petsc-3.13.6 2020-09-29
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Indicates the locations (rows and columns) in the matrix where nonzeros will be inserted using a local number of the rows and columns


#include <petscmat.h>
PetscErrorCode MatPreallocateSymmetricSetBlock(PetscInt nrows, PetscInt *rows,PetscInt ncols, PetscInt *cols,PetscInt *dnz, PetscInt *onz)
Not Collective

Input Parameters

nrows - the number of rows indicated
rows - the indices of the rows
ncols - the number of columns in the matrix
cols - the columns indicated
dnz - the array that will be passed to the matrix preallocation routines
onz - the other array passed to the matrix preallocation routines


See Users-Manual: Chapter 14 Hints for Performance Tuning for more details.

Do not malloc or free dnz and onz that is handled internally by these routines

This is a MACRO not a function because it uses variables declared in MatPreallocateInitialize().

See Also

MatPreallocateFinalize(), MatPreallocateSet(), MatPreallocateInitialize(),
MatPreallocateSymmetricSetLocalBlock(), MatPreallocateSetLocal()




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