MatResetPreallocation#

Synopsis#

#include "petscmat.h" 
PetscErrorCode MatResetPreallocation(Mat A)

Collective

Input Parameter#

• A - the matrix

Notes#

After calling MatAssemblyBegin() and MatAssemblyEnd() with MAT_FINAL_ASSEMBLY the matrix data structures represent the nonzeros assigned to the matrix. If that space is less than the preallocated space that extra preallocated space is no longer available to take on new values. MatResetPreallocation() makes all of the preallocation space available

Current values in the matrix are lost in this call

Currently only supported for MATAIJ matrices.

See Also#

Matrices, Mat, MatSeqAIJSetPreallocation(), MatMPIAIJSetPreallocation(), MatXAIJSetPreallocation()

Level#

beginner

Location#

src/mat/interface/matrix.c

Examples#

src/mat/tutorials/ex4f.F90
src/mat/tutorials/ex4.c

Implementations#

MatResetPreallocation_MPIAIJ() in src/mat/impls/aij/mpi/mpiaij.c
MatResetPreallocation_SeqAIJ() in src/mat/impls/aij/seq/aij.c

Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages