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480 lines
12 KiB
Fortran
480 lines
12 KiB
Fortran
! File: psb_ddot.f90
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!
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! Function: psb_ddot
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! psb_ddot forms the dot product of two distributed vectors,
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!
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! dot := sub( X )**T * sub( Y )
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!
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! where sub( X ) denotes X(:,JX)
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!
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! sub( Y ) denotes Y(:,JY).
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!
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! Parameters:
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! x - real,dimension(:,:). The input vector containing the entries of sub( X ).
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! y - real,dimension(:,:). The input vector containing the entries of sub( Y ).
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! desc_a - type(<psb_desc_type>). The communication descriptor.
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! info - integer. Eventually returns an error code.
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! jx - integer(optional). The column offset for sub( X ).
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! jy - integer(optional). The column offset for sub( Y ).
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!
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function psb_ddot(x, y,desc_a, info, jx, jy)
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use psb_descriptor_type
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use psb_check_mod
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use psb_error_mod
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implicit none
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real(kind(1.d0)), intent(in) :: x(:,:), y(:,:)
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type(psb_desc_type), intent(in) :: desc_a
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integer, intent(in), optional :: jx, jy
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integer, intent(out) :: info
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real(kind(1.D0)) :: psb_ddot
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! locals
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integer :: int_err(5), icontxt, nprow, npcol, myrow, mycol,&
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& err_act, n, iix, jjx, temp(2), ix, ijx, iy, ijy, iiy, jjy, i, m, j, k
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real(kind(1.d0)),pointer :: tmpx(:)
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real(kind(1.D0)) :: dot_local
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real(kind(1.d0)) :: ddot
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character(len=20) :: name, ch_err
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name='psb_ddot'
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info=0
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call psb_erractionsave(err_act)
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icontxt=desc_a%matrix_data(psb_ctxt_)
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! check on blacs grid
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call blacs_gridinfo(icontxt, nprow, npcol, myrow, mycol)
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if (nprow == -ione) then
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info = 2010
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call psb_errpush(info,name)
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goto 9999
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else if (npcol /= ione) then
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info = 2030
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int_err(1) = npcol
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call psb_errpush(info,name)
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goto 9999
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endif
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ix = ione
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if (present(jx)) then
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ijx = jx
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else
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ijx = ione
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endif
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iy = ione
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if (present(jy)) then
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ijy = jy
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else
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ijy = ione
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endif
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if(ijx.ne.ijy) then
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info=3050
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call psb_errpush(info,name)
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goto 9999
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end if
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m = desc_a%matrix_data(psb_m_)
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! check vector correctness
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call psb_chkvect(m,ione,size(x,1),ix,ijx,desc_a%matrix_data,info,iix,jjx)
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call psb_chkvect(m,ione,size(y,1),iy,ijy,desc_a%matrix_data,info,iiy,jjy)
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if(info.ne.0) then
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info=4010
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ch_err='psb_chkvect'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
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if ((iix.ne.ione).or.(iiy.ne.ione)) then
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info=3040
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call psb_errpush(info,name)
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goto 9999
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end if
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if(m.ne.0) then
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if(desc_a%matrix_data(psb_n_row_).gt.0) then
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dot_local = ddot(desc_a%matrix_data(psb_n_row_),&
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& x(iix,jjx),ione,y(iiy,jjy),ione)
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! adjust dot_local because overlapped elements are computed more than once
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i=1
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do while (desc_a%ovrlap_elem(i).ne.-ione)
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dot_local = dot_local -&
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& (desc_a%ovrlap_elem(i+1)-1)/desc_a%ovrlap_elem(i+1)*&
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& x(iix+desc_a%ovrlap_elem(i)-1,jjx)*&
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& y(iiy+desc_a%ovrlap_elem(i)-1,jjy)
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i = i+2
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end do
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else
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dot_local=0.d0
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end if
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else
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dot_local=0.d0
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end if
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! compute global sum
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call dgsum2d(icontxt, 'A', ' ', ione, ione, dot_local,&
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& ione, mone ,mycol)
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psb_ddot = dot_local
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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(icontxt)
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return
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end if
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return
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end function psb_ddot
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! Function: psb_ddotv
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! psb_ddot forms the dot product of two distributed vectors,
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!
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! dot := X**T * Y
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!
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! Parameters:
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! x - real,dimension(:). The input vector containing the entries of X.
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! y - real,dimension(:). The input vector containing the entries of Y.
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! desc_a - type(<psb_desc_type>). The communication descriptor.
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! info - integer. Eventually returns an error code.
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!
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function psb_ddotv(x, y,desc_a, info)
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use psb_descriptor_type
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use psb_check_mod
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use psb_error_mod
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implicit none
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real(kind(1.d0)), intent(in) :: x(:), y(:)
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type(psb_desc_type), intent(in) :: desc_a
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integer, intent(out) :: info
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real(kind(1.D0)) :: psb_ddotv
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! locals
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integer :: int_err(5), icontxt, nprow, npcol, myrow, mycol,&
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& err_act, n, iix, jjx, temp(2), ix, jx, iy, jy, iiy, jjy, i, m, j, k
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real(kind(1.d0)),pointer :: tmpx(:)
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real(kind(1.D0)) :: dot_local
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real(kind(1.d0)) :: ddot
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character(len=20) :: name, ch_err
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name='psb_ddot'
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info=0
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call psb_erractionsave(err_act)
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icontxt=desc_a%matrix_data(psb_ctxt_)
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! check on blacs grid
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call blacs_gridinfo(icontxt, nprow, npcol, myrow, mycol)
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if (nprow == -ione) then
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info = 2010
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call psb_errpush(info,name)
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goto 9999
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else if (npcol /= ione) then
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info = 2030
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int_err(1) = npcol
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call psb_errpush(info,name)
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goto 9999
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endif
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ix = ione
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iy = ione
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jx = ione
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jy = ione
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m = desc_a%matrix_data(psb_m_)
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! check vector correctness
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call psb_chkvect(m,ione,size(x,1),ix,jx,desc_a%matrix_data,info,iix,jjx)
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call psb_chkvect(m,ione,size(y,1),iy,jy,desc_a%matrix_data,info,iiy,jjy)
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if(info.ne.0) then
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info=4010
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ch_err='psb_chkvect'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
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if ((iix.ne.ione).or.(iiy.ne.ione)) then
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info=3040
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call psb_errpush(info,name)
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goto 9999
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end if
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if(m.ne.0) then
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if(desc_a%matrix_data(psb_n_row_).gt.0) then
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dot_local = ddot(desc_a%matrix_data(psb_n_row_),&
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& x,ione,y,ione)
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! adjust dot_local because overlapped elements are computed more than once
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i=1
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do while (desc_a%ovrlap_elem(i).ne.-ione)
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dot_local = dot_local -&
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& (desc_a%ovrlap_elem(i+1)-1)/desc_a%ovrlap_elem(i+1)*&
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& x(desc_a%ovrlap_elem(i))*&
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& y(desc_a%ovrlap_elem(i))
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i = i+2
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end do
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else
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dot_local=0.d0
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end if
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else
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dot_local=0.d0
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end if
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! compute global sum
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call dgsum2d(icontxt, 'A', ' ', ione, ione, dot_local,&
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& ione, mone ,mycol)
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psb_ddotv = dot_local
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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(icontxt)
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return
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end if
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return
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end function psb_ddotv
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! Subroutine: psb_ddotvs
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! psb_ddot forms the dot product of two distributed vectors,
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!
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! dot := X**T * Y
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!
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! Parameters:
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! res - real. The result.
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! x - real,dimension(:). The input vector containing the entries of X.
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! y - real,dimension(:). The input vector containing the entries of Y.
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! desc_a - type(<psb_desc_type>). The communication descriptor.
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! info - integer. Eventually returns an error code.
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!
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subroutine psb_ddotvs(res, x, y,desc_a, info)
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use psb_descriptor_type
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use psb_check_mod
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use psb_error_mod
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implicit none
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real(kind(1.d0)), intent(in) :: x(:), y(:)
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real(kind(1.d0)), intent(out) :: res
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type(psb_desc_type), intent(in) :: desc_a
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integer, intent(out) :: info
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! locals
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integer :: int_err(5), icontxt, nprow, npcol, myrow, mycol,&
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& err_act, n, iix, jjx, temp(2), ix, ijx, iy, ijy, iiy, jjy, i, m, j, k
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real(kind(1.d0)),pointer :: tmpx(:)
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real(kind(1.D0)) :: dot_local
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real(kind(1.d0)) :: ddot
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character(len=20) :: name, ch_err
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name='psb_ddot'
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info=0
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call psb_erractionsave(err_act)
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icontxt=desc_a%matrix_data(psb_ctxt_)
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! check on blacs grid
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call blacs_gridinfo(icontxt, nprow, npcol, myrow, mycol)
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if (nprow == -ione) then
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info = 2010
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call psb_errpush(info,name)
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goto 9999
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else if (npcol /= ione) then
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info = 2030
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int_err(1) = npcol
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call psb_errpush(info,name)
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goto 9999
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endif
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ix = ione
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iy = ione
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m = desc_a%matrix_data(psb_m_)
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! check vector correctness
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call psb_chkvect(m,ione,size(x,1),ix,ijx,desc_a%matrix_data,info,iix,jjx)
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call psb_chkvect(m,ione,size(y,1),iy,ijy,desc_a%matrix_data,info,iiy,jjy)
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if(info.ne.0) then
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info=4010
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ch_err='psb_chkvect'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
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if ((iix.ne.ione).or.(iiy.ne.ione)) then
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info=3040
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call psb_errpush(info,name)
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goto 9999
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end if
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if(m.ne.0) then
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if(desc_a%matrix_data(psb_n_row_).gt.0) then
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dot_local = ddot(desc_a%matrix_data(psb_n_row_),&
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& x,ione,y,ione)
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! adjust dot_local because overlapped elements are computed more than once
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i=1
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do while (desc_a%ovrlap_elem(i).ne.-ione)
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dot_local = dot_local -&
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& (desc_a%ovrlap_elem(i+1)-1)/desc_a%ovrlap_elem(i+1)*&
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& x(desc_a%ovrlap_elem(i))*&
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& y(desc_a%ovrlap_elem(i))
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i = i+2
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end do
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else
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dot_local=0.d0
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end if
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else
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dot_local=0.d0
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end if
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! compute global sum
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call dgsum2d(icontxt, 'A', ' ', ione, ione, dot_local,&
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& ione, mone ,mycol)
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res = dot_local
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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(icontxt)
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return
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end if
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return
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end subroutine psb_ddotvs
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! Subroutine: psb_dmdots
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! psb_ddot forms the dot product of two distributed vectors,
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!
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! dot := sub( X )**T * sub( Y )
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!
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! where sub( X ) denotes X(:,JX)
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!
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! sub( Y ) denotes Y(:,JY).
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!
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! Parameters:
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! res - real. The result.
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! x - real,dimension(:,:). The input vector containing the entries of sub( X ).
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! y - real,dimension(:,:). The input vector containing the entries of sub( Y ).
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! desc_a - type(<psb_desc_type>). The communication descriptor.
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! info - integer. Eventually returns an error code.
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!
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subroutine psb_dmdots(res, x, y, desc_a, info)
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use psb_descriptor_type
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use psb_check_mod
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use psb_error_mod
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implicit none
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real(kind(1.d0)), intent(in) :: x(:,:), y(:,:)
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real(kind(1.d0)), intent(out) :: res(:)
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type(psb_desc_type), intent(in) :: desc_a
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integer, intent(out) :: info
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! locals
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integer :: int_err(5), icontxt, nprow, npcol, myrow, mycol,&
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& err_act, n, iix, jjx, temp(2), ix, ijx, iy, ijy, iiy, jjy, i, m, j, k
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real(kind(1.d0)),pointer :: dot_local(:)
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real(kind(1.d0)) :: ddot
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character(len=20) :: name, ch_err
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name='psb_dmdots'
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info=0
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call psb_erractionsave(err_act)
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icontxt=desc_a%matrix_data(psb_ctxt_)
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! check on blacs grid
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call blacs_gridinfo(icontxt, nprow, npcol, myrow, mycol)
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if (nprow == -ione) then
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info = 2010
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call psb_errpush(info,name)
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goto 9999
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else if (npcol /= ione) then
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info = 2030
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int_err(1) = npcol
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call psb_errpush(info,name)
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goto 9999
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endif
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ix = ione
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iy = ione
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m = desc_a%matrix_data(psb_m_)
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! check vector correctness
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call psb_chkvect(m,ione,size(x,1),ix,ijx,desc_a%matrix_data,info,iix,jjx)
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call psb_chkvect(m,ione,size(y,1),iy,ijy,desc_a%matrix_data,info,iiy,jjy)
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if(info.ne.0) then
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info=4010
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ch_err='psb_chkvect'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
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if ((iix.ne.ione).or.(iiy.ne.ione)) then
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info=3040
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call psb_errpush(info,name)
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goto 9999
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end if
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k = min(size(x,2),size(y,2))
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allocate(dot_local(k))
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if(m.ne.0) then
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if(desc_a%matrix_data(psb_n_row_).gt.0) then
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do j=1,k
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dot_local(j) = ddot(desc_a%matrix_data(psb_n_row_),&
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& x(iix,jjx+j-1),ione,y(iiy,jjy+j-1),ione)
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! adjust dot_local because overlapped elements are computed more than once
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i=1
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do while (desc_a%ovrlap_elem(i).ne.-ione)
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dot_local(j) = dot_local(j) -&
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& (desc_a%ovrlap_elem(i+1)-1)/desc_a%ovrlap_elem(i+1)*&
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& x(iix+desc_a%ovrlap_elem(i)-1,jjx+j-1)*&
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& y(iiy+desc_a%ovrlap_elem(i)-1,jjy+j-1)
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i = i+2
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end do
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end do
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else
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dot_local(:)=0.d0
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end if
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else
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dot_local(:)=0.d0
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end if
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! compute global sum
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call dgsum2d(icontxt, 'A', ' ', ione, ione, dot_local,&
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& ione, mone ,mycol)
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res(1:k) = dot_local(1:k)
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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(icontxt)
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return
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end if
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return
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end subroutine psb_dmdots
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