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); }
void PETSC_STDCALL matcreateseqsbaijwitharrays_(MPI_Fint * comm,PetscInt *bs,PetscInt *m,PetscInt *n,PetscInt* i,PetscInt*j,PetscScalar *a,Mat *mat, int *__ierr ){ *__ierr = MatCreateSeqSBAIJWithArrays( MPI_Comm_f2c( *(comm) ),*bs,*m,*n,i,j,a,mat); }