#include "petscmat.h" PetscErrorCode MatCreateSeqSELL(MPI_Comm comm,PetscInt m,PetscInt n,PetscInt maxallocrow,const PetscInt rlen[],Mat *A)Collective
| 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 |
It is recommended that one use the MatCreate(), MatSetType() and/or MatSetFromOptions(), MatXXXXSetPreallocation() paradigm instead of this routine directly. [MatXXXXSetPreallocation() is, for example, MatSeqSELLSetPreallocation]
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()