petsc-3.11.4 2019-09-28
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MatResetPreallocation

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

Synopsis

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

Input Parameters

A -the Mat context

Notes

The allocated memory will be shrunk after calling MatAssembly with MAT_FINAL_ASSEMBLY. Users can reset the preallocation to access the original memory. Currently support MPIAIJ and SEQAIJ.

Keywords

Mat, ResetPreallocation

See Also

MatSeqAIJSetPreallocation(), MatMPIAIJSetPreallocation(), MatXAIJSetPreallocation()

Level

beginner

Location

src/mat/interface/matrix.c

Examples

src/mat/examples/tutorials/ex4.c.html
src/mat/examples/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

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