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144 lines
4.5 KiB
Fortran
144 lines
4.5 KiB
Fortran
!!$
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!!$ Parallel Sparse BLAS version 3.0
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!!$ (C) Copyright 2006, 2007, 2008, 2009, 2010
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!!$ Salvatore Filippone University of Rome Tor Vergata
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!!$ Alfredo Buttari CNRS-IRIT, Toulouse
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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_dnrmi.f90
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!
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! Function: psb_dnrmi
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! Forms the approximated norm of a sparse matrix,
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!
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! norm1 := max(sum(abs(A(:,j))))
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!
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! Arguments:
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! a - type(psb_dspmat_type). The sparse matrix containing A.
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! desc_a - type(psb_desc_type). The communication descriptor.
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! info - integer. Return code
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!
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function psb_dspnrm1(a,desc_a,info)
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!!$ use psb_descriptor_type
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!!$ use psb_serial_mod
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!!$ use psb_check_mod
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!!$ use psb_error_mod
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!!$ use psb_penv_mod
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!!$ use psb_mat_mod
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!!$ use psb_tools_mod
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use psb_base_mod, psb_protect_name => psb_dspnrm1
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implicit none
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type(psb_dspmat_type), intent(in) :: a
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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(psb_dpk_) :: psb_dspnrm1
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! locals
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integer :: ictxt, np, me, nr,nc,&
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& err_act, n, iia, jja, ia, ja, mdim, ndim, m
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real(psb_dpk_) :: nrm1
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character(len=20) :: name, ch_err
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real(psb_dpk_), allocatable :: v(:)
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name='psb_dnrm1'
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if(psb_get_errstatus() /= 0) return
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info=psb_success_
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call psb_erractionsave(err_act)
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ictxt=psb_cd_get_context(desc_a)
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call psb_info(ictxt, me, np)
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if (np == -1) then
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info = psb_err_context_error_
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call psb_errpush(info,name)
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goto 9999
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endif
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ia = 1
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ja = 1
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m = psb_cd_get_global_rows(desc_a)
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n = psb_cd_get_global_cols(desc_a)
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nr = psb_cd_get_local_rows(desc_a)
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nc = psb_cd_get_local_cols(desc_a)
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call psb_chkmat(m,n,ia,ja,desc_a,info,iia,jja)
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if(info /= psb_success_) then
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info=psb_err_from_subroutine_
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ch_err='psb_chkmat'
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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 ((iia /= 1).or.(jja /= 1)) then
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info=psb_err_ix_n1_iy_n1_unsupported_
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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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call psb_geall(v,desc_a,info)
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if(info == psb_success_) then
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v = dzero
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call psb_geasb(v,desc_a,info)
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end if
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if(info /= psb_success_) then
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info=psb_err_from_subroutine_
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ch_err='geall/asb'
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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 ((m /= 0).and.(n /= 0)) then
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call a%aclsum(v,info)
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if (info == psb_success_) call psb_halo(v,desc_a,info,tran='T')
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if(info /= psb_success_) then
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info=psb_err_from_subroutine_
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ch_err='psb_halo'
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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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nrm1 = maxval(v(1:nr))
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else
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nrm1 = 0.d0
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end if
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! compute global max
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call psb_amx(ictxt, nrm1)
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psb_dspnrm1 = nrm1
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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(ictxt)
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return
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end if
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return
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end function psb_dspnrm1
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