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psblas3/base/psblas/psb_dspnrm1.f90

144 lines
4.5 KiB
Fortran

!!$
!!$ Parallel Sparse BLAS version 3.0
!!$ (C) Copyright 2006, 2007, 2008, 2009, 2010
!!$ Salvatore Filippone University of Rome Tor Vergata
!!$ Alfredo Buttari CNRS-IRIT, Toulouse
!!$
!!$ Redistribution and use in source and binary forms, with or without
!!$ modification, are permitted provided that the following conditions
!!$ are met:
!!$ 1. Redistributions of source code must retain the above copyright
!!$ notice, this list of conditions and the following disclaimer.
!!$ 2. Redistributions in binary form must reproduce the above copyright
!!$ notice, this list of conditions, and the following disclaimer in the
!!$ documentation and/or other materials provided with the distribution.
!!$ 3. The name of the PSBLAS group or the names of its contributors may
!!$ not be used to endorse or promote products derived from this
!!$ software without specific written permission.
!!$
!!$ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
!!$ ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
!!$ TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
!!$ PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PSBLAS GROUP OR ITS CONTRIBUTORS
!!$ BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
!!$ CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
!!$ SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
!!$ INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
!!$ CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
!!$ ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
!!$ POSSIBILITY OF SUCH DAMAGE.
!!$
!!$
! File: psb_dnrmi.f90
!
! Function: psb_dnrmi
! Forms the approximated norm of a sparse matrix,
!
! norm1 := max(sum(abs(A(:,j))))
!
! Arguments:
! a - type(psb_dspmat_type). The sparse matrix containing A.
! desc_a - type(psb_desc_type). The communication descriptor.
! info - integer. Return code
!
function psb_dspnrm1(a,desc_a,info)
!!$ use psb_descriptor_type
!!$ use psb_serial_mod
!!$ use psb_check_mod
!!$ use psb_error_mod
!!$ use psb_penv_mod
!!$ use psb_mat_mod
!!$ use psb_tools_mod
use psb_base_mod, psb_protect_name => psb_dspnrm1
implicit none
type(psb_dspmat_type), intent(in) :: a
integer, intent(out) :: info
type(psb_desc_type), intent(in) :: desc_a
real(psb_dpk_) :: psb_dspnrm1
! locals
integer :: ictxt, np, me, nr,nc,&
& err_act, n, iia, jja, ia, ja, mdim, ndim, m
real(psb_dpk_) :: nrm1
character(len=20) :: name, ch_err
real(psb_dpk_), allocatable :: v(:)
name='psb_dnrm1'
if(psb_get_errstatus() /= 0) return
info=psb_success_
call psb_erractionsave(err_act)
ictxt=psb_cd_get_context(desc_a)
call psb_info(ictxt, me, np)
if (np == -1) then
info = psb_err_context_error_
call psb_errpush(info,name)
goto 9999
endif
ia = 1
ja = 1
m = psb_cd_get_global_rows(desc_a)
n = psb_cd_get_global_cols(desc_a)
nr = psb_cd_get_local_rows(desc_a)
nc = psb_cd_get_local_cols(desc_a)
call psb_chkmat(m,n,ia,ja,desc_a,info,iia,jja)
if(info /= psb_success_) then
info=psb_err_from_subroutine_
ch_err='psb_chkmat'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
if ((iia /= 1).or.(jja /= 1)) then
info=psb_err_ix_n1_iy_n1_unsupported_
call psb_errpush(info,name)
goto 9999
end if
call psb_geall(v,desc_a,info)
if(info == psb_success_) then
v = dzero
call psb_geasb(v,desc_a,info)
end if
if(info /= psb_success_) then
info=psb_err_from_subroutine_
ch_err='geall/asb'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
if ((m /= 0).and.(n /= 0)) then
call a%aclsum(v,info)
if (info == psb_success_) call psb_halo(v,desc_a,info,tran='T')
if(info /= psb_success_) then
info=psb_err_from_subroutine_
ch_err='psb_halo'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
nrm1 = maxval(v(1:nr))
else
nrm1 = 0.d0
end if
! compute global max
call psb_amx(ictxt, nrm1)
psb_dspnrm1 = nrm1
call psb_erractionrestore(err_act)
return
9999 continue
call psb_erractionrestore(err_act)
if (err_act == psb_act_abort_) then
call psb_error(ictxt)
return
end if
return
end function psb_dspnrm1