1 /*$Id: shellcnv.c,v 1.20 2001/08/07 03:02:51 balay Exp $*/ 2 3 #include "src/mat/matimpl.h" /*I "petscmat.h" I*/ 4 #include "vecimpl.h" 5 6 #undef __FUNCT__ 7 #define __FUNCT__ "MatConvert_Shell" 8 int MatConvert_Shell(Mat oldmat,const MatType newtype,Mat *newmat) { 9 Mat mat; 10 Vec in,out; 11 int ierr,i,M,m,*rows,start,end; 12 MPI_Comm comm; 13 PetscScalar *array,zero = 0.0,one = 1.0; 14 15 PetscFunctionBegin; 16 comm = oldmat->comm; 17 18 ierr = MatGetOwnershipRange(oldmat,&start,&end);CHKERRQ(ierr); 19 ierr = VecCreateMPI(comm,end-start,PETSC_DECIDE,&in);CHKERRQ(ierr); 20 ierr = VecDuplicate(in,&out);CHKERRQ(ierr); 21 ierr = VecGetSize(in,&M);CHKERRQ(ierr); 22 ierr = VecGetLocalSize(in,&m);CHKERRQ(ierr); 23 ierr = PetscMalloc((m+1)*sizeof(int),&rows);CHKERRQ(ierr); 24 for (i=0; i<m; i++) {rows[i] = start + i;} 25 26 ierr = MatCreate(comm,m,M,M,M,&mat);CHKERRQ(ierr); 27 ierr = MatSetType(mat,newtype);CHKERRQ(ierr); 28 29 for (i=0; i<M; i++) { 30 ierr = VecSet(&zero,in);CHKERRQ(ierr); 31 ierr = VecSetValues(in,1,&i,&one,INSERT_VALUES);CHKERRQ(ierr); 32 ierr = VecAssemblyBegin(in);CHKERRQ(ierr); 33 ierr = VecAssemblyEnd(in);CHKERRQ(ierr); 34 35 ierr = MatMult(oldmat,in,out);CHKERRQ(ierr); 36 37 ierr = VecGetArray(out,&array);CHKERRQ(ierr); 38 ierr = MatSetValues(mat,m,rows,1,&i,array,INSERT_VALUES);CHKERRQ(ierr); 39 ierr = VecRestoreArray(out,&array);CHKERRQ(ierr); 40 41 } 42 ierr = PetscFree(rows);CHKERRQ(ierr); 43 ierr = VecDestroy(in);CHKERRQ(ierr); 44 ierr = VecDestroy(out);CHKERRQ(ierr); 45 ierr = MatAssemblyBegin(mat,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 46 ierr = MatAssemblyEnd(mat,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 47 48 /* Fake support for "inplace" convert. */ 49 if (*newmat == oldmat) { 50 ierr = MatDestroy(oldmat);CHKERRQ(ierr); 51 } 52 *newmat = mat; 53 PetscFunctionReturn(0); 54 } 55 56 57 58