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121 lines
3.8 KiB
Fortran
121 lines
3.8 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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subroutine psb_cdiagsc_bld(a,desc_a,p,upd,info)
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use psb_base_mod
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use psb_prec_mod, psb_protect_name => psb_cdiagsc_bld
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Implicit None
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type(psb_c_sparse_mat), intent(in), target :: a
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type(psb_desc_type), intent(in) :: desc_a
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type(psb_cprec_type),intent(inout) :: p
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character, intent(in) :: upd
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integer, intent(out) :: info
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! Local scalars
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Integer :: err, n_row, n_col,I,ictxt,&
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& me,np,mglob,err_act
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integer :: int_err(5)
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integer,parameter :: iroot=psb_root_,iout=60,ilout=40
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character(len=20) :: name, ch_err
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if(psb_get_errstatus() /= 0) return
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info=0
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err=0
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call psb_erractionsave(err_act)
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name = 'psb_diagsc_bld'
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info = 0
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int_err(1) = 0
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ictxt = psb_cd_get_context(desc_a)
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n_row = psb_cd_get_local_rows(desc_a)
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n_col = psb_cd_get_local_cols(desc_a)
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mglob = psb_cd_get_global_rows(desc_a)
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call psb_info(ictxt, me, np)
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! diagonal scaling
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call psb_realloc(n_col,p%d,info)
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if (info /= 0) then
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call psb_errpush(4010,name,a_err='psb_realloc')
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goto 9999
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end if
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!
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! Retrieve the diagonal entries of the matrix A
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!
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call a%get_diag(p%d,info)
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if(info /= 0) then
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info=4010
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ch_err='psb_sp_getdiag'
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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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!
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! Copy into p%desc_data the descriptor associated to A
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!
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call psb_cdcpy(desc_a,p%desc_Data,info)
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if (info /= 0) then
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call psb_errpush(4010,name,a_err='psb_cdcpy')
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goto 9999
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end if
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!
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! The i-th diagonal entry of the preconditioner is set to one if the
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! corresponding entry a_ii of the sparse matrix A is zero; otherwise
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! it is set to one/a_ii
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!
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do i=1,n_row
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if (p%d(i) == czero) then
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p%d(i) = cone
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else
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p%d(i) = cone/p%d(i)
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endif
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end do
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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_cdiagsc_bld
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