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284 lines
7.3 KiB
Fortran
284 lines
7.3 KiB
Fortran
! File: psb_dneigh.f90
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! Subroutine:
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! Parameters:
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subroutine psb_dneigh(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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implicit none
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type(psb_dspmat_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, pointer :: neigh(:) ! the neighbours
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integer, optional :: lev ! level of neighbours to find
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integer, pointer :: tmpn(:)=>null()
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integer :: level, dim, i, j, k, r, c, brow,&
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& elem_pt, ii, n1, col_idx, ne, err_act, nn, nidx
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character(len=20) :: name, ch_err
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name='psb_dneigh'
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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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if(lev.le.2) then
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level=lev
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else
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write(0,'("Too many levels!!!")')
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return
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endif
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else
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level=1
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end if
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call psb_dneigh1l(a,idx,neigh,n)
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if(level.eq.2) then
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allocate(tmpn(1))
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n1=n
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do i=1,n1
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nidx=neigh(i)
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if((nidx.ne.idx).and.(nidx.gt.0).and.(nidx.le.a%m)) then
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call psb_dneigh1l(a,nidx,tmpn,nn)
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if((n+nn).gt.size(neigh)) call psb_realloc(n+nn,neigh,info)
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neigh(n+1:n+nn)=tmpn(1:nn)
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n=n+nn
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end if
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end do
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deallocate(tmpn)
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end if
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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.eq.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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contains
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subroutine psb_dneigh1l(a,idx,neigh,n)
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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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implicit none
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type(psb_dspmat_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 ! the number of neighbours and the info
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integer, pointer :: neigh(:) ! the neighbours
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select case(a%fida(1:3))
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case('CSR')
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call csr_dneigh1l(a,idx,neigh,n)
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case('COO')
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call coo_dneigh1l(a,idx,neigh,n)
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case('JAD')
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call jad_dneigh1l(a,idx,neigh,n)
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end select
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end subroutine psb_dneigh1l
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subroutine csr_dneigh1l(a,idx,neigh,n)
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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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implicit none
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type(psb_dspmat_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 ! the number of neighbours and the info
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integer, pointer :: neigh(:) ! the neighbours
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integer :: dim, i, iidx
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if(a%pl(1).ne.0) then
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iidx=a%pl(idx)
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else
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iidx=idx
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end if
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dim=a%ia2(iidx+1)-a%ia2(iidx)
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if(dim.gt.size(neigh)) call psb_realloc(dim,neigh,info)
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n=0
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do i=a%ia2(iidx), a%ia2(iidx+1)-1
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n=n+1
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neigh(n)=a%ia1(i)
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end do
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end subroutine csr_dneigh1l
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subroutine coo_dneigh1l(a,idx,neigh,n)
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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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implicit none
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type(psb_dspmat_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 ! the number of neighbours and the info
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integer, pointer :: neigh(:) ! the neighbours
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integer :: dim, i, iidx, ip, nza
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if(a%pl(1).ne.0) then
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iidx=a%pl(idx)
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else
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iidx=idx
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end if
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nza=a%infoa(psb_nnz_)
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if (a%infoa(psb_srtd_) == psb_isrtdcoo_) then
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call ibsrch(ip,iidx,nza,a%ia1)
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if (ip /= -1) then
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! bring ip backward to the beginning of the row
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do
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if (ip < 2) exit
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if (a%ia1(ip-1) == iidx) then
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ip = ip -1
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else
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exit
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end if
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end do
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end if
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dim=0
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do
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if(a%ia1(ip).eq.iidx) then
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dim=dim+1
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if(dim.gt.size(neigh)) call psb_realloc(dim*3/2,neigh,info)
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neigh(dim)=a%ia2(ip)
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ip=ip+1
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else
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exit
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end if
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end do
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else
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dim=0
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do i=1,nza
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if(a%ia1(i).eq.iidx) then
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dim=dim+1
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if(dim.gt.size(neigh)) call psb_realloc(dim*3/2,neigh,info)
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neigh(dim)=a%ia2(ip)
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end if
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end do
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end if
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n=dim
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end subroutine coo_dneigh1l
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subroutine jad_dneigh1l(a,idx,neigh,n)
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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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implicit none
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type(psb_dspmat_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 ! the number of neighbours and the info
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integer, pointer :: neigh(:) ! the neighbours
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integer :: dim, i, iidx, ip, nza
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integer, pointer :: ia1(:), ia2(:), ia3(:),&
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& ja(:), ka(:)
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integer :: png, pia, pja, ipx, blk, rb, row, k_pt, npg, col, ng
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if(a%pl(1).ne.0) then
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iidx=a%pl(idx)
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else
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iidx=idx
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end if
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nza=a%infoa(psb_nnz_)
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png = a%ia2(1) ! points to the number of blocks
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pia = a%ia2(2) ! points to the beginning of ia(3,png)
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pja = a%ia2(3) ! points to the beginning of ja(:)
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ng = a%ia2(png) ! the number of blocks
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ja => a%ia2(pja:) ! the array containing the pointers to ka and aspk
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ka => a%ia1(:) ! the array containing the column indices
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ia1 => a%ia2(pia:pja-1:3) ! the array containing the first row index of each block
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ia2 => a%ia2(pia+1:pja-1:3) ! the array containing a pointer to the pos. in ja to the first jad column
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ia3 => a%ia2(pia+2:pja-1:3) ! the array containing a pointer to the pos. in ja to the first csr column
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i=0
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dim=0
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blkfnd: do
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i=i+1
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if(ia1(i).eq.iidx) then
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blk=i
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dim=dim+ia3(i)-ia2(i)
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ipx = ia1(i) ! the first row index of the block
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rb = iidx-ipx ! the row offset within the block
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row = ia3(i)+rb
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dim = dim+ja(row+1)-ja(row)
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exit blkfnd
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else if(ia1(i).gt.iidx) then
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blk=i-1
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dim=dim+ia3(i-1)-ia2(i-1)
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ipx = ia1(i-1) ! the first row index of the block
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rb = iidx-ipx ! the row offset within the block
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row = ia3(i-1)+rb
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dim = dim+ja(row+1)-ja(row)
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exit blkfnd
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end if
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end do blkfnd
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if(dim.gt.size(neigh)) call psb_realloc(dim,neigh,info)
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ipx = ia1(blk) ! the first row index of the block
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k_pt= ia2(blk) ! the pointer to the beginning of a column in ja
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rb = iidx-ipx ! the row offset within the block
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npg = ja(k_pt+1)-ja(k_pt) ! the number of rows in the block
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k=0
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do col = ia2(blk), ia3(blk)-1
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k=k+1
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neigh(k) = ka(ja(col)+rb)
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end do
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! extract second part of the row from the csr tail
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row=ia3(blk)+rb
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do j=ja(row), ja(row+1)-1
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k=k+1
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neigh(k) = ka(j)
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end do
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n=k
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end subroutine jad_dneigh1l
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end subroutine psb_dneigh
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