1 /*$Id: shellcnv.c,v 1.16 2000/10/24 20:25:38 bsmith Exp bsmith $*/ 2 3 #include "src/mat/matimpl.h" /*I "petscmat.h" I*/ 4 #include "src/vec/vecimpl.h" 5 6 #undef __FUNC__ 7 #define __FUNC__ "MatConvert_Shell" 8 int MatConvert_Shell(Mat oldmat,MatType newtype,Mat *mat) 9 { 10 Vec in,out; 11 int ierr,i,M,m,*rows,start,end; 12 MPI_Comm comm; 13 Scalar *array,zero = 0.0,one = 1.0; 14 15 PetscFunctionBegin; 16 PetscValidHeaderSpecific(oldmat,MAT_COOKIE); 17 PetscValidPointer(mat); 18 comm = oldmat->comm; 19 20 ierr = MatGetOwnershipRange(oldmat,&start,&end);CHKERRQ(ierr); 21 ierr = VecCreateMPI(comm,end-start,PETSC_DECIDE,&in);CHKERRQ(ierr); 22 ierr = VecDuplicate(in,&out);CHKERRQ(ierr); 23 ierr = VecGetSize(in,&M);CHKERRQ(ierr); 24 ierr = VecGetLocalSize(in,&m);CHKERRQ(ierr); 25 ierr = PetscMalloc((m+1)*sizeof(int),&rows);CHKERRQ(ierr); 26 for (i=0; i<m; i++) {rows[i] = start + i;} 27 28 ierr = MatCreate(comm,m,M,M,M,mat);CHKERRQ(ierr); 29 ierr = MatSetType(*mat,newtype);CHKERRQ(ierr); 30 31 for (i=0; i<M; i++) { 32 ierr = VecSet(&zero,in);CHKERRQ(ierr); 33 ierr = VecSetValues(in,1,&i,&one,INSERT_VALUES);CHKERRQ(ierr); 34 ierr = VecAssemblyBegin(in);CHKERRQ(ierr); 35 ierr = VecAssemblyEnd(in);CHKERRQ(ierr); 36 37 ierr = MatMult(oldmat,in,out);CHKERRQ(ierr); 38 39 ierr = VecGetArray(out,&array);CHKERRQ(ierr); 40 ierr = MatSetValues(*mat,m,rows,1,&i,array,INSERT_VALUES);CHKERRQ(ierr); 41 ierr = VecRestoreArray(out,&array);CHKERRQ(ierr); 42 43 } 44 ierr = PetscFree(rows);CHKERRQ(ierr); 45 ierr = VecDestroy(in);CHKERRQ(ierr); 46 ierr = VecDestroy(out);CHKERRQ(ierr); 47 ierr = MatAssemblyBegin(*mat,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 48 ierr = MatAssemblyEnd(*mat,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 49 PetscFunctionReturn(0); 50 } 51 52 53 54