1 #ifdef PETSC_RCS_HEADER 2 static char vcid[] = "$Id: shellcnv.c,v 1.3 1997/06/05 12:54:00 bsmith Exp balay $"; 3 #endif 4 5 6 #include "petsc.h" 7 #include "src/mat/matimpl.h" /*I "mat.h" I*/ 8 #include "src/vec/vecimpl.h" 9 10 #undef __FUNC__ 11 #define __FUNC__ "MatConvert_Shell" 12 int MatConvert_Shell(Mat oldmat,MatType newtype, Mat *mat) 13 { 14 Vec in,out; 15 int ierr,i,M,m,size,*rows,start,end; 16 MPI_Comm comm; 17 Scalar *array,zero = 0.0,one = 1.0; 18 19 PetscValidHeaderSpecific(oldmat,MAT_COOKIE); 20 PetscValidPointer(mat); 21 22 if (newtype != MATSEQDENSE || newtype != MATMPIDENSE) { 23 SETERRQ(PETSC_ERR_SUP,1,"Can only convert shell matrices to dense currently"); 24 } 25 comm = oldmat->comm; 26 27 MPI_Comm_size(comm,&size); 28 29 ierr = MatGetOwnershipRange(oldmat,&start,&end); CHKERRQ(ierr); 30 ierr = VecCreateMPI(comm,end-start,PETSC_DECIDE,&in); CHKERRQ(ierr); 31 ierr = VecDuplicate(in,&out); CHKERRQ(ierr); 32 ierr = VecGetSize(in,&M); CHKERRQ(ierr); 33 ierr = VecGetLocalSize(in,&m); CHKERRQ(ierr); 34 rows = (int *) PetscMalloc( (m+1)*sizeof(int) ); CHKPTRQ(rows); 35 for ( i=0; i<m; i++ ) {rows[i] = start + i;} 36 37 if (size == 1) { 38 ierr = MatCreateSeqDense(comm,M,M,PETSC_NULL,mat); CHKERRQ(ierr); 39 } else { 40 ierr = MatCreateMPIDense(comm,m,M,M,M,PETSC_NULL,mat); CHKERRQ(ierr); 41 /* ierr = MatCreateMPIAIJ(comm,m,m,M,M,0,0,0,0,mat); CHKERRQ(ierr); */ 42 } 43 44 for ( i=0; i<M; i++ ) { 45 ierr = VecSet(&zero,in); CHKERRQ(ierr); 46 ierr = VecSetValues(in,1,&i,&one,INSERT_VALUES); CHKERRQ(ierr); 47 ierr = VecAssemblyBegin(in); CHKERRQ(ierr); 48 ierr = VecAssemblyEnd(in); CHKERRQ(ierr); 49 50 ierr = MatMult(oldmat,in,out); CHKERRQ(ierr); 51 52 ierr = VecGetArray(out,&array); CHKERRQ(ierr); 53 ierr = MatSetValues(*mat,m,rows,1,&i,array,INSERT_VALUES); CHKERRQ(ierr); 54 ierr = VecRestoreArray(out,&array); CHKERRQ(ierr); 55 56 } 57 PetscFree(rows); 58 ierr = VecDestroy(in); CHKERRQ(ierr); 59 ierr = VecDestroy(out); CHKERRQ(ierr); 60 ierr = MatAssemblyBegin(*mat,MAT_FINAL_ASSEMBLY); CHKERRQ(ierr); 61 ierr = MatAssemblyEnd(*mat,MAT_FINAL_ASSEMBLY); CHKERRQ(ierr); 62 return 0; 63 } 64 65 66 67