MatResetPreallocation#

Reset matrix to use the original nonzero pattern provided by users.

Synopsis#

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

Collective on A

Input Parameters#

  • A - the matrix

Notes#

The allocated memory will be shrunk after calling MatAssemblyBegin() and MatAssemblyEnd() with MAT_FINAL_ASSEMBLY.

Users can reset the preallocation to access the original memory.

Currently only supported for MATMPIAIJ and MATSEQAIJ matrices.

See Also#

MatSeqAIJSetPreallocation(), MatMPIAIJSetPreallocation(), MatXAIJSetPreallocation()

Level#

beginner

Location#

src/mat/interface/matrix.c

Examples#

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

Implementations#

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


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