petsc-3.14.6 2021-03-30

MatAssemblyBegin

Begins assembling the matrix. This routine should be called after completing all calls to MatSetValues().

Synopsis

#include "petscmat.h" 
PetscErrorCode MatAssemblyBegin(Mat mat,MatAssemblyType type)

Collective on Mat

Input Parameters

	mat	- the matrix
	type	- type of assembly, either MAT_FLUSH_ASSEMBLY or MAT_FINAL_ASSEMBLY

Notes

MatSetValues() generally caches the values. The matrix is ready to use only after MatAssemblyBegin() and MatAssemblyEnd() have been called. Use MAT_FLUSH_ASSEMBLY when switching between ADD_VALUES and INSERT_VALUES in MatSetValues(); use MAT_FINAL_ASSEMBLY for the final assembly before using the matrix.

ALL processes that share a matrix MUST call MatAssemblyBegin() and MatAssemblyEnd() the SAME NUMBER of times, and each time with the same flag of MAT_FLUSH_ASSEMBLY or MAT_FINAL_ASSEMBLY for all processes. Thus you CANNOT locally change from ADD_VALUES to INSERT_VALUES, that is a global collective operation requring all processes that share the matrix.

Space for preallocated nonzeros that is not filled by a call to MatSetValues() or a related routine are compressed out by assembly. If you intend to use that extra space on a subsequent assembly, be sure to insert explicit zeros before MAT_FINAL_ASSEMBLY so the space is not compressed out.

Level

beginner

Location

src/mat/interface/matrix.c

Examples

src/mat/tutorials/ex2.c.html
src/mat/tutorials/ex4.c.html
src/mat/tutorials/ex8.c.html
src/mat/tutorials/ex9.c.html
src/mat/tutorials/ex12.c.html
src/mat/tutorials/ex15.c.html
src/mat/tutorials/ex16.c.html
src/mat/tutorials/ex17.c.html
src/mat/tutorials/ex4f.F90.html
src/mat/tutorials/ex15f.F90.html
src/mat/tutorials/ex17f.F90.html

Implementations