petsc-3.8.4 2018-03-24

MatConvert

Converts a matrix to another matrix, either of the same or different type.

Synopsis

#include "petscmat.h" 
PetscErrorCode MatConvert(Mat mat, MatType newtype,MatReuse reuse,Mat *M)

Collective on Mat

Input Parameters

	mat	- the matrix
	newtype	- new matrix type. Use MATSAME to create a new matrix of the same type as the original matrix.
	reuse	- denotes if the destination matrix is to be created or reused. Use MAT_INPLACE_MATRIX for inplace conversion (that is when you want the input mat to be changed to contain the matrix in the new format), otherwise use MAT_INITIAL_MATRIX or MAT_REUSE_MATRIX (can only be used after the first call was made with MAT_INITIAL_MATRIX, causes the matrix space in M to be reused).

Output Parameter

M -pointer to place new matrix

Notes

MatConvert() first creates a new matrix and then copies the data from the first matrix. A related routine is MatCopy(), which copies the matrix entries of one matrix to another already existing matrix context.

Cannot be used to convert a sequential matrix to parallel or parallel to sequential, the MPI communicator of the generated matrix is always the same as the communicator of the input matrix.

Examples