psblas3/base/internals/psi_exist_ovr_elem.f90

!
!             Parallel Sparse BLAS  version 3.5
!   (C) Copyright 2006, 2010, 2015, 2017
!       Salvatore Filippone     
!       Alfredo Buttari        CNRS-IRIT, Toulouse
!
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! 
integer function psi_exist_ovr_elem(ovr_elem, dim_list,elem_searched)
  use psb_const_mod
  !    PURPOSE:
  !    == = ====
  !
  !    If ELEM_SEARCHED exist in the list OVR_ELEM returns its position in
  !    the list, else returns -1
  !
  !
  !     INPUT
  !     == = ===
  !     OVRLAP_ELEMENT_D.: Contains for all overlap points belonging to 
  !                        the current process:
  !                          1. overlap point index
  !                          2. Number of domains sharing that overlap point
  !                        the end is marked by a -1...............................
  !
  !    DIM_LIST..........: Dimension of list OVRLAP_ELEMENT_D
  !
  !    ELEM_SEARCHED.....:point's  Local index identifier to be searched.

  implicit none

  !     ....Scalars parameters....
  integer(psb_ipk_) :: dim_list,elem_searched
  !     ...array parameters....
  integer(psb_ipk_) :: ovr_elem(dim_list,*)

  !     ...local scalars....
  integer(psb_ipk_) :: i

  i=1
  do while ((i.le.dim_list).and.(ovr_elem(i,1).ne.elem_searched))
    i=i+1
  enddo
  if ((i.le.dim_list).and.(ovr_elem(i,1).eq.elem_searched)) then
    psi_exist_ovr_elem=i
  else
    psi_exist_ovr_elem=-1
  endif
end function psi_exist_ovr_elem