1 /*$Id: convert.c,v 1.76 2001/08/07 03:03:20 balay Exp $*/ 2 3 #include "src/mat/matimpl.h" 4 5 #undef __FUNCT__ 6 #define __FUNCT__ "MatConvert_Basic" 7 /* 8 MatConvert_Basic - Converts from any input format to another format. For 9 parallel formats, the new matrix distribution is determined by PETSc. 10 11 Does not do preallocation so in general will be slow 12 */ 13 int MatConvert_Basic(Mat mat,const MatType newtype,Mat *newmat) { 14 Mat M; 15 PetscScalar *vwork; 16 int ierr,i,nz,m,n,*cwork,rstart,rend,lm,ln; 17 18 PetscFunctionBegin; 19 ierr = MatGetSize(mat,&m,&n);CHKERRQ(ierr); 20 ierr = MatGetLocalSize(mat,&lm,&ln);CHKERRQ(ierr); 21 22 if (ln == n) ln = PETSC_DECIDE; /* try to preserve column ownership */ 23 24 ierr = MatCreate(mat->comm,lm,ln,m,n,&M);CHKERRQ(ierr); 25 ierr = MatSetType(M,newtype);CHKERRQ(ierr); 26 27 ierr = MatGetOwnershipRange(mat,&rstart,&rend);CHKERRQ(ierr); 28 for (i=rstart; i<rend; i++) { 29 ierr = MatGetRow(mat,i,&nz,&cwork,&vwork);CHKERRQ(ierr); 30 ierr = MatSetValues(M,1,&i,nz,cwork,vwork,INSERT_VALUES);CHKERRQ(ierr); 31 ierr = MatRestoreRow(mat,i,&nz,&cwork,&vwork);CHKERRQ(ierr); 32 } 33 ierr = MatAssemblyBegin(M,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 34 ierr = MatAssemblyEnd(M,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 35 36 /* Fake support for "inplace" convert. */ 37 if (*newmat == mat) { 38 ierr = MatDestroy(mat);CHKERRQ(ierr); 39 } 40 *newmat = M; 41 PetscFunctionReturn(0); 42 } 43