter#

mat - a matrix of type MATSEQAIJ or its subclasses

Output Parameters#

i - row map array of the matrix
j - column index array of the matrix
a - data array of the matrix
memtype - memory type of the arrays

Notes#

Any of the output parameters can be NULL, in which case the corresponding value is not returned. If mat is a device matrix, the arrays are on the device. Otherwise, they are on the host.

One can call this routine on a preallocated but not assembled matrix to just get the memory of the CSR underneath the matrix. If the matrix is assembled, the data array a is guaranteed to have the latest values of the matrix.