psblas3/base/tools/psb_dspcnv.f90

!!$ 
!!$              Parallel Sparse BLAS  v2.0
!!$    (C) Copyright 2006 Salvatore Filippone    University of Rome Tor Vergata
!!$                       Alfredo Buttari        University of Rome Tor Vergata
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! File: psb_dspcnv.f90
!
! Subroutine: psb_dspcnv
!    converts sparse matrix a into b
! 
! Parameters: 
!    a        - type(<psb_dspmat_type>).          The sparse input matrix.      
!    b        - type(<psb_dspmat_type>).          The sparse output matrix.
!    desc_a   - type(<psb_desc_type>).            The communication descriptor.
!    info     - integer.                          Eventually returns an error code.
!
subroutine psb_dspcnv(a,b,desc_a,info)

  use psb_descriptor_type
  use psb_spmat_type
  use psb_realloc_mod
  use psb_serial_mod
  use psb_const_mod
  use psb_error_mod
  use psb_penv_mod
  implicit none

  !...parameters....
  type(psb_dspmat_type), intent(in)   :: a
  type(psb_dspmat_type), intent(out)  :: b
  type(psb_desc_type), intent(in)     :: desc_a
  integer, intent(out)                :: info
  !....locals....
  integer                       ::  int_err(5)
  integer                       ::  ia1_size,ia2_size,aspk_size,err_act&
       & ,i,err,np,me,n_col
  integer, allocatable :: i_temp(:)
  integer                       ::  dectype
  integer                       ::  ictxt,n_row
  logical, parameter :: debug=.false.
  character(len=20)   :: name, ch_err

  if(psb_get_errstatus() /= 0) return 
  info=0
  name = 'psb_dspcnv'
  call psb_erractionsave(err_act)


  ictxt   = psb_cd_get_context(desc_a)
  dectype = psb_cd_get_dectype(desc_a)
  n_row   = psb_cd_get_local_rows(desc_a)
  n_col   = psb_cd_get_local_cols(desc_a)

  ! check on blacs grid 
  call psb_info(ictxt, me, np)
  if (np == -1) then
    info = 2010
    call psb_errpush(info,name)
    goto 9999
  endif

  if (.not.psb_is_ok_dec((dectype))) then
    info = 600
    int_err(1) = dectype
    call psb_errpush(info,name,i_err=int_err)
    goto 9999
  endif

  if (debug) write (0, *) name,'   begin matrix assembly...'

  ia1_size  = size(a%ia1)
  ia2_size  = size(a%ia2)
  aspk_size = size(a%aspk)

  if (debug) write (0, *) name,'  sizes',ia1_size,ia2_size,aspk_size

  b%m=n_row
  b%k=n_col
  call psb_sp_all(b,ia1_size,ia2_size,aspk_size,info)

  call psb_csdp(a,b,info)

  if(info /= no_err) then
    info=4010
    ch_err='psb_csdp'
    call psb_errpush(info, name, a_err=ch_err)
    goto 9999
  end if

  !
  !  hmmm, have to fix b%pl and b%pr according to a%pl and a%pr!!! 
  !  should work (crossed fingers :-)
  if (a%pr(1) /= 0) then 
    if (b%pr(1) /= 0) then 
      allocate(i_temp(n_col))
      do i=1,  n_col
        i_temp(i) = b%pr(a%pr(i))
      enddo
      call psb_transfer(i_temp,b%pr,info)
    else
      allocate(i_temp(n_col))
      do i=1,  n_col
        i_temp(i) = a%pr(i)
      enddo
      call psb_transfer(i_temp,b%pr,info)
    endif
  endif
  if (a%pl(1) /= 0) then 
    if (b%pr(1) /= 0) then 
      allocate(i_temp(n_row))
      do i=1,  n_row
        i_temp(i) = a%pl(b%pl(i))
      enddo
      call psb_transfer(i_temp,b%pl,info)
    else
      allocate(i_temp(n_row))
      do i=1,  n_row
        i_temp(i) = a%pl(i)
      enddo
      call psb_transfer(i_temp,b%pl,info)
    endif
  endif


  call psb_erractionrestore(err_act)
  return

9999 continue
  call psb_erractionrestore(err_act)
  if (err_act == act_abort) then
    call psb_error(ictxt)
    return
  end if
  return

end subroutine psb_dspcnv