MatPreallocateSetLocalBlock#

Indicates the locations (rows and columns) in the matrix where nonzeros will be inserted using a local number of the rows and columns

Synopsis#

#include <petscmat.h>
PetscErrorCode MatPreallocateSetLocalBlock(ISLocalToGlobalMappping map,PetscInt nrows, PetscInt *rows,PetscInt ncols, PetscInt *cols,PetscInt *dnz, PetscInt *onz)

Not Collective

Input Parameters#

  • map - the row mapping from local numbering to global numbering

  • nrows - the number of rows indicated

  • rows - the indices of the rows

  • cmap - the column mapping from local to global numbering

  • 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

(since v3.19)

Notes#

This routine is no longer needed since assembling matrices without explicit preallocation will not be slower than the use of this routine

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

See Also#

Matrices, MatPreallocateEnd(), MatPreallocateSet(), MatPreallocateSymmetricSetBlock() MatPreallocateBegin(), MatPreallocateSymmetricSetLocalBlock()

Level#

deprecated

Location#

include/petscmat.h

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