psblas3/base/serial/psb_dspshift.f90

!!$ 
!!$              Parallel Sparse BLAS  version 2.2
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!!$                       Salvatore Filippone    University of Rome Tor Vergata
!!$                       Alfredo Buttari        University of Rome Tor Vergata
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! File:  psb_dspgtblk.f90 
! Subroutine: psb_dspgtblk
!    Gets one or more rows from a sparse matrix. 
! Arguments:
!*****************************************************************************
!*                                                                           *
!* Takes a specified row from matrix A and copies into matrix B (possibly    *
!*  appending to B). Output is always COO. Input might be anything,          *
!*                                                                           *
!*****************************************************************************
subroutine psb_dspshift(alpha,a,beta,b,info)
  ! Output is always in  COO format  into B, irrespective of 
  ! the input format 
  use psb_spmat_type
  use psb_const_mod
  use psb_string_mod
  use psb_serial_mod, psb_protect_name => psb_dspshift

  implicit none

  type(psb_dspmat_type), intent(in)  :: a
  type(psb_dspmat_type), intent(out) :: b
  real(psb_dpk_), intent(in)         :: alpha, beta
  integer, intent(out)               :: info      

  logical            :: append_,srt_
  integer            :: i,j, err_act
  character(len=20)  :: name

  name='psb_sp_shift'
  info  = 0
  call psb_erractionsave(err_act)

  call psb_sp_setbld(a,b,info)
  if (info == 0) call psb_sp_scal(b,alpha,info) 
  do i=1,min(b%m,b%k) 
    if (info == 0) call psb_coins(1,(/i/),(/i/),(/beta/),b,1,1,b%m,b%k,info)
  end do
  if (info == 0) call psb_spcnv(b,info,afmt=a%fida,dupl=psb_dupl_add_)

  if (info /= 0) then 
    call psb_errpush(4010,name,a_err='Internal call')
    goto 9999
  end if

  call psb_erractionrestore(err_act)

  return

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


end subroutine psb_dspshift