petsc-3.12.5 2020-03-29
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MatCreateSeqSELL

 Creates a sparse matrix in SELL format.

Synopsis

#include "petscmat.h"  
PetscErrorCode MatCreateSeqSELL(MPI_Comm comm,PetscInt m,PetscInt n,PetscInt maxallocrow,const PetscInt rlen[],Mat *A)
Collective

Input Parameters

+ comm - MPI communicator, set to PETSC_COMM_SELF . m - number of rows . n - number of columns . rlenmax - maximum number of nonzeros in a row - rlen - array containing the number of nonzeros in the various rows (possibly different for each row) or NULL

Output Parameter

. A - the matrix

It is recommended that one use the MatCreate(), MatSetType() and/or MatSetFromOptions(), MatXXXXSetPreallocation() paradigm instead of this routine directly. [MatXXXXSetPreallocation() is, for example, MatSeqSELLSetPreallocation]

Notes

If nnz is given then nz is ignored

Specify the preallocated storage with either rlenmax or rlen (not both). Set rlenmax=PETSC_DEFAULT and rlen=NULL for PETSc to control dynamic memory allocation. For large problems you MUST preallocate memory or you will get TERRIBLE performance, see the users' manual chapter on matrices.

.seealso: MatCreate(), MatCreateSELL(), MatSetValues(), MatCreateSeqSELLWithArrays()

Level

intermediate

Location

src/mat/impls/sell/seq/sell.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages