void
SolverLinearPetsc<T>::getResidualHistory( std::vector<double>& hist )
{
int ierr = 0;
int its = 0;
// Fill the residual history vector with the residual norms
// Note that GetResidualHistory() does not copy any values, it
// simply sets the pointer p. Note that for some Krylov subspace
// methods, the number of residuals returned in the history
// vector may be different from what you are expecting. For
// example, TFQMR returns two residual values per iteration step.
double* p;
ierr = KSPGetResidualHistory( M_ksp, &p, &its );
CHKERRABORT( this->worldComm().globalComm(),ierr );
// Check for early return
if ( its == 0 ) return;
// Create space to store the result
hist.resize( its );
// Copy history into the vector provided by the user.
for ( int i=0; i<its; ++i )
{
hist[i] = *p;
p++;
}
}
typename SolverLinearPetsc<T>::real_type
SolverLinearPetsc<T>::getInitialResidual()
{
int ierr = 0;
int its = 0;
// Fill the residual history vector with the residual norms
// Note that GetResidualHistory() does not copy any values, it
// simply sets the pointer p. Note that for some Krylov subspace
// methods, the number of residuals returned in the history
// vector may be different from what you are expecting. For
// example, TFQMR returns two residual values per iteration step.
double* p;
ierr = KSPGetResidualHistory( M_ksp, &p, &its );
CHKERRABORT( this->worldComm().globalComm(),ierr );
// Check no residual history
if ( its == 0 )
{
std::cerr << "No iterations have been performed, returning 0." << std::endl;
return 0.;
}
// Otherwise, return the value pointed to by p.
return *p;
}
#include <petscksp.h>
#include <petsc/private/f90impl.h>
#if defined(PETSC_HAVE_FORTRAN_CAPS)
#define kspgetresidualhistoryf90_ KSPGETRESIDUALHISTORYF90
#elif !defined(PETSC_HAVE_FORTRAN_UNDERSCORE)
#define kspgetresidualhistoryf90_ kspgetresidualhistoryf90
#endif
PETSC_EXTERN void PETSC_STDCALL kspgetresidualhistoryf90_(KSP *ksp,F90Array1d *indices,PetscInt *n,int *ierr PETSC_F90_2PTR_PROTO(ptrd))
{
PetscReal *hist;
*ierr = KSPGetResidualHistory(*ksp,&hist,n); if (*ierr) return;
*ierr = F90Array1dCreate(hist,PETSC_DOUBLE,1,*n,indices PETSC_F90_2PTR_PARAM(ptrd));
}