MatResetPreallocation

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

Synopsis

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

Collective

Input Parameter

• 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 MATAIJ matrices.

See Also

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

Level

beginner

Location

src/mat/interface/matrix.c

Examples

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

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