#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|
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.
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages