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psblas3/base/psblas/psb_cnrmi.f90

125 lines
4.0 KiB
Fortran

!
! Parallel Sparse BLAS version 3.5
! (C) Copyright 2006-2018
! Salvatore Filippone
! Alfredo Buttari
!
! 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_cnrmi.f90
!
! Function: psb_cnrmi
! Computes the infinity norm of a sparse matrix,
!
! nrmi := max_i(sum(abs(A(i,:))))
!
! Arguments:
! a - type(psb_cspmat_type). The sparse matrix containing A.
! desc_a - type(psb_desc_type). The communication descriptor.
! info - integer. Return code
! global - logical(optional) Whether to perform the global reduction, default: .true.
!
function psb_cnrmi(a,desc_a,info,global) result(res)
use psb_base_mod, psb_protect_name => psb_cnrmi
implicit none
type(psb_cspmat_type), intent(in) :: a
integer(psb_ipk_), intent(out) :: info
type(psb_desc_type), intent(in) :: desc_a
real(psb_spk_) :: res
logical, intent(in), optional :: global
! locals
integer(psb_ipk_) :: ictxt, np, me,&
& err_act, iia, jja, mdim, ndim
integer(psb_lpk_) :: m, n, ia, ja
logical :: global_
character(len=20) :: name, ch_err
name='psb_cnrmi'
info=psb_success_
call psb_erractionsave(err_act)
if (psb_errstatus_fatal()) then
info = psb_err_internal_error_ ; goto 9999
end if
ictxt=desc_a%get_context()
call psb_info(ictxt, me, np)
if (np == -1) then
info = psb_err_context_error_
call psb_errpush(info,name)
goto 9999
endif
if (present(global)) then
global_ = global
else
global_ = .true.
end if
ia = 1
ja = 1
m = desc_a%get_global_rows()
n = desc_a%get_global_cols()
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
if ((m /= 0).and.(n /= 0)) then
res = a%spnmi()
if(info /= psb_success_) then
info=psb_err_from_subroutine_
ch_err='psb_cnrmi'
call psb_errpush(info,name,a_err=ch_err)
goto 9999
end if
else
res = szero
end if
! compute global max
if (global_) call psb_amx(ictxt, res)
call psb_erractionrestore(err_act)
return
9999 call psb_error_handler(ictxt,err_act)
return
end function psb_cnrmi