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122 lines
3.9 KiB
Fortran
122 lines
3.9 KiB
Fortran
!!$
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!!$ Parallel Sparse BLAS version 2.2
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!!$ (C) Copyright 2006/2007/2008
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!!$ Salvatore Filippone University of Rome Tor Vergata
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!!$ Alfredo Buttari University of Rome Tor Vergata
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!!$
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!!$ Redistribution and use in source and binary forms, with or without
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!!$ modification, are permitted provided that the following conditions
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!!$ are met:
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!!$ 1. Redistributions of source code must retain the above copyright
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!!$ notice, this list of conditions and the following disclaimer.
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!!$ 2. Redistributions in binary form must reproduce the above copyright
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!!$ notice, this list of conditions, and the following disclaimer in the
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!!$ documentation and/or other materials provided with the distribution.
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!!$ 3. The name of the PSBLAS group or the names of its contributors may
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!!$ not be used to endorse or promote products derived from this
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!!$ software without specific written permission.
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!!$
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!!$ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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!!$ ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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!!$ TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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!!$ PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PSBLAS GROUP OR ITS CONTRIBUTORS
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!!$ BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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!!$ CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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!!$ SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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!!$ INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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!!$ CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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!!$ ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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!!$ POSSIBILITY OF SUCH DAMAGE.
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!!$
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!!$
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! File: psb_cneigh.f90
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! Subroutine:
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! Arguments:
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subroutine psb_cneigh(a,idx,neigh,n,info,lev)
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use psb_realloc_mod
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use psb_const_mod
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use psb_spmat_type
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use psb_serial_mod, psb_protect_name => psb_cneigh
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implicit none
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type(psb_cspmat_type), intent(in) :: a ! the sparse matrix
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integer, intent(in) :: idx ! the index whose neighbours we want to find
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integer, intent(out) :: n, info ! the number of neighbours and the info
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integer, allocatable :: neigh(:) ! the neighbours
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integer, optional :: lev ! level of neighbours to find
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integer :: lev_, i, nl, ifl,ill,&
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& n1, err_act, nn, nidx,ntl
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character(len=20) :: name
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integer, allocatable :: ia(:), ja(:)
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complex(psb_spk_), allocatable :: val(:)
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name='psb_cneigh'
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info = 0
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call psb_erractionsave(err_act)
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n = 0
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info = 0
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if(present(lev)) then
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lev_ = lev
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else
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lev_=1
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end if
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call psb_sp_getrow(idx,a,n,ia,ja,val,info)
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if (info == 0) call psb_realloc(n,neigh,info)
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if (info /= 0) then
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call psb_errpush(4000,name)
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goto 9999
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end if
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neigh(1:n) = ja(1:n)
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ifl = 1
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ill = n
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do nl = 2, lev_
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n1 = ill - ifl + 1
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call psb_ensure_size(ill+n1*n1,neigh,info)
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if (info /= 0) then
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call psb_errpush(4000,name)
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goto 9999
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end if
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ntl = 0
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do i=ifl,ill
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nidx=neigh(i)
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if ((nidx /= idx).and.(nidx > 0).and.(nidx <= a%m)) then
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call psb_sp_getrow(nidx,a,nn,ia,ja,val,info)
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if (info==0) call psb_ensure_size(ill+ntl+nn,neigh,info)
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if (info /= 0) then
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call psb_errpush(4000,name)
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goto 9999
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end if
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neigh(ill+ntl+1:ill+ntl+nn)=ja(1:nn)
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ntl = ntl+nn
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end if
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end do
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call psb_msort_unique(neigh(ill+1:ill+ntl),nn)
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ifl = ill + 1
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ill = ill + nn
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end do
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call imsru(ill,neigh,psb_sort_up_,nn)
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n = nn
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call psb_erractionrestore(err_act)
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return
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9999 continue
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call psb_erractionrestore(err_act)
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if (err_act == psb_act_abort_) then
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call psb_error()
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return
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end if
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return
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end subroutine psb_cneigh
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