petsc-3.3-p7 2013-05-11

MatAssemblyBegin

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

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

Collective on Mat

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

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.