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! File: psb_daxpby.f90
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!
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! Subroutine: psb_daxpby
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! Adds one distributed matrix to another,
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!
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! sub( Y ) := beta * sub( Y ) + alpha * sub( X )
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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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! alpha - real. The scalar used to multiply each component of sub( X ).
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! x - real,dimension(:,:). The input vector containing the entries of sub( X ).
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! beta - real. The scalar used to multiply each component of sub( Y ).
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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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subroutine psb_daxpby(alpha, x, beta,y,desc_a,info, n, 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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integer, intent(in), optional :: n, jx, jy
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integer, intent(out) :: info
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type(psb_desc_type), intent(in) :: desc_a
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real(kind(1.D0)), intent(in) :: alpha, beta
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real(kind(1.D0)), intent(in) :: x(:,:)
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real(kind(1.D0)), intent(inout) :: y(:,:)
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! locals
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integer :: int_err(5), icontxt, nprow, npcol, myrow, mycol,&
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& err_act, iix, jjx, temp(2), ix, iy, ijx, ijy, m, iiy, in, jjy
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real(kind(1.d0)),pointer :: tmpx(:)
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character(len=20) :: name, ch_err
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name='psb_daxpby'
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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 (present(n)) then
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if(((ijx+n).le.size(x,2)).and.&
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& ((ijy+n).le.size(y,2))) then
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in = n
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else
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in = min(size(x,2),size(y,2))
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end if
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else
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in = min(size(x,2),size(y,2))
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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 ((in.ne.0)) then
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if(desc_a%matrix_data(psb_n_row_).gt.0) then
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call daxpby(desc_a%matrix_data(psb_n_col_),in,&
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& alpha,x(iix,jjx),size(x,1),beta,&
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& y(iiy,jjy),size(y,1),info)
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end if
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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(icontxt)
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return
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end if
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return
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end subroutine psb_daxpby
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!
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! Subroutine: psb_daxpbyv
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! Adds one distributed matrix to another,
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!
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! Y := beta * Y + alpha * X
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!
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! Parameters:
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! alpha - real. The scalar used to multiply each component of X.
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! x - real,dimension(:). The input vector containing the entries of X.
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! beta - real. The scalar used to multiply each component of Y.
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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_daxpbyv(alpha, x, beta,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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integer, intent(out) :: info
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type(psb_desc_type), intent(in) :: desc_a
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real(kind(1.D0)), intent(in) :: alpha, beta
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real(kind(1.D0)), intent(in) :: x(:)
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real(kind(1.D0)), intent(inout) :: y(:)
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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, iy, ijx, m, iiy, in, jjy
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character(len=20) :: name, ch_err
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name='psb_daxpby'
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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),ix,ione,desc_a%matrix_data,info,iix,jjx)
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call psb_chkvect(m,ione,size(y),iy,ione,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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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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end if
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write(0,'(i2," before daxpby",2(i6,2x),2(f10.2,2x))')myrow,desc_a%matrix_data(psb_n_row_),&
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& desc_a%matrix_data(psb_n_col_),alpha,beta
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if(desc_a%matrix_data(psb_n_row_).gt.0) then
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call daxpby(desc_a%matrix_data(psb_n_col_),ione,&
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& alpha,x,size(x),beta,&
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& y,size(y),info)
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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(icontxt)
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return
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end if
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return
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end subroutine psb_daxpbyv
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