petsc-3.13.6 2020-09-29

MatDuplicate

Duplicates a matrix including the non-zero structure.

Synopsis

#include "petscmat.h" 
PetscErrorCode MatDuplicate(Mat mat,MatDuplicateOption op,Mat *M)

Collective on Mat

Input Parameters

	mat	- the matrix
	op	- One of MAT_DO_NOT_COPY_VALUES, MAT_COPY_VALUES, or MAT_SHARE_NONZERO_PATTERN. See the manual page for MatDuplicateOption for an explanation of these options.

Output Parameter

M -pointer to place new matrix

Notes

You cannot change the nonzero pattern for the parent or child matrix if you use MAT_SHARE_NONZERO_PATTERN. When original mat is a product of matrix operation, e.g., an output of MatMatMult() or MatCreateSubMatrix(), only the simple matrix data structure of mat is duplicated and the internal data structures created for the reuse of previous matrix operations are not duplicated. User should not use MatDuplicate() to create new matrix M if M is intended to be reused as the product of matrix operation.

Level

intermediate

Location

src/mat/interface/matrix.c

Examples

src/ksp/ksp/tutorials/ex5.c.html
src/ksp/ksp/tutorials/ex42.c.html
src/ksp/ksp/tutorials/ex5f.F90.html
src/ts/tutorials/ex3.c.html
src/ts/tutorials/ex50.c.html
src/tao/unconstrained/tutorials/spectraladjointassimilation.c.html
src/tao/pde_constrained/tutorials/elliptic.c.html
src/tao/pde_constrained/tutorials/parabolic.c.html
src/tao/pde_constrained/tutorials/hyperbolic.c.html
src/tao/tutorials/ex4.c.html

Implementations