PetscErrorCode MatGetOrdering_myordering(Mat mat,MatOrderingType type,IS *irow,IS *icol)
{
PetscErrorCode ierr;
PetscInt n,i,*ii;
PetscBool done;
MPI_Comm comm;
PetscFunctionBegin;
ierr = PetscObjectGetComm((PetscObject)mat,&comm);
CHKERRQ(ierr);
ierr = MatGetRowIJ(mat,0,PETSC_FALSE,PETSC_TRUE,&n,NULL,NULL,&done);
CHKERRQ(ierr);
ierr = MatRestoreRowIJ(mat,0,PETSC_FALSE,PETSC_TRUE,NULL,NULL,NULL,&done);
CHKERRQ(ierr);
if (done) { /* matrix may be "compressed" in symbolic factorization, due to i-nodes or block storage */
ierr = PetscMalloc(n*sizeof(PetscInt),&ii);
CHKERRQ(ierr);
for (i=0; i<n; i++) ii[i] = n-i-1; /* replace your index here */
ierr = ISCreateGeneral(PETSC_COMM_SELF,n,ii,PETSC_COPY_VALUES,irow);
CHKERRQ(ierr);
ierr = ISCreateGeneral(PETSC_COMM_SELF,n,ii,PETSC_OWN_POINTER,icol);
CHKERRQ(ierr);
} else SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_SUP,"MatRestoreRowIJ fails!");
ierr = ISSetIdentity(*irow);
CHKERRQ(ierr);
ierr = ISSetIdentity(*icol);
CHKERRQ(ierr);
ierr = ISSetPermutation(*irow);
CHKERRQ(ierr);
ierr = ISSetPermutation(*icol);
CHKERRQ(ierr);
PetscFunctionReturn(0);
}
int main(int argc,char **argv)
{
PetscMPIInt rank,size;
PetscInt i,n,*indices;
const PetscInt *ii;
IS is,newis;
PetscBool flg;
PetscErrorCode ierr;
ierr = PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;
ierr = MPI_Comm_rank(PETSC_COMM_WORLD,&rank);CHKERRQ(ierr);
ierr = MPI_Comm_size(PETSC_COMM_WORLD,&size);CHKERRQ(ierr);
/*
Test IS of size 0
*/
ierr = ISCreateGeneral(PETSC_COMM_SELF,0,&n,PETSC_COPY_VALUES,&is);CHKERRQ(ierr);
ierr = ISGetSize(is,&n);CHKERRQ(ierr);
if (n != 0) SETERRQ(PETSC_COMM_SELF,1,"ISGetSize");
ierr = ISDestroy(&is);CHKERRQ(ierr);
/*
Create large IS and test ISGetIndices()
*/
n = 10000 + rank;
ierr = PetscMalloc1(n,&indices);CHKERRQ(ierr);
for (i=0; i<n; i++) indices[i] = rank + i;
ierr = ISCreateGeneral(PETSC_COMM_SELF,n,indices,PETSC_COPY_VALUES,&is);CHKERRQ(ierr);
ierr = ISGetIndices(is,&ii);CHKERRQ(ierr);
for (i=0; i<n; i++) {
if (ii[i] != indices[i]) SETERRQ(PETSC_COMM_SELF,1,"ISGetIndices");
}
ierr = ISRestoreIndices(is,&ii);CHKERRQ(ierr);
/*
Check identity and permutation
*/
ierr = ISPermutation(is,&flg);CHKERRQ(ierr);
if (flg) SETERRQ(PETSC_COMM_SELF,1,"ISPermutation");
ierr = ISIdentity(is,&flg);CHKERRQ(ierr);
if (!flg) SETERRQ(PETSC_COMM_SELF,1,"ISIdentity");
ierr = ISSetPermutation(is);CHKERRQ(ierr);
ierr = ISSetIdentity(is);CHKERRQ(ierr);
ierr = ISPermutation(is,&flg);CHKERRQ(ierr);
if (!flg) SETERRQ(PETSC_COMM_SELF,1,"ISPermutation");
ierr = ISIdentity(is,&flg);CHKERRQ(ierr);
if (!flg) SETERRQ(PETSC_COMM_SELF,1,"ISIdentity");
/*
Check equality of index sets
*/
ierr = ISEqual(is,is,&flg);CHKERRQ(ierr);
if (!flg) SETERRQ(PETSC_COMM_SELF,1,"ISEqual");
/*
Sorting
*/
ierr = ISSort(is);CHKERRQ(ierr);
ierr = ISSorted(is,&flg);CHKERRQ(ierr);
if (!flg) SETERRQ(PETSC_COMM_SELF,1,"ISSort");
/*
Thinks it is a different type?
*/
ierr = PetscObjectTypeCompare((PetscObject)is,ISSTRIDE,&flg);CHKERRQ(ierr);
if (flg) SETERRQ(PETSC_COMM_SELF,1,"ISStride");
ierr = PetscObjectTypeCompare((PetscObject)is,ISBLOCK,&flg);CHKERRQ(ierr);
if (flg) SETERRQ(PETSC_COMM_SELF,1,"ISBlock");
ierr = ISDestroy(&is);CHKERRQ(ierr);
/*
Inverting permutation
*/
for (i=0; i<n; i++) indices[i] = n - i - 1;
ierr = ISCreateGeneral(PETSC_COMM_SELF,n,indices,PETSC_COPY_VALUES,&is);CHKERRQ(ierr);
ierr = PetscFree(indices);CHKERRQ(ierr);
ierr = ISSetPermutation(is);CHKERRQ(ierr);
ierr = ISInvertPermutation(is,PETSC_DECIDE,&newis);CHKERRQ(ierr);
ierr = ISGetIndices(newis,&ii);CHKERRQ(ierr);
for (i=0; i<n; i++) {
if (ii[i] != n - i - 1) SETERRQ(PETSC_COMM_SELF,1,"ISInvertPermutation");
}
ierr = ISRestoreIndices(newis,&ii);CHKERRQ(ierr);
ierr = ISDestroy(&newis);CHKERRQ(ierr);
ierr = ISDestroy(&is);CHKERRQ(ierr);
ierr = PetscFinalize();
return ierr;
}
void PETSC_STDCALL issetidentity_(IS is, int *__ierr ){
*__ierr = ISSetIdentity(
(IS)PetscToPointer((is) ));
}