int main(int argc,char **argv) {
Mat A,B,As;
const PetscInt *ai,*aj;
PetscInt i,j,k,nz,n,asi[]={0,2,3,4,6,7};
PetscInt asj[]={0,4,1,2,3,4,4};
PetscScalar asa[7],*aa;
PetscRandom rctx;
PetscErrorCode ierr;
PetscMPIInt size;
PetscBool flg;
PetscInitialize(&argc,&argv,(char *)0,help);
ierr = MPI_Comm_size(PETSC_COMM_WORLD,&size);CHKERRQ(ierr);
if (size != 1) SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_SUP,"This is a uniprocessor example only!");
/* Create a aij matrix for checking */
ierr = MatCreateSeqAIJ(PETSC_COMM_SELF,5,5,2,PETSC_NULL,&A);CHKERRQ(ierr);
ierr = PetscRandomCreate(PETSC_COMM_WORLD,&rctx);CHKERRQ(ierr);
ierr = PetscRandomSetFromOptions(rctx);CHKERRQ(ierr);
k = 0;
for (i=0; i<5; i++) {
nz = asi[i+1] - asi[i]; /* length of i_th row of A */
for (j=0; j<nz; j++){
ierr = PetscRandomGetValue(rctx,&asa[k]);CHKERRQ(ierr);
ierr = MatSetValues(A,1,&i,1,&asj[k],&asa[k],INSERT_VALUES);CHKERRQ(ierr);
ierr = MatSetValues(A,1,&i,1,&asj[k],&asa[k],INSERT_VALUES);CHKERRQ(ierr);
if (i != asj[k]){ /* insert symmetric entry */
ierr = MatSetValues(A,1,&asj[k],1,&i,&asa[k],INSERT_VALUES);CHKERRQ(ierr);
}
k++;
}
}
ierr = MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);
ierr = MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);
/* Create a baij matrix using MatCreateSeqBAIJWithArrays() */
ierr = MatGetRowIJ(A,0,PETSC_FALSE,PETSC_FALSE,&n,&ai,&aj,&flg);CHKERRQ(ierr);
ierr = MatSeqAIJGetArray(A,&aa);CHKERRQ(ierr);
/* WARNING: This sharing is dangerous if either A or B is later assembled */
ierr = MatCreateSeqBAIJWithArrays(PETSC_COMM_SELF,1,5,5,(PetscInt*)ai,(PetscInt*)aj,aa,&B);CHKERRQ(ierr);
ierr = MatSeqAIJRestoreArray(A,&aa);CHKERRQ(ierr);
ierr = MatRestoreRowIJ(A,0,PETSC_FALSE,PETSC_FALSE,&n,&ai,&aj,&flg);CHKERRQ(ierr);
ierr = MatMultEqual(A,B,10,&flg);CHKERRQ(ierr);
if (!flg) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_NOTSAMETYPE,"MatMult(A,B) are NOT equal");
/* Create a sbaij matrix using MatCreateSeqSBAIJWithArrays() */
ierr = MatCreateSeqSBAIJWithArrays(PETSC_COMM_SELF,1,5,5,asi,asj,asa,&As);CHKERRQ(ierr);
ierr = MatMultEqual(A,As,10,&flg);CHKERRQ(ierr);
if (!flg) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_NOTSAMETYPE,"MatMult(A,As) are NOT equal");
/* Free spaces */
ierr = PetscRandomDestroy(&rctx);CHKERRQ(ierr);
ierr = MatDestroy(&A);CHKERRQ(ierr);
ierr = MatDestroy(&B);CHKERRQ(ierr);
ierr = MatDestroy(&As);CHKERRQ(ierr);
ierr = PetscFinalize();
return(0);
}
PETSC_EXTERN void PETSC_STDCALL matcreateseqbaijwitharrays_(MPI_Fint * comm,PetscInt *bs,PetscInt *m,PetscInt *n,PetscInt *i,PetscInt *j,PetscScalar *a,Mat *mat, int *__ierr ){
*__ierr = MatCreateSeqBAIJWithArrays(
MPI_Comm_f2c(*(comm)),*bs,*m,*n,i,j,a,mat);
}
